/*
 *  Linux syscalls
 *
 *  Copyright (c) 2003 Fabrice Bellard
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
 */
#define _ATFILE_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <elf.h>
#include <endian.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <limits.h>
#include <grp.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <sys/file.h>
#include <sys/fsuid.h>
#include <sys/personality.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/mman.h>
#include <sys/swap.h>
#include <signal.h>
#include <sched.h>
#ifdef __ia64__
int __clone2(int (*fn)(void *), void *child_stack_base,
             size_t stack_size, int flags, void *arg, ...);
#endif
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/uio.h>
#include <sys/poll.h>
#include <sys/times.h>
#include <sys/shm.h>
#include <sys/sem.h>
#include <sys/statfs.h>
#include <utime.h>
#include <sys/sysinfo.h>
#include <sys/utsname.h>
//#include <sys/user.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <linux/wireless.h>
#include <linux/icmp.h>
#include "qemu-common.h"
#ifdef TARGET_GPROF
#include <sys/gmon.h>
#endif
#ifdef CONFIG_EVENTFD
#include <sys/eventfd.h>
#endif
#ifdef CONFIG_EPOLL
#include <sys/epoll.h>
#endif
#ifdef CONFIG_ATTR
#include "qemu/xattr.h"
#endif
#ifdef CONFIG_SENDFILE
#include <sys/sendfile.h>
#endif

#define termios host_termios
#define winsize host_winsize
#define termio host_termio
#define sgttyb host_sgttyb /* same as target */
#define tchars host_tchars /* same as target */
#define ltchars host_ltchars /* same as target */

#include <linux/termios.h>
#include <linux/unistd.h>
#include <linux/utsname.h>
#include <linux/cdrom.h>
#include <linux/hdreg.h>
#include <linux/soundcard.h>
#include <linux/kd.h>
#include <linux/mtio.h>
#include <linux/fs.h>
#if defined(CONFIG_FIEMAP)
#include <linux/fiemap.h>
#endif
#include <linux/fb.h>
#include <linux/vt.h>
#include <linux/dm-ioctl.h>
#include <linux/reboot.h>
#include <linux/route.h>
#include <linux/filter.h>
#include "linux_loop.h"
#include "cpu-uname.h"

#include "qemu.h"

#define CLONE_NPTL_FLAGS2 (CLONE_SETTLS | \
    CLONE_PARENT_SETTID | CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)

//#define DEBUG

//#include <linux/msdos_fs.h>
#define VFAT_IOCTL_READDIR_BOTH         _IOR('r', 1, struct linux_dirent [2])
#define VFAT_IOCTL_READDIR_SHORT        _IOR('r', 2, struct linux_dirent [2])


#undef _syscall0
#undef _syscall1
#undef _syscall2
#undef _syscall3
#undef _syscall4
#undef _syscall5
#undef _syscall6

#define _syscall0(type,name)            \
static type name (void)                 \
{                                       \
        return syscall(__NR_##name);    \
}

#define _syscall1(type,name,type1,arg1)         \
static type name (type1 arg1)                   \
{                                               \
        return syscall(__NR_##name, arg1);      \
}

#define _syscall2(type,name,type1,arg1,type2,arg2)      \
static type name (type1 arg1,type2 arg2)                \
{                                                       \
        return syscall(__NR_##name, arg1, arg2);        \
}

#define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3)   \
static type name (type1 arg1,type2 arg2,type3 arg3)             \
{                                                               \
        return syscall(__NR_##name, arg1, arg2, arg3);          \
}

#define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4)        \
static type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4)                  \
{                                                                               \
        return syscall(__NR_##name, arg1, arg2, arg3, arg4);                    \
}

#define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,        \
                  type5,arg5)                                                   \
static type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5)       \
{                                                                               \
        return syscall(__NR_##name, arg1, arg2, arg3, arg4, arg5);              \
}


#define _syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,        \
                  type5,arg5,type6,arg6)                                        \
static type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5,       \
                  type6 arg6)                                                   \
{                                                                               \
        return syscall(__NR_##name, arg1, arg2, arg3, arg4, arg5, arg6);        \
}


#define __NR_sys_uname __NR_uname
#define __NR_sys_getcwd1 __NR_getcwd
#define __NR_sys_getdents __NR_getdents
#define __NR_sys_getdents64 __NR_getdents64
#define __NR_sys_getpriority __NR_getpriority
#define __NR_sys_rt_sigqueueinfo __NR_rt_sigqueueinfo
#define __NR_sys_syslog __NR_syslog
#define __NR_sys_tgkill __NR_tgkill
#define __NR_sys_tkill __NR_tkill
#define __NR_sys_futex __NR_futex
#define __NR_sys_inotify_init __NR_inotify_init
#define __NR_sys_inotify_add_watch __NR_inotify_add_watch
#define __NR_sys_inotify_rm_watch __NR_inotify_rm_watch

#if defined(__alpha__) || defined (__ia64__) || defined(__x86_64__) || \
    defined(__s390x__)
#define __NR__llseek __NR_lseek
#endif

#ifdef __NR_gettid
_syscall0(int, gettid)
#else
/* This is a replacement for the host gettid() and must return a host
   errno. */
static int gettid(void) {
    return -ENOSYS;
}
#endif
#ifdef __NR_getdents
_syscall3(int, sys_getdents, uint, fd, struct linux_dirent *, dirp, uint, count);
#endif
#if !defined(__NR_getdents) || \
    (defined(TARGET_NR_getdents64) && defined(__NR_getdents64))
_syscall3(int, sys_getdents64, uint, fd, struct linux_dirent64 *, dirp, uint, count);
#endif
#if defined(TARGET_NR__llseek) && defined(__NR_llseek)
_syscall5(int, _llseek,  uint,  fd, ulong, hi, ulong, lo,
          loff_t *, res, uint, wh);
#endif
_syscall3(int,sys_rt_sigqueueinfo,int,pid,int,sig,siginfo_t *,uinfo)
_syscall3(int,sys_syslog,int,type,char*,bufp,int,len)
#if defined(TARGET_NR_tgkill) && defined(__NR_tgkill)
_syscall3(int,sys_tgkill,int,tgid,int,pid,int,sig)
#endif
#if defined(TARGET_NR_tkill) && defined(__NR_tkill)
_syscall2(int,sys_tkill,int,tid,int,sig)
#endif
#ifdef __NR_exit_group
_syscall1(int,exit_group,int,error_code)
#endif
#if defined(TARGET_NR_set_tid_address) && defined(__NR_set_tid_address)
_syscall1(int,set_tid_address,int *,tidptr)
#endif
#if defined(TARGET_NR_futex) && defined(__NR_futex)
_syscall6(int,sys_futex,int *,uaddr,int,op,int,val,
          const struct timespec *,timeout,int *,uaddr2,int,val3)
#endif
#define __NR_sys_sched_getaffinity __NR_sched_getaffinity
_syscall3(int, sys_sched_getaffinity, pid_t, pid, unsigned int, len,
          unsigned long *, user_mask_ptr);
#define __NR_sys_sched_setaffinity __NR_sched_setaffinity
_syscall3(int, sys_sched_setaffinity, pid_t, pid, unsigned int, len,
          unsigned long *, user_mask_ptr);
_syscall4(int, reboot, int, magic1, int, magic2, unsigned int, cmd,
          void *, arg);

static bitmask_transtbl fcntl_flags_tbl[] = {
  { TARGET_O_ACCMODE,   TARGET_O_WRONLY,    O_ACCMODE,   O_WRONLY,    },
  { TARGET_O_ACCMODE,   TARGET_O_RDWR,      O_ACCMODE,   O_RDWR,      },
  { TARGET_O_CREAT,     TARGET_O_CREAT,     O_CREAT,     O_CREAT,     },
  { TARGET_O_EXCL,      TARGET_O_EXCL,      O_EXCL,      O_EXCL,      },
  { TARGET_O_NOCTTY,    TARGET_O_NOCTTY,    O_NOCTTY,    O_NOCTTY,    },
  { TARGET_O_TRUNC,     TARGET_O_TRUNC,     O_TRUNC,     O_TRUNC,     },
  { TARGET_O_APPEND,    TARGET_O_APPEND,    O_APPEND,    O_APPEND,    },
  { TARGET_O_NONBLOCK,  TARGET_O_NONBLOCK,  O_NONBLOCK,  O_NONBLOCK,  },
  { TARGET_O_SYNC,      TARGET_O_DSYNC,     O_SYNC,      O_DSYNC,     },
  { TARGET_O_SYNC,      TARGET_O_SYNC,      O_SYNC,      O_SYNC,      },
  { TARGET_FASYNC,      TARGET_FASYNC,      FASYNC,      FASYNC,      },
  { TARGET_O_DIRECTORY, TARGET_O_DIRECTORY, O_DIRECTORY, O_DIRECTORY, },
  { TARGET_O_NOFOLLOW,  TARGET_O_NOFOLLOW,  O_NOFOLLOW,  O_NOFOLLOW,  },
#if defined(O_DIRECT)
  { TARGET_O_DIRECT,    TARGET_O_DIRECT,    O_DIRECT,    O_DIRECT,    },
#endif
#if defined(O_NOATIME)
  { TARGET_O_NOATIME,   TARGET_O_NOATIME,   O_NOATIME,   O_NOATIME    },
#endif
#if defined(O_CLOEXEC)
  { TARGET_O_CLOEXEC,   TARGET_O_CLOEXEC,   O_CLOEXEC,   O_CLOEXEC    },
#endif
#if defined(O_PATH)
  { TARGET_O_PATH,      TARGET_O_PATH,      O_PATH,      O_PATH       },
#endif
  /* Don't terminate the list prematurely on 64-bit host+guest.  */
#if TARGET_O_LARGEFILE != 0 || O_LARGEFILE != 0
  { TARGET_O_LARGEFILE, TARGET_O_LARGEFILE, O_LARGEFILE, O_LARGEFILE, },
#endif
  { 0, 0, 0, 0 }
};

#define COPY_UTSNAME_FIELD(dest, src) \
  do { \
      /* __NEW_UTS_LEN doesn't include terminating null */ \
      (void) strncpy((dest), (src), __NEW_UTS_LEN); \
      (dest)[__NEW_UTS_LEN] = '\0'; \
  } while (0)

static int sys_uname(struct new_utsname *buf)
{
  struct utsname uts_buf;

  if (uname(&uts_buf) < 0)
      return (-1);

  /*
   * Just in case these have some differences, we
   * translate utsname to new_utsname (which is the
   * struct linux kernel uses).
   */

  memset(buf, 0, sizeof(*buf));
  COPY_UTSNAME_FIELD(buf->sysname, uts_buf.sysname);
  COPY_UTSNAME_FIELD(buf->nodename, uts_buf.nodename);
  COPY_UTSNAME_FIELD(buf->release, uts_buf.release);
  COPY_UTSNAME_FIELD(buf->version, uts_buf.version);
  COPY_UTSNAME_FIELD(buf->machine, uts_buf.machine);
#ifdef _GNU_SOURCE
  COPY_UTSNAME_FIELD(buf->domainname, uts_buf.domainname);
#endif
  return (0);

#undef COPY_UTSNAME_FIELD
}

static int sys_getcwd1(char *buf, size_t size)
{
  if (getcwd(buf, size) == NULL) {
      /* getcwd() sets errno */
      return (-1);
  }
  return strlen(buf)+1;
}

#ifdef TARGET_NR_openat
static int sys_openat(int dirfd, const char *pathname, int flags, mode_t mode)
{
  /*
   * open(2) has extra parameter 'mode' when called with
   * flag O_CREAT.
   */
  if ((flags & O_CREAT) != 0) {
      return (openat(dirfd, pathname, flags, mode));
  }
  return (openat(dirfd, pathname, flags));
}
#endif

#ifdef TARGET_NR_utimensat
#ifdef CONFIG_UTIMENSAT
static int sys_utimensat(int dirfd, const char *pathname,
    const struct timespec times[2], int flags)
{
    if (pathname == NULL)
        return futimens(dirfd, times);
    else
        return utimensat(dirfd, pathname, times, flags);
}
#elif defined(__NR_utimensat)
#define __NR_sys_utimensat __NR_utimensat
_syscall4(int,sys_utimensat,int,dirfd,const char *,pathname,
          const struct timespec *,tsp,int,flags)
#else
static int sys_utimensat(int dirfd, const char *pathname,
                         const struct timespec times[2], int flags)
{
    errno = ENOSYS;
    return -1;
}
#endif
#endif /* TARGET_NR_utimensat */

#ifdef CONFIG_INOTIFY
#include <sys/inotify.h>

#if defined(TARGET_NR_inotify_init) && defined(__NR_inotify_init)
static int sys_inotify_init(void)
{
  return (inotify_init());
}
#endif
#if defined(TARGET_NR_inotify_add_watch) && defined(__NR_inotify_add_watch)
static int sys_inotify_add_watch(int fd,const char *pathname, int32_t mask)
{
  return (inotify_add_watch(fd, pathname, mask));
}
#endif
#if defined(TARGET_NR_inotify_rm_watch) && defined(__NR_inotify_rm_watch)
static int sys_inotify_rm_watch(int fd, int32_t wd)
{
  return (inotify_rm_watch(fd, wd));
}
#endif
#ifdef CONFIG_INOTIFY1
#if defined(TARGET_NR_inotify_init1) && defined(__NR_inotify_init1)
static int sys_inotify_init1(int flags)
{
  return (inotify_init1(flags));
}
#endif
#endif
#else
/* Userspace can usually survive runtime without inotify */
#undef TARGET_NR_inotify_init
#undef TARGET_NR_inotify_init1
#undef TARGET_NR_inotify_add_watch
#undef TARGET_NR_inotify_rm_watch
#endif /* CONFIG_INOTIFY  */

#if defined(TARGET_NR_ppoll)
#ifndef __NR_ppoll
# define __NR_ppoll -1
#endif
#define __NR_sys_ppoll __NR_ppoll
_syscall5(int, sys_ppoll, struct pollfd *, fds, nfds_t, nfds,
          struct timespec *, timeout, const __sigset_t *, sigmask,
          size_t, sigsetsize)
#endif

#if defined(TARGET_NR_pselect6)
#ifndef __NR_pselect6
# define __NR_pselect6 -1
#endif
#define __NR_sys_pselect6 __NR_pselect6
_syscall6(int, sys_pselect6, int, nfds, fd_set *, readfds, fd_set *, writefds,
          fd_set *, exceptfds, struct timespec *, timeout, void *, sig);
#endif

#if defined(TARGET_NR_prlimit64)
#ifndef __NR_prlimit64
# define __NR_prlimit64 -1
#endif
#define __NR_sys_prlimit64 __NR_prlimit64
/* The glibc rlimit structure may not be that used by the underlying syscall */
struct host_rlimit64 {
    uint64_t rlim_cur;
    uint64_t rlim_max;
};
_syscall4(int, sys_prlimit64, pid_t, pid, int, resource,
          const struct host_rlimit64 *, new_limit,
          struct host_rlimit64 *, old_limit)
#endif

/* ARM EABI and MIPS expect 64bit types aligned even on pairs or registers */
#ifdef TARGET_ARM
static inline int regpairs_aligned(void *cpu_env) {
    return ((((CPUARMState *)cpu_env)->eabi) == 1) ;
}
#elif defined(TARGET_MIPS)
static inline int regpairs_aligned(void *cpu_env) { return 1; }
#elif defined(TARGET_PPC) && !defined(TARGET_PPC64)
/* SysV AVI for PPC32 expects 64bit parameters to be passed on odd/even pairs
 * of registers which translates to the same as ARM/MIPS, because we start with
 * r3 as arg1 */
static inline int regpairs_aligned(void *cpu_env) { return 1; }
#else
static inline int regpairs_aligned(void *cpu_env) { return 0; }
#endif

#define ERRNO_TABLE_SIZE 1200

/* target_to_host_errno_table[] is initialized from
 * host_to_target_errno_table[] in syscall_init(). */
static uint16_t target_to_host_errno_table[ERRNO_TABLE_SIZE] = {
};

/*
 * This list is the union of errno values overridden in asm-<arch>/errno.h
 * minus the errnos that are not actually generic to all archs.
 */
static uint16_t host_to_target_errno_table[ERRNO_TABLE_SIZE] = {
    [EIDRM]             = TARGET_EIDRM,
    [ECHRNG]            = TARGET_ECHRNG,
    [EL2NSYNC]          = TARGET_EL2NSYNC,
    [EL3HLT]            = TARGET_EL3HLT,
    [EL3RST]            = TARGET_EL3RST,
    [ELNRNG]            = TARGET_ELNRNG,
    [EUNATCH]           = TARGET_EUNATCH,
    [ENOCSI]            = TARGET_ENOCSI,
    [EL2HLT]            = TARGET_EL2HLT,
    [EDEADLK]           = TARGET_EDEADLK,
    [ENOLCK]            = TARGET_ENOLCK,
    [EBADE]             = TARGET_EBADE,
    [EBADR]             = TARGET_EBADR,
    [EXFULL]            = TARGET_EXFULL,
    [ENOANO]            = TARGET_ENOANO,
    [EBADRQC]           = TARGET_EBADRQC,
    [EBADSLT]           = TARGET_EBADSLT,
    [EBFONT]            = TARGET_EBFONT,
    [ENOSTR]            = TARGET_ENOSTR,
    [ENODATA]           = TARGET_ENODATA,
    [ETIME]             = TARGET_ETIME,
    [ENOSR]             = TARGET_ENOSR,
    [ENONET]            = TARGET_ENONET,
    [ENOPKG]            = TARGET_ENOPKG,
    [EREMOTE]           = TARGET_EREMOTE,
    [ENOLINK]           = TARGET_ENOLINK,
    [EADV]              = TARGET_EADV,
    [ESRMNT]            = TARGET_ESRMNT,
    [ECOMM]             = TARGET_ECOMM,
    [EPROTO]            = TARGET_EPROTO,
    [EDOTDOT]           = TARGET_EDOTDOT,
    [EMULTIHOP]         = TARGET_EMULTIHOP,
    [EBADMSG]           = TARGET_EBADMSG,
    [ENAMETOOLONG]      = TARGET_ENAMETOOLONG,
    [EOVERFLOW]         = TARGET_EOVERFLOW,
    [ENOTUNIQ]          = TARGET_ENOTUNIQ,
    [EBADFD]            = TARGET_EBADFD,
    [EREMCHG]           = TARGET_EREMCHG,
    [ELIBACC]           = TARGET_ELIBACC,
    [ELIBBAD]           = TARGET_ELIBBAD,
    [ELIBSCN]           = TARGET_ELIBSCN,
    [ELIBMAX]           = TARGET_ELIBMAX,
    [ELIBEXEC]          = TARGET_ELIBEXEC,
    [EILSEQ]            = TARGET_EILSEQ,
    [ENOSYS]            = TARGET_ENOSYS,
    [ELOOP]             = TARGET_ELOOP,
    [ERESTART]          = TARGET_ERESTART,
    [ESTRPIPE]          = TARGET_ESTRPIPE,
    [ENOTEMPTY]         = TARGET_ENOTEMPTY,
    [EUSERS]            = TARGET_EUSERS,
    [ENOTSOCK]          = TARGET_ENOTSOCK,
    [EDESTADDRREQ]      = TARGET_EDESTADDRREQ,
    [EMSGSIZE]          = TARGET_EMSGSIZE,
    [EPROTOTYPE]        = TARGET_EPROTOTYPE,
    [ENOPROTOOPT]       = TARGET_ENOPROTOOPT,
    [EPROTONOSUPPORT]   = TARGET_EPROTONOSUPPORT,
    [ESOCKTNOSUPPORT]   = TARGET_ESOCKTNOSUPPORT,
    [EOPNOTSUPP]        = TARGET_EOPNOTSUPP,
    [EPFNOSUPPORT]      = TARGET_EPFNOSUPPORT,
    [EAFNOSUPPORT]      = TARGET_EAFNOSUPPORT,
    [EADDRINUSE]        = TARGET_EADDRINUSE,
    [EADDRNOTAVAIL]     = TARGET_EADDRNOTAVAIL,
    [ENETDOWN]          = TARGET_ENETDOWN,
    [ENETUNREACH]       = TARGET_ENETUNREACH,
    [ENETRESET]         = TARGET_ENETRESET,
    [ECONNABORTED]      = TARGET_ECONNABORTED,
    [ECONNRESET]        = TARGET_ECONNRESET,
    [ENOBUFS]           = TARGET_ENOBUFS,
    [EISCONN]           = TARGET_EISCONN,
    [ENOTCONN]          = TARGET_ENOTCONN,
    [EUCLEAN]           = TARGET_EUCLEAN,
    [ENOTNAM]           = TARGET_ENOTNAM,
    [ENAVAIL]           = TARGET_ENAVAIL,
    [EISNAM]            = TARGET_EISNAM,
    [EREMOTEIO]         = TARGET_EREMOTEIO,
    [ESHUTDOWN]         = TARGET_ESHUTDOWN,
    [ETOOMANYREFS]      = TARGET_ETOOMANYREFS,
    [ETIMEDOUT]         = TARGET_ETIMEDOUT,
    [ECONNREFUSED]      = TARGET_ECONNREFUSED,
    [EHOSTDOWN]         = TARGET_EHOSTDOWN,
    [EHOSTUNREACH]      = TARGET_EHOSTUNREACH,
    [EALREADY]          = TARGET_EALREADY,
    [EINPROGRESS]       = TARGET_EINPROGRESS,
    [ESTALE]            = TARGET_ESTALE,
    [ECANCELED]         = TARGET_ECANCELED,
    [ENOMEDIUM]         = TARGET_ENOMEDIUM,
    [EMEDIUMTYPE]       = TARGET_EMEDIUMTYPE,
#ifdef ENOKEY
    [ENOKEY]            = TARGET_ENOKEY,
#endif
#ifdef EKEYEXPIRED
    [EKEYEXPIRED]       = TARGET_EKEYEXPIRED,
#endif
#ifdef EKEYREVOKED
    [EKEYREVOKED]       = TARGET_EKEYREVOKED,
#endif
#ifdef EKEYREJECTED
    [EKEYREJECTED]      = TARGET_EKEYREJECTED,
#endif
#ifdef EOWNERDEAD
    [EOWNERDEAD]        = TARGET_EOWNERDEAD,
#endif
#ifdef ENOTRECOVERABLE
    [ENOTRECOVERABLE]   = TARGET_ENOTRECOVERABLE,
#endif
};

static inline int host_to_target_errno(int err)
{
    if(host_to_target_errno_table[err])
        return host_to_target_errno_table[err];
    return err;
}

static inline int target_to_host_errno(int err)
{
    if (target_to_host_errno_table[err])
        return target_to_host_errno_table[err];
    return err;
}

static inline abi_long get_errno(abi_long ret)
{
    if (ret == -1)
        return -host_to_target_errno(errno);
    else
        return ret;
}

static inline int is_error(abi_long ret)
{
    return (abi_ulong)ret >= (abi_ulong)(-4096);
}

char *target_strerror(int err)
{
    if ((err >= ERRNO_TABLE_SIZE) || (err < 0)) {
        return NULL;
    }
    return strerror(target_to_host_errno(err));
}

static abi_ulong target_brk;
static abi_ulong target_original_brk;
static abi_ulong brk_page;

void target_set_brk(abi_ulong new_brk)
{
    target_original_brk = target_brk = HOST_PAGE_ALIGN(new_brk);
    brk_page = HOST_PAGE_ALIGN(target_brk);
}

//#define DEBUGF_BRK(message, args...) do { fprintf(stderr, (message), ## args); } while (0)
#define DEBUGF_BRK(message, args...)

/* do_brk() must return target values and target errnos. */
abi_long do_brk(abi_ulong new_brk)
{
    abi_long mapped_addr;
    int new_alloc_size;

    DEBUGF_BRK("do_brk(" TARGET_ABI_FMT_lx ") -> ", new_brk);

    if (!new_brk) {
        DEBUGF_BRK(TARGET_ABI_FMT_lx " (!new_brk)\n", target_brk);
        return target_brk;
    }
    if (new_brk < target_original_brk) {
        DEBUGF_BRK(TARGET_ABI_FMT_lx " (new_brk < target_original_brk)\n",
                   target_brk);
        return target_brk;
    }

    /* If the new brk is less than the highest page reserved to the
     * target heap allocation, set it and we're almost done...  */
    if (new_brk <= brk_page) {
        /* Heap contents are initialized to zero, as for anonymous
         * mapped pages.  */
        if (new_brk > target_brk) {
            memset(g2h(target_brk), 0, new_brk - target_brk);
        }
        target_brk = new_brk;
        DEBUGF_BRK(TARGET_ABI_FMT_lx " (new_brk <= brk_page)\n", target_brk);
        return target_brk;
    }

    /* We need to allocate more memory after the brk... Note that
     * we don't use MAP_FIXED because that will map over the top of
     * any existing mapping (like the one with the host libc or qemu
     * itself); instead we treat "mapped but at wrong address" as
     * a failure and unmap again.
     */
    new_alloc_size = HOST_PAGE_ALIGN(new_brk - brk_page);
    mapped_addr = get_errno(target_mmap(brk_page, new_alloc_size,
                                        PROT_READ|PROT_WRITE,
                                        MAP_ANON|MAP_PRIVATE, 0, 0));

    if (mapped_addr == brk_page) {
        /* Heap contents are initialized to zero, as for anonymous
         * mapped pages.  Technically the new pages are already
         * initialized to zero since they *are* anonymous mapped
         * pages, however we have to take care with the contents that
         * come from the remaining part of the previous page: it may
         * contains garbage data due to a previous heap usage (grown
         * then shrunken).  */
        memset(g2h(target_brk), 0, brk_page - target_brk);

        target_brk = new_brk;
        brk_page = HOST_PAGE_ALIGN(target_brk);
        DEBUGF_BRK(TARGET_ABI_FMT_lx " (mapped_addr == brk_page)\n",
            target_brk);
        return target_brk;
    } else if (mapped_addr != -1) {
        /* Mapped but at wrong address, meaning there wasn't actually
         * enough space for this brk.
         */
        target_munmap(mapped_addr, new_alloc_size);
        mapped_addr = -1;
        DEBUGF_BRK(TARGET_ABI_FMT_lx " (mapped_addr != -1)\n", target_brk);
    }
    else {
        DEBUGF_BRK(TARGET_ABI_FMT_lx " (otherwise)\n", target_brk);
    }

#if defined(TARGET_ALPHA)
    /* We (partially) emulate OSF/1 on Alpha, which requires we
       return a proper errno, not an unchanged brk value.  */
    return -TARGET_ENOMEM;
#endif
    /* For everything else, return the previous break. */
    return target_brk;
}

static inline abi_long copy_from_user_fdset(fd_set *fds,
                                            abi_ulong target_fds_addr,
                                            int n)
{
    int i, nw, j, k;
    abi_ulong b, *target_fds;

    nw = (n + TARGET_ABI_BITS - 1) / TARGET_ABI_BITS;
    if (!(target_fds = lock_user(VERIFY_READ,
                                 target_fds_addr,
                                 sizeof(abi_ulong) * nw,
                                 1)))
        return -TARGET_EFAULT;

    FD_ZERO(fds);
    k = 0;
    for (i = 0; i < nw; i++) {
        /* grab the abi_ulong */
        __get_user(b, &target_fds[i]);
        for (j = 0; j < TARGET_ABI_BITS; j++) {
            /* check the bit inside the abi_ulong */
            if ((b >> j) & 1)
                FD_SET(k, fds);
            k++;
        }
    }

    unlock_user(target_fds, target_fds_addr, 0);

    return 0;
}

static inline abi_ulong copy_from_user_fdset_ptr(fd_set *fds, fd_set **fds_ptr,
                                                 abi_ulong target_fds_addr,
                                                 int n)
{
    if (target_fds_addr) {
        if (copy_from_user_fdset(fds, target_fds_addr, n))
            return -TARGET_EFAULT;
        *fds_ptr = fds;
    } else {
        *fds_ptr = NULL;
    }
    return 0;
}

static inline abi_long copy_to_user_fdset(abi_ulong target_fds_addr,
                                          const fd_set *fds,
                                          int n)
{
    int i, nw, j, k;
    abi_long v;
    abi_ulong *target_fds;

    nw = (n + TARGET_ABI_BITS - 1) / TARGET_ABI_BITS;
    if (!(target_fds = lock_user(VERIFY_WRITE,
                                 target_fds_addr,
                                 sizeof(abi_ulong) * nw,
                                 0)))
        return -TARGET_EFAULT;

    k = 0;
    for (i = 0; i < nw; i++) {
        v = 0;
        for (j = 0; j < TARGET_ABI_BITS; j++) {
            v |= ((abi_ulong)(FD_ISSET(k, fds) != 0) << j);
            k++;
        }
        __put_user(v, &target_fds[i]);
    }

    unlock_user(target_fds, target_fds_addr, sizeof(abi_ulong) * nw);

    return 0;
}

#if defined(__alpha__)
#define HOST_HZ 1024
#else
#define HOST_HZ 100
#endif

static inline abi_long host_to_target_clock_t(long ticks)
{
#if HOST_HZ == TARGET_HZ
    return ticks;
#else
    return ((int64_t)ticks * TARGET_HZ) / HOST_HZ;
#endif
}

static inline abi_long host_to_target_rusage(abi_ulong target_addr,
                                             const struct rusage *rusage)
{
    struct target_rusage *target_rusage;

    if (!lock_user_struct(VERIFY_WRITE, target_rusage, target_addr, 0))
        return -TARGET_EFAULT;
    target_rusage->ru_utime.tv_sec = tswapal(rusage->ru_utime.tv_sec);
    target_rusage->ru_utime.tv_usec = tswapal(rusage->ru_utime.tv_usec);
    target_rusage->ru_stime.tv_sec = tswapal(rusage->ru_stime.tv_sec);
    target_rusage->ru_stime.tv_usec = tswapal(rusage->ru_stime.tv_usec);
    target_rusage->ru_maxrss = tswapal(rusage->ru_maxrss);
    target_rusage->ru_ixrss = tswapal(rusage->ru_ixrss);
    target_rusage->ru_idrss = tswapal(rusage->ru_idrss);
    target_rusage->ru_isrss = tswapal(rusage->ru_isrss);
    target_rusage->ru_minflt = tswapal(rusage->ru_minflt);
    target_rusage->ru_majflt = tswapal(rusage->ru_majflt);
    target_rusage->ru_nswap = tswapal(rusage->ru_nswap);
    target_rusage->ru_inblock = tswapal(rusage->ru_inblock);
    target_rusage->ru_oublock = tswapal(rusage->ru_oublock);
    target_rusage->ru_msgsnd = tswapal(rusage->ru_msgsnd);
    target_rusage->ru_msgrcv = tswapal(rusage->ru_msgrcv);
    target_rusage->ru_nsignals = tswapal(rusage->ru_nsignals);
    target_rusage->ru_nvcsw = tswapal(rusage->ru_nvcsw);
    target_rusage->ru_nivcsw = tswapal(rusage->ru_nivcsw);
    unlock_user_struct(target_rusage, target_addr, 1);

    return 0;
}

static inline rlim_t target_to_host_rlim(abi_ulong target_rlim)
{
    abi_ulong target_rlim_swap;
    rlim_t result;
    
    target_rlim_swap = tswapal(target_rlim);
    if (target_rlim_swap == TARGET_RLIM_INFINITY)
        return RLIM_INFINITY;

    result = target_rlim_swap;
    if (target_rlim_swap != (rlim_t)result)
        return RLIM_INFINITY;
    
    return result;
}

static inline abi_ulong host_to_target_rlim(rlim_t rlim)
{
    abi_ulong target_rlim_swap;
    abi_ulong result;
    
    if (rlim == RLIM_INFINITY || rlim != (abi_long)rlim)
        target_rlim_swap = TARGET_RLIM_INFINITY;
    else
        target_rlim_swap = rlim;
    result = tswapal(target_rlim_swap);
    
    return result;
}

static inline int target_to_host_resource(int code)
{
    switch (code) {
    case TARGET_RLIMIT_AS:
        return RLIMIT_AS;
    case TARGET_RLIMIT_CORE:
        return RLIMIT_CORE;
    case TARGET_RLIMIT_CPU:
        return RLIMIT_CPU;
    case TARGET_RLIMIT_DATA:
        return RLIMIT_DATA;
    case TARGET_RLIMIT_FSIZE:
        return RLIMIT_FSIZE;
    case TARGET_RLIMIT_LOCKS:
        return RLIMIT_LOCKS;
    case TARGET_RLIMIT_MEMLOCK:
        return RLIMIT_MEMLOCK;
    case TARGET_RLIMIT_MSGQUEUE:
        return RLIMIT_MSGQUEUE;
    case TARGET_RLIMIT_NICE:
        return RLIMIT_NICE;
    case TARGET_RLIMIT_NOFILE:
        return RLIMIT_NOFILE;
    case TARGET_RLIMIT_NPROC:
        return RLIMIT_NPROC;
    case TARGET_RLIMIT_RSS:
        return RLIMIT_RSS;
    case TARGET_RLIMIT_RTPRIO:
        return RLIMIT_RTPRIO;
    case TARGET_RLIMIT_SIGPENDING:
        return RLIMIT_SIGPENDING;
    case TARGET_RLIMIT_STACK:
        return RLIMIT_STACK;
    default:
        return code;
    }
}

static inline abi_long copy_from_user_timeval(struct timeval *tv,
                                              abi_ulong target_tv_addr)
{
    struct target_timeval *target_tv;

    if (!lock_user_struct(VERIFY_READ, target_tv, target_tv_addr, 1))
        return -TARGET_EFAULT;

    __get_user(tv->tv_sec, &target_tv->tv_sec);
    __get_user(tv->tv_usec, &target_tv->tv_usec);

    unlock_user_struct(target_tv, target_tv_addr, 0);

    return 0;
}

static inline abi_long copy_to_user_timeval(abi_ulong target_tv_addr,
                                            const struct timeval *tv)
{
    struct target_timeval *target_tv;

    if (!lock_user_struct(VERIFY_WRITE, target_tv, target_tv_addr, 0))
        return -TARGET_EFAULT;

    __put_user(tv->tv_sec, &target_tv->tv_sec);
    __put_user(tv->tv_usec, &target_tv->tv_usec);

    unlock_user_struct(target_tv, target_tv_addr, 1);

    return 0;
}

#if defined(TARGET_NR_mq_open) && defined(__NR_mq_open)
#include <mqueue.h>

static inline abi_long copy_from_user_mq_attr(struct mq_attr *attr,
                                              abi_ulong target_mq_attr_addr)
{
    struct target_mq_attr *target_mq_attr;

    if (!lock_user_struct(VERIFY_READ, target_mq_attr,
                          target_mq_attr_addr, 1))
        return -TARGET_EFAULT;

    __get_user(attr->mq_flags, &target_mq_attr->mq_flags);
    __get_user(attr->mq_maxmsg, &target_mq_attr->mq_maxmsg);
    __get_user(attr->mq_msgsize, &target_mq_attr->mq_msgsize);
    __get_user(attr->mq_curmsgs, &target_mq_attr->mq_curmsgs);

    unlock_user_struct(target_mq_attr, target_mq_attr_addr, 0);

    return 0;
}

static inline abi_long copy_to_user_mq_attr(abi_ulong target_mq_attr_addr,
                                            const struct mq_attr *attr)
{
    struct target_mq_attr *target_mq_attr;

    if (!lock_user_struct(VERIFY_WRITE, target_mq_attr,
                          target_mq_attr_addr, 0))
        return -TARGET_EFAULT;

    __put_user(attr->mq_flags, &target_mq_attr->mq_flags);
    __put_user(attr->mq_maxmsg, &target_mq_attr->mq_maxmsg);
    __put_user(attr->mq_msgsize, &target_mq_attr->mq_msgsize);
    __put_user(attr->mq_curmsgs, &target_mq_attr->mq_curmsgs);

    unlock_user_struct(target_mq_attr, target_mq_attr_addr, 1);

    return 0;
}
#endif

#if defined(TARGET_NR_select) || defined(TARGET_NR__newselect)
/* do_select() must return target values and target errnos. */
static abi_long do_select(int n,
                          abi_ulong rfd_addr, abi_ulong wfd_addr,
                          abi_ulong efd_addr, abi_ulong target_tv_addr)
{
    fd_set rfds, wfds, efds;
    fd_set *rfds_ptr, *wfds_ptr, *efds_ptr;
    struct timeval tv, *tv_ptr;
    abi_long ret;

    ret = copy_from_user_fdset_ptr(&rfds, &rfds_ptr, rfd_addr, n);
    if (ret) {
        return ret;
    }
    ret = copy_from_user_fdset_ptr(&wfds, &wfds_ptr, wfd_addr, n);
    if (ret) {
        return ret;
    }
    ret = copy_from_user_fdset_ptr(&efds, &efds_ptr, efd_addr, n);
    if (ret) {
        return ret;
    }

    if (target_tv_addr) {
        if (copy_from_user_timeval(&tv, target_tv_addr))
            return -TARGET_EFAULT;
        tv_ptr = &tv;
    } else {
        tv_ptr = NULL;
    }

    ret = get_errno(select(n, rfds_ptr, wfds_ptr, efds_ptr, tv_ptr));

    if (!is_error(ret)) {
        if (rfd_addr && copy_to_user_fdset(rfd_addr, &rfds, n))
            return -TARGET_EFAULT;
        if (wfd_addr && copy_to_user_fdset(wfd_addr, &wfds, n))
            return -TARGET_EFAULT;
        if (efd_addr && copy_to_user_fdset(efd_addr, &efds, n))
            return -TARGET_EFAULT;

        if (target_tv_addr && copy_to_user_timeval(target_tv_addr, &tv))
            return -TARGET_EFAULT;
    }

    return ret;
}
#endif

static abi_long do_pipe2(int host_pipe[], int flags)
{
#ifdef CONFIG_PIPE2
    return pipe2(host_pipe, flags);
#else
    return -ENOSYS;
#endif
}

static abi_long do_pipe(void *cpu_env, abi_ulong pipedes,
                        int flags, int is_pipe2)
{
    int host_pipe[2];
    abi_long ret;
    ret = flags ? do_pipe2(host_pipe, flags) : pipe(host_pipe);

    if (is_error(ret))
        return get_errno(ret);

    /* Several targets have special calling conventions for the original
       pipe syscall, but didn't replicate this into the pipe2 syscall.  */
    if (!is_pipe2) {
#if defined(TARGET_ALPHA)
        ((CPUAlphaState *)cpu_env)->ir[IR_A4] = host_pipe[1];
        return host_pipe[0];
#elif defined(TARGET_MIPS)
        ((CPUMIPSState*)cpu_env)->active_tc.gpr[3] = host_pipe[1];
        return host_pipe[0];
#elif defined(TARGET_SH4)
        ((CPUSH4State*)cpu_env)->gregs[1] = host_pipe[1];
        return host_pipe[0];
#elif defined(TARGET_SPARC)
        ((CPUSPARCState*)cpu_env)->regwptr[1] = host_pipe[1];
        return host_pipe[0];
#endif
    }

    if (put_user_s32(host_pipe[0], pipedes)
        || put_user_s32(host_pipe[1], pipedes + sizeof(host_pipe[0])))
        return -TARGET_EFAULT;
    return get_errno(ret);
}

static inline abi_long target_to_host_ip_mreq(struct ip_mreqn *mreqn,
                                              abi_ulong target_addr,
                                              socklen_t len)
{
    struct target_ip_mreqn *target_smreqn;

    target_smreqn = lock_user(VERIFY_READ, target_addr, len, 1);
    if (!target_smreqn)
        return -TARGET_EFAULT;
    mreqn->imr_multiaddr.s_addr = target_smreqn->imr_multiaddr.s_addr;
    mreqn->imr_address.s_addr = target_smreqn->imr_address.s_addr;
    if (len == sizeof(struct target_ip_mreqn))
        mreqn->imr_ifindex = tswapal(target_smreqn->imr_ifindex);
    unlock_user(target_smreqn, target_addr, 0);

    return 0;
}

static inline abi_long target_to_host_sockaddr(struct sockaddr *addr,
                                               abi_ulong target_addr,
                                               socklen_t len)
{
    const socklen_t unix_maxlen = sizeof (struct sockaddr_un);
    sa_family_t sa_family;
    struct target_sockaddr *target_saddr;

    target_saddr = lock_user(VERIFY_READ, target_addr, len, 1);
    if (!target_saddr)
        return -TARGET_EFAULT;

    sa_family = tswap16(target_saddr->sa_family);

    /* Oops. The caller might send a incomplete sun_path; sun_path
     * must be terminated by \0 (see the manual page), but
     * unfortunately it is quite common to specify sockaddr_un
     * length as "strlen(x->sun_path)" while it should be
     * "strlen(...) + 1". We'll fix that here if needed.
     * Linux kernel has a similar feature.
     */

    if (sa_family == AF_UNIX) {
        if (len < unix_maxlen && len > 0) {
            char *cp = (char*)target_saddr;

            if ( cp[len-1] && !cp[len] )
                len++;
        }
        if (len > unix_maxlen)
            len = unix_maxlen;
    }

    memcpy(addr, target_saddr, len);
    addr->sa_family = sa_family;
    unlock_user(target_saddr, target_addr, 0);

    return 0;
}

static inline abi_long host_to_target_sockaddr(abi_ulong target_addr,
                                               struct sockaddr *addr,
                                               socklen_t len)
{
    struct target_sockaddr *target_saddr;

    target_saddr = lock_user(VERIFY_WRITE, target_addr, len, 0);
    if (!target_saddr)
        return -TARGET_EFAULT;
    memcpy(target_saddr, addr, len);
    target_saddr->sa_family = tswap16(addr->sa_family);
    unlock_user(target_saddr, target_addr, len);

    return 0;
}

static inline abi_long target_to_host_cmsg(struct msghdr *msgh,
                                           struct target_msghdr *target_msgh)
{
    struct cmsghdr *cmsg = CMSG_FIRSTHDR(msgh);
    abi_long msg_controllen;
    abi_ulong target_cmsg_addr;
    struct target_cmsghdr *target_cmsg;
    socklen_t space = 0;
    
    msg_controllen = tswapal(target_msgh->msg_controllen);
    if (msg_controllen < sizeof (struct target_cmsghdr)) 
        goto the_end;
    target_cmsg_addr = tswapal(target_msgh->msg_control);
    target_cmsg = lock_user(VERIFY_READ, target_cmsg_addr, msg_controllen, 1);
    if (!target_cmsg)
        return -TARGET_EFAULT;

    while (cmsg && target_cmsg) {
        void *data = CMSG_DATA(cmsg);
        void *target_data = TARGET_CMSG_DATA(target_cmsg);

        int len = tswapal(target_cmsg->cmsg_len)
                  - TARGET_CMSG_ALIGN(sizeof (struct target_cmsghdr));

        space += CMSG_SPACE(len);
        if (space > msgh->msg_controllen) {
            space -= CMSG_SPACE(len);
            gemu_log("Host cmsg overflow\n");
            break;
        }

        if (tswap32(target_cmsg->cmsg_level) == TARGET_SOL_SOCKET) {
            cmsg->cmsg_level = SOL_SOCKET;
        } else {
            cmsg->cmsg_level = tswap32(target_cmsg->cmsg_level);
        }
        cmsg->cmsg_type = tswap32(target_cmsg->cmsg_type);
        cmsg->cmsg_len = CMSG_LEN(len);

        if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) {
            gemu_log("Unsupported ancillary data: %d/%d\n", cmsg->cmsg_level, cmsg->cmsg_type);
            memcpy(data, target_data, len);
        } else {
            int *fd = (int *)data;
            int *target_fd = (int *)target_data;
            int i, numfds = len / sizeof(int);

            for (i = 0; i < numfds; i++)
                fd[i] = tswap32(target_fd[i]);
        }

        cmsg = CMSG_NXTHDR(msgh, cmsg);
        target_cmsg = TARGET_CMSG_NXTHDR(target_msgh, target_cmsg);
    }
    unlock_user(target_cmsg, target_cmsg_addr, 0);
 the_end:
    msgh->msg_controllen = space;
    return 0;
}

static inline abi_long host_to_target_cmsg(struct target_msghdr *target_msgh,
                                           struct msghdr *msgh)
{
    struct cmsghdr *cmsg = CMSG_FIRSTHDR(msgh);
    abi_long msg_controllen;
    abi_ulong target_cmsg_addr;
    struct target_cmsghdr *target_cmsg;
    socklen_t space = 0;

    msg_controllen = tswapal(target_msgh->msg_controllen);
    if (msg_controllen < sizeof (struct target_cmsghdr)) 
        goto the_end;
    target_cmsg_addr = tswapal(target_msgh->msg_control);
    target_cmsg = lock_user(VERIFY_WRITE, target_cmsg_addr, msg_controllen, 0);
    if (!target_cmsg)
        return -TARGET_EFAULT;

    while (cmsg && target_cmsg) {
        void *data = CMSG_DATA(cmsg);
        void *target_data = TARGET_CMSG_DATA(target_cmsg);

        int len = cmsg->cmsg_len - CMSG_ALIGN(sizeof (struct cmsghdr));

        space += TARGET_CMSG_SPACE(len);
        if (space > msg_controllen) {
            space -= TARGET_CMSG_SPACE(len);
            gemu_log("Target cmsg overflow\n");
            break;
        }

        if (cmsg->cmsg_level == SOL_SOCKET) {
            target_cmsg->cmsg_level = tswap32(TARGET_SOL_SOCKET);
        } else {
            target_cmsg->cmsg_level = tswap32(cmsg->cmsg_level);
        }
        target_cmsg->cmsg_type = tswap32(cmsg->cmsg_type);
        target_cmsg->cmsg_len = tswapal(TARGET_CMSG_LEN(len));

        if ((cmsg->cmsg_level == SOL_SOCKET) &&
                                (cmsg->cmsg_type == SCM_RIGHTS)) {
            int *fd = (int *)data;
            int *target_fd = (int *)target_data;
            int i, numfds = len / sizeof(int);

            for (i = 0; i < numfds; i++)
                target_fd[i] = tswap32(fd[i]);
        } else if ((cmsg->cmsg_level == SOL_SOCKET) &&
                                (cmsg->cmsg_type == SO_TIMESTAMP) &&
                                (len == sizeof(struct timeval))) {
            /* copy struct timeval to target */
            struct timeval *tv = (struct timeval *)data;
            struct target_timeval *target_tv =
                                        (struct target_timeval *)target_data;

            target_tv->tv_sec = tswapal(tv->tv_sec);
            target_tv->tv_usec = tswapal(tv->tv_usec);
        } else {
            gemu_log("Unsupported ancillary data: %d/%d\n",
                                        cmsg->cmsg_level, cmsg->cmsg_type);
            memcpy(target_data, data, len);
        }

        cmsg = CMSG_NXTHDR(msgh, cmsg);
        target_cmsg = TARGET_CMSG_NXTHDR(target_msgh, target_cmsg);
    }
    unlock_user(target_cmsg, target_cmsg_addr, space);
 the_end:
    target_msgh->msg_controllen = tswapal(space);
    return 0;
}

/* do_setsockopt() Must return target values and target errnos. */
static abi_long do_setsockopt(int sockfd, int level, int optname,
                              abi_ulong optval_addr, socklen_t optlen)
{
    abi_long ret;
    int val;
    struct ip_mreqn *ip_mreq;
    struct ip_mreq_source *ip_mreq_source;

    switch(level) {
    case SOL_TCP:
        /* TCP options all take an 'int' value.  */
        if (optlen < sizeof(uint32_t))
            return -TARGET_EINVAL;

        if (get_user_u32(val, optval_addr))
            return -TARGET_EFAULT;
        ret = get_errno(setsockopt(sockfd, level, optname, &val, sizeof(val)));
        break;
    case SOL_IP:
        switch(optname) {
        case IP_TOS:
        case IP_TTL:
        case IP_HDRINCL:
        case IP_ROUTER_ALERT:
        case IP_RECVOPTS:
        case IP_RETOPTS:
        case IP_PKTINFO:
        case IP_MTU_DISCOVER:
        case IP_RECVERR:
        case IP_RECVTOS:
#ifdef IP_FREEBIND
        case IP_FREEBIND:
#endif
        case IP_MULTICAST_TTL:
        case IP_MULTICAST_LOOP:
            val = 0;
            if (optlen >= sizeof(uint32_t)) {
                if (get_user_u32(val, optval_addr))
                    return -TARGET_EFAULT;
            } else if (optlen >= 1) {
                if (get_user_u8(val, optval_addr))
                    return -TARGET_EFAULT;
            }
            ret = get_errno(setsockopt(sockfd, level, optname, &val, sizeof(val)));
            break;
        case IP_ADD_MEMBERSHIP:
        case IP_DROP_MEMBERSHIP:
            if (optlen < sizeof (struct target_ip_mreq) ||
                optlen > sizeof (struct target_ip_mreqn))
                return -TARGET_EINVAL;

            ip_mreq = (struct ip_mreqn *) alloca(optlen);
            target_to_host_ip_mreq(ip_mreq, optval_addr, optlen);
            ret = get_errno(setsockopt(sockfd, level, optname, ip_mreq, optlen));
            break;

        case IP_BLOCK_SOURCE:
        case IP_UNBLOCK_SOURCE:
        case IP_ADD_SOURCE_MEMBERSHIP:
        case IP_DROP_SOURCE_MEMBERSHIP:
            if (optlen != sizeof (struct target_ip_mreq_source))
                return -TARGET_EINVAL;

            ip_mreq_source = lock_user(VERIFY_READ, optval_addr, optlen, 1);
            ret = get_errno(setsockopt(sockfd, level, optname, ip_mreq_source, optlen));
            unlock_user (ip_mreq_source, optval_addr, 0);
            break;

        default:
            goto unimplemented;
        }
        break;
    case SOL_IPV6:
        switch (optname) {
        case IPV6_MTU_DISCOVER:
        case IPV6_MTU:
        case IPV6_V6ONLY:
        case IPV6_RECVPKTINFO:
            val = 0;
            if (optlen < sizeof(uint32_t)) {
                return -TARGET_EINVAL;
            }
            if (get_user_u32(val, optval_addr)) {
                return -TARGET_EFAULT;
            }
            ret = get_errno(setsockopt(sockfd, level, optname,
                                       &val, sizeof(val)));
            break;
        default:
            goto unimplemented;
        }
        break;
    case SOL_RAW:
        switch (optname) {
        case ICMP_FILTER:
            /* struct icmp_filter takes an u32 value */
            if (optlen < sizeof(uint32_t)) {
                return -TARGET_EINVAL;
            }

            if (get_user_u32(val, optval_addr)) {
                return -TARGET_EFAULT;
            }
            ret = get_errno(setsockopt(sockfd, level, optname,
                                       &val, sizeof(val)));
            break;

        default:
            goto unimplemented;
        }
        break;
    case TARGET_SOL_SOCKET:
        switch (optname) {
        case TARGET_SO_RCVTIMEO:
        {
                struct timeval tv;

                optname = SO_RCVTIMEO;

set_timeout:
                if (optlen != sizeof(struct target_timeval)) {
                    return -TARGET_EINVAL;
                }

                if (copy_from_user_timeval(&tv, optval_addr)) {
                    return -TARGET_EFAULT;
                }

                ret = get_errno(setsockopt(sockfd, SOL_SOCKET, optname,
                                &tv, sizeof(tv)));
                return ret;
        }
        case TARGET_SO_SNDTIMEO:
                optname = SO_SNDTIMEO;
                goto set_timeout;
        case TARGET_SO_ATTACH_FILTER:
        {
                struct target_sock_fprog *tfprog;
                struct target_sock_filter *tfilter;
                struct sock_fprog fprog;
                struct sock_filter *filter;
                int i;

                if (optlen != sizeof(*tfprog)) {
                    return -TARGET_EINVAL;
                }
                if (!lock_user_struct(VERIFY_READ, tfprog, optval_addr, 0)) {
                    return -TARGET_EFAULT;
                }
                if (!lock_user_struct(VERIFY_READ, tfilter,
                                      tswapal(tfprog->filter), 0)) {
                    unlock_user_struct(tfprog, optval_addr, 1);
                    return -TARGET_EFAULT;
                }

                fprog.len = tswap16(tfprog->len);
                filter = malloc(fprog.len * sizeof(*filter));
                if (filter == NULL) {
                    unlock_user_struct(tfilter, tfprog->filter, 1);
                    unlock_user_struct(tfprog, optval_addr, 1);
                    return -TARGET_ENOMEM;
                }
                for (i = 0; i < fprog.len; i++) {
                    filter[i].code = tswap16(tfilter[i].code);
                    filter[i].jt = tfilter[i].jt;
                    filter[i].jf = tfilter[i].jf;
                    filter[i].k = tswap32(tfilter[i].k);
                }
                fprog.filter = filter;

                ret = get_errno(setsockopt(sockfd, SOL_SOCKET,
                                SO_ATTACH_FILTER, &fprog, sizeof(fprog)));
                free(filter);

                unlock_user_struct(tfilter, tfprog->filter, 1);
                unlock_user_struct(tfprog, optval_addr, 1);
                return ret;
        }
            /* Options with 'int' argument.  */
        case TARGET_SO_DEBUG:
                optname = SO_DEBUG;
                break;
        case TARGET_SO_REUSEADDR:
                optname = SO_REUSEADDR;
                break;
        case TARGET_SO_TYPE:
                optname = SO_TYPE;
                break;
        case TARGET_SO_ERROR:
                optname = SO_ERROR;
                break;
        case TARGET_SO_DONTROUTE:
                optname = SO_DONTROUTE;
                break;
        case TARGET_SO_BROADCAST:
                optname = SO_BROADCAST;
                break;
        case TARGET_SO_SNDBUF:
                optname = SO_SNDBUF;
                break;
        case TARGET_SO_RCVBUF:
                optname = SO_RCVBUF;
                break;
        case TARGET_SO_KEEPALIVE:
                optname = SO_KEEPALIVE;
                break;
        case TARGET_SO_OOBINLINE:
                optname = SO_OOBINLINE;
                break;
        case TARGET_SO_NO_CHECK:
                optname = SO_NO_CHECK;
                break;
        case TARGET_SO_PRIORITY:
                optname = SO_PRIORITY;
                break;
#ifdef SO_BSDCOMPAT
        case TARGET_SO_BSDCOMPAT:
                optname = SO_BSDCOMPAT;
                break;
#endif
        case TARGET_SO_PASSCRED:
                optname = SO_PASSCRED;
                break;
        case TARGET_SO_TIMESTAMP:
                optname = SO_TIMESTAMP;
                break;
        case TARGET_SO_RCVLOWAT:
                optname = SO_RCVLOWAT;
                break;
            break;
        default:
            goto unimplemented;
        }
        if (optlen < sizeof(uint32_t))
            return -TARGET_EINVAL;

        if (get_user_u32(val, optval_addr))
            return -TARGET_EFAULT;
        ret = get_errno(setsockopt(sockfd, SOL_SOCKET, optname, &val, sizeof(val)));
        break;
    default:
    unimplemented:
        gemu_log("Unsupported setsockopt level=%d optname=%d\n", level, optname);
        ret = -TARGET_ENOPROTOOPT;
    }
    return ret;
}

/* do_getsockopt() Must return target values and target errnos. */
static abi_long do_getsockopt(int sockfd, int level, int optname,
                              abi_ulong optval_addr, abi_ulong optlen)
{
    abi_long ret;
    int len, val;
    socklen_t lv;

    switch(level) {
    case TARGET_SOL_SOCKET:
        level = SOL_SOCKET;
        switch (optname) {
        /* These don't just return a single integer */
        case TARGET_SO_LINGER:
        case TARGET_SO_RCVTIMEO:
        case TARGET_SO_SNDTIMEO:
        case TARGET_SO_PEERNAME:
            goto unimplemented;
        case TARGET_SO_PEERCRED: {
            struct ucred cr;
            socklen_t crlen;
            struct target_ucred *tcr;

            if (get_user_u32(len, optlen)) {
                return -TARGET_EFAULT;
            }
            if (len < 0) {
                return -TARGET_EINVAL;
            }

            crlen = sizeof(cr);
            ret = get_errno(getsockopt(sockfd, level, SO_PEERCRED,
                                       &cr, &crlen));
            if (ret < 0) {
                return ret;
            }
            if (len > crlen) {
                len = crlen;
            }
            if (!lock_user_struct(VERIFY_WRITE, tcr, optval_addr, 0)) {
                return -TARGET_EFAULT;
            }
            __put_user(cr.pid, &tcr->pid);
            __put_user(cr.uid, &tcr->uid);
            __put_user(cr.gid, &tcr->gid);
            unlock_user_struct(tcr, optval_addr, 1);
            if (put_user_u32(len, optlen)) {
                return -TARGET_EFAULT;
            }
            break;
        }
        /* Options with 'int' argument.  */
        case TARGET_SO_DEBUG:
            optname = SO_DEBUG;
            goto int_case;
        case TARGET_SO_REUSEADDR:
            optname = SO_REUSEADDR;
            goto int_case;
        case TARGET_SO_TYPE:
            optname = SO_TYPE;
            goto int_case;
        case TARGET_SO_ERROR:
            optname = SO_ERROR;
            goto int_case;
        case TARGET_SO_DONTROUTE:
            optname = SO_DONTROUTE;
            goto int_case;
        case TARGET_SO_BROADCAST:
            optname = SO_BROADCAST;
            goto int_case;
        case TARGET_SO_SNDBUF:
            optname = SO_SNDBUF;
            goto int_case;
        case TARGET_SO_RCVBUF:
            optname = SO_RCVBUF;
            goto int_case;
        case TARGET_SO_KEEPALIVE:
            optname = SO_KEEPALIVE;
            goto int_case;
        case TARGET_SO_OOBINLINE:
            optname = SO_OOBINLINE;
            goto int_case;
        case TARGET_SO_NO_CHECK:
            optname = SO_NO_CHECK;
            goto int_case;
        case TARGET_SO_PRIORITY:
            optname = SO_PRIORITY;
            goto int_case;
#ifdef SO_BSDCOMPAT
        case TARGET_SO_BSDCOMPAT:
            optname = SO_BSDCOMPAT;
            goto int_case;
#endif
        case TARGET_SO_PASSCRED:
            optname = SO_PASSCRED;
            goto int_case;
        case TARGET_SO_TIMESTAMP:
            optname = SO_TIMESTAMP;
            goto int_case;
        case TARGET_SO_RCVLOWAT:
            optname = SO_RCVLOWAT;
            goto int_case;
        default:
            goto int_case;
        }
        break;
    case SOL_TCP:
        /* TCP options all take an 'int' value.  */
    int_case:
        if (get_user_u32(len, optlen))
            return -TARGET_EFAULT;
        if (len < 0)
            return -TARGET_EINVAL;
        lv = sizeof(lv);
        ret = get_errno(getsockopt(sockfd, level, optname, &val, &lv));
        if (ret < 0)
            return ret;
        if (len > lv)
            len = lv;
        if (len == 4) {
            if (put_user_u32(val, optval_addr))
                return -TARGET_EFAULT;
        } else {
            if (put_user_u8(val, optval_addr))
                return -TARGET_EFAULT;
        }
        if (put_user_u32(len, optlen))
            return -TARGET_EFAULT;
        break;
    case SOL_IP:
        switch(optname) {
        case IP_TOS:
        case IP_TTL:
        case IP_HDRINCL:
        case IP_ROUTER_ALERT:
        case IP_RECVOPTS:
        case IP_RETOPTS:
        case IP_PKTINFO:
        case IP_MTU_DISCOVER:
        case IP_RECVERR:
        case IP_RECVTOS:
#ifdef IP_FREEBIND
        case IP_FREEBIND:
#endif
        case IP_MULTICAST_TTL:
        case IP_MULTICAST_LOOP:
            if (get_user_u32(len, optlen))
                return -TARGET_EFAULT;
            if (len < 0)
                return -TARGET_EINVAL;
            lv = sizeof(lv);
            ret = get_errno(getsockopt(sockfd, level, optname, &val, &lv));
            if (ret < 0)
                return ret;
            if (len < sizeof(int) && len > 0 && val >= 0 && val < 255) {
                len = 1;
                if (put_user_u32(len, optlen)
                    || put_user_u8(val, optval_addr))
                    return -TARGET_EFAULT;
            } else {
                if (len > sizeof(int))
                    len = sizeof(int);
                if (put_user_u32(len, optlen)
                    || put_user_u32(val, optval_addr))
                    return -TARGET_EFAULT;
            }
            break;
        default:
            ret = -TARGET_ENOPROTOOPT;
            break;
        }
        break;
    default:
    unimplemented:
        gemu_log("getsockopt level=%d optname=%d not yet supported\n",
                 level, optname);
        ret = -TARGET_EOPNOTSUPP;
        break;
    }
    return ret;
}

static struct iovec *lock_iovec(int type, abi_ulong target_addr,
                                int count, int copy)
{
    struct target_iovec *target_vec;
    struct iovec *vec;
    abi_ulong total_len, max_len;
    int i;

    if (count == 0) {
        errno = 0;
        return NULL;
    }
    if (count < 0 || count > IOV_MAX) {
        errno = EINVAL;
        return NULL;
    }

    vec = calloc(count, sizeof(struct iovec));
    if (vec == NULL) {
        errno = ENOMEM;
        return NULL;
    }

    target_vec = lock_user(VERIFY_READ, target_addr,
                           count * sizeof(struct target_iovec), 1);
    if (target_vec == NULL) {
        errno = EFAULT;
        goto fail2;
    }

    /* ??? If host page size > target page size, this will result in a
       value larger than what we can actually support.  */
    max_len = 0x7fffffff & TARGET_PAGE_MASK;
    total_len = 0;

    for (i = 0; i < count; i++) {
        abi_ulong base = tswapal(target_vec[i].iov_base);
        abi_long len = tswapal(target_vec[i].iov_len);

        if (len < 0) {
            errno = EINVAL;
            goto fail;
        } else if (len == 0) {
            /* Zero length pointer is ignored.  */
            vec[i].iov_base = 0;
        } else {
            vec[i].iov_base = lock_user(type, base, len, copy);
            if (!vec[i].iov_base) {
                errno = EFAULT;
                goto fail;
            }
            if (len > max_len - total_len) {
                len = max_len - total_len;
            }
        }
        vec[i].iov_len = len;
        total_len += len;
    }

    unlock_user(target_vec, target_addr, 0);
    return vec;

 fail:
    free(vec);
 fail2:
    unlock_user(target_vec, target_addr, 0);
    return NULL;
}

static void unlock_iovec(struct iovec *vec, abi_ulong target_addr,
                         int count, int copy)
{
    struct target_iovec *target_vec;
    int i;

    target_vec = lock_user(VERIFY_READ, target_addr,
                           count * sizeof(struct target_iovec), 1);
    if (target_vec) {
        for (i = 0; i < count; i++) {
            abi_ulong base = tswapal(target_vec[i].iov_base);
            abi_long len = tswapal(target_vec[i].iov_base);
            if (len < 0) {
                break;
            }
            unlock_user(vec[i].iov_base, base, copy ? vec[i].iov_len : 0);
        }
        unlock_user(target_vec, target_addr, 0);
    }

    free(vec);
}

static inline int target_to_host_sock_type(int *type)
{
    int host_type = 0;
    int target_type = *type;

    switch (target_type & TARGET_SOCK_TYPE_MASK) {
    case TARGET_SOCK_DGRAM:
        host_type = SOCK_DGRAM;
        break;
    case TARGET_SOCK_STREAM:
        host_type = SOCK_STREAM;
        break;
    default:
        host_type = target_type & TARGET_SOCK_TYPE_MASK;
        break;
    }
    if (target_type & TARGET_SOCK_CLOEXEC) {
#if defined(SOCK_CLOEXEC)
        host_type |= SOCK_CLOEXEC;
#else
        return -TARGET_EINVAL;
#endif
    }
    if (target_type & TARGET_SOCK_NONBLOCK) {
#if defined(SOCK_NONBLOCK)
        host_type |= SOCK_NONBLOCK;
#elif !defined(O_NONBLOCK)
        return -TARGET_EINVAL;
#endif
    }
    *type = host_type;
    return 0;
}

/* Try to emulate socket type flags after socket creation.  */
static int sock_flags_fixup(int fd, int target_type)
{
#if !defined(SOCK_NONBLOCK) && defined(O_NONBLOCK)
    if (target_type & TARGET_SOCK_NONBLOCK) {
        int flags = fcntl(fd, F_GETFL);
        if (fcntl(fd, F_SETFL, O_NONBLOCK | flags) == -1) {
            close(fd);
            return -TARGET_EINVAL;
        }
    }
#endif
    return fd;
}

/* do_socket() Must return target values and target errnos. */
static abi_long do_socket(int domain, int type, int protocol)
{
    int target_type = type;
    int ret;

    ret = target_to_host_sock_type(&type);
    if (ret) {
        return ret;
    }

    if (domain == PF_NETLINK)
        return -EAFNOSUPPORT; /* do not NETLINK socket connections possible */
    ret = get_errno(socket(domain, type, protocol));
    if (ret >= 0) {
        ret = sock_flags_fixup(ret, target_type);
    }
    return ret;
}

/* do_bind() Must return target values and target errnos. */
static abi_long do_bind(int sockfd, abi_ulong target_addr,
                        socklen_t addrlen)
{
    void *addr;
    abi_long ret;

    if ((int)addrlen < 0) {
        return -TARGET_EINVAL;
    }

    addr = alloca(addrlen+1);

    ret = target_to_host_sockaddr(addr, target_addr, addrlen);
    if (ret)
        return ret;

    return get_errno(bind(sockfd, addr, addrlen));
}

/* do_connect() Must return target values and target errnos. */
static abi_long do_connect(int sockfd, abi_ulong target_addr,
                           socklen_t addrlen)
{
    void *addr;
    abi_long ret;

    if ((int)addrlen < 0) {
        return -TARGET_EINVAL;
    }

    addr = alloca(addrlen);

    ret = target_to_host_sockaddr(addr, target_addr, addrlen);
    if (ret)
        return ret;

    return get_errno(connect(sockfd, addr, addrlen));
}

/* do_sendrecvmsg() Must return target values and target errnos. */
static abi_long do_sendrecvmsg(int fd, abi_ulong target_msg,
                               int flags, int send)
{
    abi_long ret, len;
    struct target_msghdr *msgp;
    struct msghdr msg;
    int count;
    struct iovec *vec;
    abi_ulong target_vec;

    /* FIXME */
    if (!lock_user_struct(send ? VERIFY_READ : VERIFY_WRITE,
                          msgp,
                          target_msg,
                          send ? 1 : 0))
        return -TARGET_EFAULT;
    if (msgp->msg_name) {
        msg.msg_namelen = tswap32(msgp->msg_namelen);
        msg.msg_name = alloca(msg.msg_namelen);
        ret = target_to_host_sockaddr(msg.msg_name, tswapal(msgp->msg_name),
                                msg.msg_namelen);
        if (ret) {
            goto out2;
        }
    } else {
        msg.msg_name = NULL;
        msg.msg_namelen = 0;
    }
    msg.msg_controllen = 2 * tswapal(msgp->msg_controllen);
    msg.msg_control = alloca(msg.msg_controllen);
    msg.msg_flags = tswap32(msgp->msg_flags);

    count = tswapal(msgp->msg_iovlen);
    target_vec = tswapal(msgp->msg_iov);
    vec = lock_iovec(send ? VERIFY_READ : VERIFY_WRITE,
                     target_vec, count, send);
    if (vec == NULL) {
        ret = -host_to_target_errno(errno);
        goto out2;
    }
    msg.msg_iovlen = count;
    msg.msg_iov = vec;

    if (send) {
        ret = target_to_host_cmsg(&msg, msgp);
        if (ret == 0)
            ret = get_errno(sendmsg(fd, &msg, flags));
    } else {
        ret = get_errno(recvmsg(fd, &msg, flags));
        if (!is_error(ret)) {
            len = ret;
            ret = host_to_target_cmsg(msgp, &msg);
            if (!is_error(ret)) {
                msgp->msg_namelen = tswap32(msg.msg_namelen);
                if (msg.msg_name != NULL) {
                    ret = host_to_target_sockaddr(tswapal(msgp->msg_name),
                                    msg.msg_name, msg.msg_namelen);
                    if (ret) {
                        goto out;
                    }
                }

                ret = len;
            }
        }
    }

out:
    unlock_iovec(vec, target_vec, count, !send);
out2:
    unlock_user_struct(msgp, target_msg, send ? 0 : 1);
    return ret;
}

/* If we don't have a system accept4() then just call accept.
 * The callsites to do_accept4() will ensure that they don't
 * pass a non-zero flags argument in this config.
 */
#ifndef CONFIG_ACCEPT4
static inline int accept4(int sockfd, struct sockaddr *addr,
                          socklen_t *addrlen, int flags)
{
    assert(flags == 0);
    return accept(sockfd, addr, addrlen);
}
#endif

/* do_accept4() Must return target values and target errnos. */
static abi_long do_accept4(int fd, abi_ulong target_addr,
                           abi_ulong target_addrlen_addr, int flags)
{
    socklen_t addrlen;
    void *addr;
    abi_long ret;

    if (target_addr == 0) {
        return get_errno(accept4(fd, NULL, NULL, flags));
    }

    /* linux returns EINVAL if addrlen pointer is invalid */
    if (get_user_u32(addrlen, target_addrlen_addr))
        return -TARGET_EINVAL;

    if ((int)addrlen < 0) {
        return -TARGET_EINVAL;
    }

    if (!access_ok(VERIFY_WRITE, target_addr, addrlen))
        return -TARGET_EINVAL;

    addr = alloca(addrlen);

    ret = get_errno(accept4(fd, addr, &addrlen, flags));
    if (!is_error(ret)) {
        host_to_target_sockaddr(target_addr, addr, addrlen);

        if (put_user_u32(addrlen, target_addrlen_addr))
            ret = -TARGET_EFAULT;
    }
    return ret;
}

/* do_getpeername() Must return target values and target errnos. */
static abi_long do_getpeername(int fd, abi_ulong target_addr,
                               abi_ulong target_addrlen_addr)
{
    socklen_t addrlen;
    void *addr;
    abi_long ret;

    if (get_user_u32(addrlen, target_addrlen_addr))
        return -TARGET_EFAULT;

    if ((int)addrlen < 0) {
        return -TARGET_EINVAL;
    }

    if (!access_ok(VERIFY_WRITE, target_addr, addrlen))
        return -TARGET_EFAULT;

    addr = alloca(addrlen);

    ret = get_errno(getpeername(fd, addr, &addrlen));
    if (!is_error(ret)) {
        host_to_target_sockaddr(target_addr, addr, addrlen);
        if (put_user_u32(addrlen, target_addrlen_addr))
            ret = -TARGET_EFAULT;
    }
    return ret;
}

/* do_getsockname() Must return target values and target errnos. */
static abi_long do_getsockname(int fd, abi_ulong target_addr,
                               abi_ulong target_addrlen_addr)
{
    socklen_t addrlen;
    void *addr;
    abi_long ret;

    if (get_user_u32(addrlen, target_addrlen_addr))
        return -TARGET_EFAULT;

    if ((int)addrlen < 0) {
        return -TARGET_EINVAL;
    }

    if (!access_ok(VERIFY_WRITE, target_addr, addrlen))
        return -TARGET_EFAULT;

    addr = alloca(addrlen);

    ret = get_errno(getsockname(fd, addr, &addrlen));
    if (!is_error(ret)) {
        host_to_target_sockaddr(target_addr, addr, addrlen);
        if (put_user_u32(addrlen, target_addrlen_addr))
            ret = -TARGET_EFAULT;
    }
    return ret;
}

/* do_socketpair() Must return target values and target errnos. */
static abi_long do_socketpair(int domain, int type, int protocol,
                              abi_ulong target_tab_addr)
{
    int tab[2];
    abi_long ret;

    target_to_host_sock_type(&type);

    ret = get_errno(socketpair(domain, type, protocol, tab));
    if (!is_error(ret)) {
        if (put_user_s32(tab[0], target_tab_addr)
            || put_user_s32(tab[1], target_tab_addr + sizeof(tab[0])))
            ret = -TARGET_EFAULT;
    }
    return ret;
}

/* do_sendto() Must return target values and target errnos. */
static abi_long do_sendto(int fd, abi_ulong msg, size_t len, int flags,
                          abi_ulong target_addr, socklen_t addrlen)
{
    void *addr;
    void *host_msg;
    abi_long ret;

    if ((int)addrlen < 0) {
        return -TARGET_EINVAL;
    }

    host_msg = lock_user(VERIFY_READ, msg, len, 1);
    if (!host_msg)
        return -TARGET_EFAULT;
    if (target_addr) {
        addr = alloca(addrlen);
        ret = target_to_host_sockaddr(addr, target_addr, addrlen);
        if (ret) {
            unlock_user(host_msg, msg, 0);
            return ret;
        }
        ret = get_errno(sendto(fd, host_msg, len, flags, addr, addrlen));
    } else {
        ret = get_errno(send(fd, host_msg, len, flags));
    }
    unlock_user(host_msg, msg, 0);
    return ret;
}

/* do_recvfrom() Must return target values and target errnos. */
static abi_long do_recvfrom(int fd, abi_ulong msg, size_t len, int flags,
                            abi_ulong target_addr,
                            abi_ulong target_addrlen)
{
    socklen_t addrlen;
    void *addr;
    void *host_msg;
    abi_long ret;

    host_msg = lock_user(VERIFY_WRITE, msg, len, 0);
    if (!host_msg)
        return -TARGET_EFAULT;
    if (target_addr) {
        if (get_user_u32(addrlen, target_addrlen)) {
            ret = -TARGET_EFAULT;
            goto fail;
        }
        if ((int)addrlen < 0) {
            ret = -TARGET_EINVAL;
            goto fail;
        }
        addr = alloca(addrlen);
        ret = get_errno(recvfrom(fd, host_msg, len, flags, addr, &addrlen));
    } else {
        addr = NULL; /* To keep compiler quiet.  */
        ret = get_errno(qemu_recv(fd, host_msg, len, flags));
    }
    if (!is_error(ret)) {
        if (target_addr) {
            host_to_target_sockaddr(target_addr, addr, addrlen);
            if (put_user_u32(addrlen, target_addrlen)) {
                ret = -TARGET_EFAULT;
                goto fail;
            }
        }
        unlock_user(host_msg, msg, len);
    } else {
fail:
        unlock_user(host_msg, msg, 0);
    }
    return ret;
}

#ifdef TARGET_NR_socketcall
/* do_socketcall() Must return target values and target errnos. */
static abi_long do_socketcall(int num, abi_ulong vptr)
{
    abi_long ret;
    const int n = sizeof(abi_ulong);

    switch(num) {
    case SOCKOP_socket:
        {
            abi_ulong domain, type, protocol;

            if (get_user_ual(domain, vptr)
                || get_user_ual(type, vptr + n)
                || get_user_ual(protocol, vptr + 2 * n))
                return -TARGET_EFAULT;

            ret = do_socket(domain, type, protocol);
        }
        break;
    case SOCKOP_bind:
        {
            abi_ulong sockfd;
            abi_ulong target_addr;
            socklen_t addrlen;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(target_addr, vptr + n)
                || get_user_ual(addrlen, vptr + 2 * n))
                return -TARGET_EFAULT;

            ret = do_bind(sockfd, target_addr, addrlen);
        }
        break;
    case SOCKOP_connect:
        {
            abi_ulong sockfd;
            abi_ulong target_addr;
            socklen_t addrlen;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(target_addr, vptr + n)
                || get_user_ual(addrlen, vptr + 2 * n))
                return -TARGET_EFAULT;

            ret = do_connect(sockfd, target_addr, addrlen);
        }
        break;
    case SOCKOP_listen:
        {
            abi_ulong sockfd, backlog;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(backlog, vptr + n))
                return -TARGET_EFAULT;

            ret = get_errno(listen(sockfd, backlog));
        }
        break;
    case SOCKOP_accept:
        {
            abi_ulong sockfd;
            abi_ulong target_addr, target_addrlen;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(target_addr, vptr + n)
                || get_user_ual(target_addrlen, vptr + 2 * n))
                return -TARGET_EFAULT;

            ret = do_accept4(sockfd, target_addr, target_addrlen, 0);
        }
        break;
    case SOCKOP_getsockname:
        {
            abi_ulong sockfd;
            abi_ulong target_addr, target_addrlen;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(target_addr, vptr + n)
                || get_user_ual(target_addrlen, vptr + 2 * n))
                return -TARGET_EFAULT;

            ret = do_getsockname(sockfd, target_addr, target_addrlen);
        }
        break;
    case SOCKOP_getpeername:
        {
            abi_ulong sockfd;
            abi_ulong target_addr, target_addrlen;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(target_addr, vptr + n)
                || get_user_ual(target_addrlen, vptr + 2 * n))
                return -TARGET_EFAULT;

            ret = do_getpeername(sockfd, target_addr, target_addrlen);
        }
        break;
    case SOCKOP_socketpair:
        {
            abi_ulong domain, type, protocol;
            abi_ulong tab;

            if (get_user_ual(domain, vptr)
                || get_user_ual(type, vptr + n)
                || get_user_ual(protocol, vptr + 2 * n)
                || get_user_ual(tab, vptr + 3 * n))
                return -TARGET_EFAULT;

            ret = do_socketpair(domain, type, protocol, tab);
        }
        break;
    case SOCKOP_send:
        {
            abi_ulong sockfd;
            abi_ulong msg;
            size_t len;
            abi_ulong flags;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(msg, vptr + n)
                || get_user_ual(len, vptr + 2 * n)
                || get_user_ual(flags, vptr + 3 * n))
                return -TARGET_EFAULT;

            ret = do_sendto(sockfd, msg, len, flags, 0, 0);
        }
        break;
    case SOCKOP_recv:
        {
            abi_ulong sockfd;
            abi_ulong msg;
            size_t len;
            abi_ulong flags;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(msg, vptr + n)
                || get_user_ual(len, vptr + 2 * n)
                || get_user_ual(flags, vptr + 3 * n))
                return -TARGET_EFAULT;

            ret = do_recvfrom(sockfd, msg, len, flags, 0, 0);
        }
        break;
    case SOCKOP_sendto:
        {
            abi_ulong sockfd;
            abi_ulong msg;
            size_t len;
            abi_ulong flags;
            abi_ulong addr;
            socklen_t addrlen;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(msg, vptr + n)
                || get_user_ual(len, vptr + 2 * n)
                || get_user_ual(flags, vptr + 3 * n)
                || get_user_ual(addr, vptr + 4 * n)
                || get_user_ual(addrlen, vptr + 5 * n))
                return -TARGET_EFAULT;

            ret = do_sendto(sockfd, msg, len, flags, addr, addrlen);
        }
        break;
    case SOCKOP_recvfrom:
        {
            abi_ulong sockfd;
            abi_ulong msg;
            size_t len;
            abi_ulong flags;
            abi_ulong addr;
            socklen_t addrlen;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(msg, vptr + n)
                || get_user_ual(len, vptr + 2 * n)
                || get_user_ual(flags, vptr + 3 * n)
                || get_user_ual(addr, vptr + 4 * n)
                || get_user_ual(addrlen, vptr + 5 * n))
                return -TARGET_EFAULT;

            ret = do_recvfrom(sockfd, msg, len, flags, addr, addrlen);
        }
        break;
    case SOCKOP_shutdown:
        {
            abi_ulong sockfd, how;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(how, vptr + n))
                return -TARGET_EFAULT;

            ret = get_errno(shutdown(sockfd, how));
        }
        break;
    case SOCKOP_sendmsg:
    case SOCKOP_recvmsg:
        {
            abi_ulong fd;
            abi_ulong target_msg;
            abi_ulong flags;

            if (get_user_ual(fd, vptr)
                || get_user_ual(target_msg, vptr + n)
                || get_user_ual(flags, vptr + 2 * n))
                return -TARGET_EFAULT;

            ret = do_sendrecvmsg(fd, target_msg, flags,
                                 (num == SOCKOP_sendmsg));
        }
        break;
    case SOCKOP_setsockopt:
        {
            abi_ulong sockfd;
            abi_ulong level;
            abi_ulong optname;
            abi_ulong optval;
            socklen_t optlen;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(level, vptr + n)
                || get_user_ual(optname, vptr + 2 * n)
                || get_user_ual(optval, vptr + 3 * n)
                || get_user_ual(optlen, vptr + 4 * n))
                return -TARGET_EFAULT;

            ret = do_setsockopt(sockfd, level, optname, optval, optlen);
        }
        break;
    case SOCKOP_getsockopt:
        {
            abi_ulong sockfd;
            abi_ulong level;
            abi_ulong optname;
            abi_ulong optval;
            socklen_t optlen;

            if (get_user_ual(sockfd, vptr)
                || get_user_ual(level, vptr + n)
                || get_user_ual(optname, vptr + 2 * n)
                || get_user_ual(optval, vptr + 3 * n)
                || get_user_ual(optlen, vptr + 4 * n))
                return -TARGET_EFAULT;

            ret = do_getsockopt(sockfd, level, optname, optval, optlen);
        }
        break;
    default:
        gemu_log("Unsupported socketcall: %d\n", num);
        ret = -TARGET_ENOSYS;
        break;
    }
    return ret;
}
#endif

#define N_SHM_REGIONS   32

static struct shm_region {
    abi_ulong   start;
    abi_ulong   size;
} shm_regions[N_SHM_REGIONS];

struct target_ipc_perm
{
    abi_long __key;
    abi_ulong uid;
    abi_ulong gid;
    abi_ulong cuid;
    abi_ulong cgid;
    unsigned short int mode;
    unsigned short int __pad1;
    unsigned short int __seq;
    unsigned short int __pad2;
    abi_ulong __unused1;
    abi_ulong __unused2;
};

struct target_semid_ds
{
  struct target_ipc_perm sem_perm;
  abi_ulong sem_otime;
  abi_ulong __unused1;
  abi_ulong sem_ctime;
  abi_ulong __unused2;
  abi_ulong sem_nsems;
  abi_ulong __unused3;
  abi_ulong __unused4;
};

static inline abi_long target_to_host_ipc_perm(struct ipc_perm *host_ip,
                                               abi_ulong target_addr)
{
    struct target_ipc_perm *target_ip;
    struct target_semid_ds *target_sd;

    if (!lock_user_struct(VERIFY_READ, target_sd, target_addr, 1))
        return -TARGET_EFAULT;
    target_ip = &(target_sd->sem_perm);
    host_ip->__key = tswapal(target_ip->__key);
    host_ip->uid = tswapal(target_ip->uid);
    host_ip->gid = tswapal(target_ip->gid);
    host_ip->cuid = tswapal(target_ip->cuid);
    host_ip->cgid = tswapal(target_ip->cgid);
    host_ip->mode = tswap16(target_ip->mode);
    unlock_user_struct(target_sd, target_addr, 0);
    return 0;
}

static inline abi_long host_to_target_ipc_perm(abi_ulong target_addr,
                                               struct ipc_perm *host_ip)
{
    struct target_ipc_perm *target_ip;
    struct target_semid_ds *target_sd;

    if (!lock_user_struct(VERIFY_WRITE, target_sd, target_addr, 0))
        return -TARGET_EFAULT;
    target_ip = &(target_sd->sem_perm);
    target_ip->__key = tswapal(host_ip->__key);
    target_ip->uid = tswapal(host_ip->uid);
    target_ip->gid = tswapal(host_ip->gid);
    target_ip->cuid = tswapal(host_ip->cuid);
    target_ip->cgid = tswapal(host_ip->cgid);
    target_ip->mode = tswap16(host_ip->mode);
    unlock_user_struct(target_sd, target_addr, 1);
    return 0;
}

static inline abi_long target_to_host_semid_ds(struct semid_ds *host_sd,
                                               abi_ulong target_addr)
{
    struct target_semid_ds *target_sd;

    if (!lock_user_struct(VERIFY_READ, target_sd, target_addr, 1))
        return -TARGET_EFAULT;
    if (target_to_host_ipc_perm(&(host_sd->sem_perm),target_addr))
        return -TARGET_EFAULT;
    host_sd->sem_nsems = tswapal(target_sd->sem_nsems);
    host_sd->sem_otime = tswapal(target_sd->sem_otime);
    host_sd->sem_ctime = tswapal(target_sd->sem_ctime);
    unlock_user_struct(target_sd, target_addr, 0);
    return 0;
}

static inline abi_long host_to_target_semid_ds(abi_ulong target_addr,
                                               struct semid_ds *host_sd)
{
    struct target_semid_ds *target_sd;

    if (!lock_user_struct(VERIFY_WRITE, target_sd, target_addr, 0))
        return -TARGET_EFAULT;
    if (host_to_target_ipc_perm(target_addr,&(host_sd->sem_perm)))
        return -TARGET_EFAULT;
    target_sd->sem_nsems = tswapal(host_sd->sem_nsems);
    target_sd->sem_otime = tswapal(host_sd->sem_otime);
    target_sd->sem_ctime = tswapal(host_sd->sem_ctime);
    unlock_user_struct(target_sd, target_addr, 1);
    return 0;
}

struct target_seminfo {
    int semmap;
    int semmni;
    int semmns;
    int semmnu;
    int semmsl;
    int semopm;
    int semume;
    int semusz;
    int semvmx;
    int semaem;
};

static inline abi_long host_to_target_seminfo(abi_ulong target_addr,
                                              struct seminfo *host_seminfo)
{
    struct target_seminfo *target_seminfo;
    if (!lock_user_struct(VERIFY_WRITE, target_seminfo, target_addr, 0))
        return -TARGET_EFAULT;
    __put_user(host_seminfo->semmap, &target_seminfo->semmap);
    __put_user(host_seminfo->semmni, &target_seminfo->semmni);
    __put_user(host_seminfo->semmns, &target_seminfo->semmns);
    __put_user(host_seminfo->semmnu, &target_seminfo->semmnu);
    __put_user(host_seminfo->semmsl, &target_seminfo->semmsl);
    __put_user(host_seminfo->semopm, &target_seminfo->semopm);
    __put_user(host_seminfo->semume, &target_seminfo->semume);
    __put_user(host_seminfo->semusz, &target_seminfo->semusz);
    __put_user(host_seminfo->semvmx, &target_seminfo->semvmx);
    __put_user(host_seminfo->semaem, &target_seminfo->semaem);
    unlock_user_struct(target_seminfo, target_addr, 1);
    return 0;
}

union semun {
        int val;
        struct semid_ds *buf;
        unsigned short *array;
        struct seminfo *__buf;
};

union target_semun {
        int val;
        abi_ulong buf;
        abi_ulong array;
        abi_ulong __buf;
};

static inline abi_long target_to_host_semarray(int semid, unsigned short **host_array,
                                               abi_ulong target_addr)
{
    int nsems;
    unsigned short *array;
    union semun semun;
    struct semid_ds semid_ds;
    int i, ret;

    semun.buf = &semid_ds;

    ret = semctl(semid, 0, IPC_STAT, semun);
    if (ret == -1)
        return get_errno(ret);

    nsems = semid_ds.sem_nsems;

    *host_array = malloc(nsems*sizeof(unsigned short));
    array = lock_user(VERIFY_READ, target_addr,
                      nsems*sizeof(unsigned short), 1);
    if (!array)
        return -TARGET_EFAULT;

    for(i=0; i<nsems; i++) {
        __get_user((*host_array)[i], &array[i]);
    }
    unlock_user(array, target_addr, 0);

    return 0;
}

static inline abi_long host_to_target_semarray(int semid, abi_ulong target_addr,
                                               unsigned short **host_array)
{
    int nsems;
    unsigned short *array;
    union semun semun;
    struct semid_ds semid_ds;
    int i, ret;

    semun.buf = &semid_ds;

    ret = semctl(semid, 0, IPC_STAT, semun);
    if (ret == -1)
        return get_errno(ret);

    nsems = semid_ds.sem_nsems;

    array = lock_user(VERIFY_WRITE, target_addr,
                      nsems*sizeof(unsigned short), 0);
    if (!array)
        return -TARGET_EFAULT;

    for(i=0; i<nsems; i++) {
        __put_user((*host_array)[i], &array[i]);
    }
    free(*host_array);
    unlock_user(array, target_addr, 1);

    return 0;
}

static inline abi_long do_semctl(int semid, int semnum, int cmd,
                                 union target_semun target_su)
{
    union semun arg;
    struct semid_ds dsarg;
    unsigned short *array = NULL;
    struct seminfo seminfo;
    abi_long ret = -TARGET_EINVAL;
    abi_long err;
    cmd &= 0xff;

    switch( cmd ) {
        case GETVAL:
        case SETVAL:
            arg.val = tswap32(target_su.val);
            ret = get_errno(semctl(semid, semnum, cmd, arg));
            target_su.val = tswap32(arg.val);
            break;
        case GETALL:
        case SETALL:
            err = target_to_host_semarray(semid, &array, target_su.array);
            if (err)
                return err;
            arg.array = array;
            ret = get_errno(semctl(semid, semnum, cmd, arg));
            err = host_to_target_semarray(semid, target_su.array, &array);
            if (err)
                return err;
            break;
        case IPC_STAT:
        case IPC_SET:
        case SEM_STAT:
            err = target_to_host_semid_ds(&dsarg, target_su.buf);
            if (err)
                return err;
            arg.buf = &dsarg;
            ret = get_errno(semctl(semid, semnum, cmd, arg));
            err = host_to_target_semid_ds(target_su.buf, &dsarg);
            if (err)
                return err;
            break;
        case IPC_INFO:
        case SEM_INFO:
            arg.__buf = &seminfo;
            ret = get_errno(semctl(semid, semnum, cmd, arg));
            err = host_to_target_seminfo(target_su.__buf, &seminfo);
            if (err)
                return err;
            break;
        case IPC_RMID:
        case GETPID:
        case GETNCNT:
        case GETZCNT:
            ret = get_errno(semctl(semid, semnum, cmd, NULL));
            break;
    }

    return ret;
}

struct target_sembuf {
    unsigned short sem_num;
    short sem_op;
    short sem_flg;
};

static inline abi_long target_to_host_sembuf(struct sembuf *host_sembuf,
                                             abi_ulong target_addr,
                                             unsigned nsops)
{
    struct target_sembuf *target_sembuf;
    int i;

    target_sembuf = lock_user(VERIFY_READ, target_addr,
                              nsops*sizeof(struct target_sembuf), 1);
    if (!target_sembuf)
        return -TARGET_EFAULT;

    for(i=0; i<nsops; i++) {
        __get_user(host_sembuf[i].sem_num, &target_sembuf[i].sem_num);
        __get_user(host_sembuf[i].sem_op, &target_sembuf[i].sem_op);
        __get_user(host_sembuf[i].sem_flg, &target_sembuf[i].sem_flg);
    }

    unlock_user(target_sembuf, target_addr, 0);

    return 0;
}

static inline abi_long do_semop(int semid, abi_long ptr, unsigned nsops)
{
    struct sembuf sops[nsops];

    if (target_to_host_sembuf(sops, ptr, nsops))
        return -TARGET_EFAULT;

    return get_errno(semop(semid, sops, nsops));
}

struct target_msqid_ds
{
    struct target_ipc_perm msg_perm;
    abi_ulong msg_stime;
#if TARGET_ABI_BITS == 32
    abi_ulong __unused1;
#endif
    abi_ulong msg_rtime;
#if TARGET_ABI_BITS == 32
    abi_ulong __unused2;
#endif
    abi_ulong msg_ctime;
#if TARGET_ABI_BITS == 32
    abi_ulong __unused3;
#endif
    abi_ulong __msg_cbytes;
    abi_ulong msg_qnum;
    abi_ulong msg_qbytes;
    abi_ulong msg_lspid;
    abi_ulong msg_lrpid;
    abi_ulong __unused4;
    abi_ulong __unused5;
};

static inline abi_long target_to_host_msqid_ds(struct msqid_ds *host_md,
                                               abi_ulong target_addr)
{
    struct target_msqid_ds *target_md;

    if (!lock_user_struct(VERIFY_READ, target_md, target_addr, 1))
        return -TARGET_EFAULT;
    if (target_to_host_ipc_perm(&(host_md->msg_perm),target_addr))
        return -TARGET_EFAULT;
    host_md->msg_stime = tswapal(target_md->msg_stime);
    host_md->msg_rtime = tswapal(target_md->msg_rtime);
    host_md->msg_ctime = tswapal(target_md->msg_ctime);
    host_md->__msg_cbytes = tswapal(target_md->__msg_cbytes);
    host_md->msg_qnum = tswapal(target_md->msg_qnum);
    host_md->msg_qbytes = tswapal(target_md->msg_qbytes);
    host_md->msg_lspid = tswapal(target_md->msg_lspid);
    host_md->msg_lrpid = tswapal(target_md->msg_lrpid);
    unlock_user_struct(target_md, target_addr, 0);
    return 0;
}

static inline abi_long host_to_target_msqid_ds(abi_ulong target_addr,
                                               struct msqid_ds *host_md)
{
    struct target_msqid_ds *target_md;

    if (!lock_user_struct(VERIFY_WRITE, target_md, target_addr, 0))
        return -TARGET_EFAULT;
    if (host_to_target_ipc_perm(target_addr,&(host_md->msg_perm)))
        return -TARGET_EFAULT;
    target_md->msg_stime = tswapal(host_md->msg_stime);
    target_md->msg_rtime = tswapal(host_md->msg_rtime);
    target_md->msg_ctime = tswapal(host_md->msg_ctime);
    target_md->__msg_cbytes = tswapal(host_md->__msg_cbytes);
    target_md->msg_qnum = tswapal(host_md->msg_qnum);
    target_md->msg_qbytes = tswapal(host_md->msg_qbytes);
    target_md->msg_lspid = tswapal(host_md->msg_lspid);
    target_md->msg_lrpid = tswapal(host_md->msg_lrpid);
    unlock_user_struct(target_md, target_addr, 1);
    return 0;
}

struct target_msginfo {
    int msgpool;
    int msgmap;
    int msgmax;
    int msgmnb;
    int msgmni;
    int msgssz;
    int msgtql;
    unsigned short int msgseg;
};

static inline abi_long host_to_target_msginfo(abi_ulong target_addr,
                                              struct msginfo *host_msginfo)
{
    struct target_msginfo *target_msginfo;
    if (!lock_user_struct(VERIFY_WRITE, target_msginfo, target_addr, 0))
        return -TARGET_EFAULT;
    __put_user(host_msginfo->msgpool, &target_msginfo->msgpool);
    __put_user(host_msginfo->msgmap, &target_msginfo->msgmap);
    __put_user(host_msginfo->msgmax, &target_msginfo->msgmax);
    __put_user(host_msginfo->msgmnb, &target_msginfo->msgmnb);
    __put_user(host_msginfo->msgmni, &target_msginfo->msgmni);
    __put_user(host_msginfo->msgssz, &target_msginfo->msgssz);
    __put_user(host_msginfo->msgtql, &target_msginfo->msgtql);
    __put_user(host_msginfo->msgseg, &target_msginfo->msgseg);
    unlock_user_struct(target_msginfo, target_addr, 1);
    return 0;
}

static inline abi_long do_msgctl(int msgid, int cmd, abi_long ptr)
{
    struct msqid_ds dsarg;
    struct msginfo msginfo;
    abi_long ret = -TARGET_EINVAL;

    cmd &= 0xff;

    switch (cmd) {
    case IPC_STAT:
    case IPC_SET:
    case MSG_STAT:
        if (target_to_host_msqid_ds(&dsarg,ptr))
            return -TARGET_EFAULT;
        ret = get_errno(msgctl(msgid, cmd, &dsarg));
        if (host_to_target_msqid_ds(ptr,&dsarg))
            return -TARGET_EFAULT;
        break;
    case IPC_RMID:
        ret = get_errno(msgctl(msgid, cmd, NULL));
        break;
    case IPC_INFO:
    case MSG_INFO:
        ret = get_errno(msgctl(msgid, cmd, (struct msqid_ds *)&msginfo));
        if (host_to_target_msginfo(ptr, &msginfo))
            return -TARGET_EFAULT;
        break;
    }

    return ret;
}

struct target_msgbuf {
    abi_long mtype;
    char        mtext[1];
};

static inline abi_long do_msgsnd(int msqid, abi_long msgp,
                                 unsigned int msgsz, int msgflg)
{
    struct target_msgbuf *target_mb;
    struct msgbuf *host_mb;
    abi_long ret = 0;

    if (!lock_user_struct(VERIFY_READ, target_mb, msgp, 0))
        return -TARGET_EFAULT;
    host_mb = malloc(msgsz+sizeof(long));
    host_mb->mtype = (abi_long) tswapal(target_mb->mtype);
    memcpy(host_mb->mtext, target_mb->mtext, msgsz);
    ret = get_errno(msgsnd(msqid, host_mb, msgsz, msgflg));
    free(host_mb);
    unlock_user_struct(target_mb, msgp, 0);

    return ret;
}

static inline abi_long do_msgrcv(int msqid, abi_long msgp,
                                 unsigned int msgsz, abi_long msgtyp,
                                 int msgflg)
{
    struct target_msgbuf *target_mb;
    char *target_mtext;
    struct msgbuf *host_mb;
    abi_long ret = 0;

    if (!lock_user_struct(VERIFY_WRITE, target_mb, msgp, 0))
        return -TARGET_EFAULT;

    host_mb = g_malloc(msgsz+sizeof(long));
    ret = get_errno(msgrcv(msqid, host_mb, msgsz, msgtyp, msgflg));

    if (ret > 0) {
        abi_ulong target_mtext_addr = msgp + sizeof(abi_ulong);
        target_mtext = lock_user(VERIFY_WRITE, target_mtext_addr, ret, 0);
        if (!target_mtext) {
            ret = -TARGET_EFAULT;
            goto end;
        }
        memcpy(target_mb->mtext, host_mb->mtext, ret);
        unlock_user(target_mtext, target_mtext_addr, ret);
    }

    target_mb->mtype = tswapal(host_mb->mtype);

end:
    if (target_mb)
        unlock_user_struct(target_mb, msgp, 1);
    g_free(host_mb);
    return ret;
}

struct target_shmid_ds
{
    struct target_ipc_perm shm_perm;
    abi_ulong shm_segsz;
    abi_ulong shm_atime;
#if TARGET_ABI_BITS == 32
    abi_ulong __unused1;
#endif
    abi_ulong shm_dtime;
#if TARGET_ABI_BITS == 32
    abi_ulong __unused2;
#endif
    abi_ulong shm_ctime;
#if TARGET_ABI_BITS == 32
    abi_ulong __unused3;
#endif
    int shm_cpid;
    int shm_lpid;
    abi_ulong shm_nattch;
    unsigned long int __unused4;
    unsigned long int __unused5;
};

static inline abi_long target_to_host_shmid_ds(struct shmid_ds *host_sd,
                                               abi_ulong target_addr)
{
    struct target_shmid_ds *target_sd;

    if (!lock_user_struct(VERIFY_READ, target_sd, target_addr, 1))
        return -TARGET_EFAULT;
    if (target_to_host_ipc_perm(&(host_sd->shm_perm), target_addr))
        return -TARGET_EFAULT;
    __get_user(host_sd->shm_segsz, &target_sd->shm_segsz);
    __get_user(host_sd->shm_atime, &target_sd->shm_atime);
    __get_user(host_sd->shm_dtime, &target_sd->shm_dtime);
    __get_user(host_sd->shm_ctime, &target_sd->shm_ctime);
    __get_user(host_sd->shm_cpid, &target_sd->shm_cpid);
    __get_user(host_sd->shm_lpid, &target_sd->shm_lpid);
    __get_user(host_sd->shm_nattch, &target_sd->shm_nattch);
    unlock_user_struct(target_sd, target_addr, 0);
    return 0;
}

static inline abi_long host_to_target_shmid_ds(abi_ulong target_addr,
                                               struct shmid_ds *host_sd)
{
    struct target_shmid_ds *target_sd;

    if (!lock_user_struct(VERIFY_WRITE, target_sd, target_addr, 0))
        return -TARGET_EFAULT;
    if (host_to_target_ipc_perm(target_addr, &(host_sd->shm_perm)))
        return -TARGET_EFAULT;
    __put_user(host_sd->shm_segsz, &target_sd->shm_segsz);
    __put_user(host_sd->shm_atime, &target_sd->shm_atime);
    __put_user(host_sd->shm_dtime, &target_sd->shm_dtime);
    __put_user(host_sd->shm_ctime, &target_sd->shm_ctime);
    __put_user(host_sd->shm_cpid, &target_sd->shm_cpid);
    __put_user(host_sd->shm_lpid, &target_sd->shm_lpid);
    __put_user(host_sd->shm_nattch, &target_sd->shm_nattch);
    unlock_user_struct(target_sd, target_addr, 1);
    return 0;
}

struct  target_shminfo {
    abi_ulong shmmax;
    abi_ulong shmmin;
    abi_ulong shmmni;
    abi_ulong shmseg;
    abi_ulong shmall;
};

static inline abi_long host_to_target_shminfo(abi_ulong target_addr,
                                              struct shminfo *host_shminfo)
{
    struct target_shminfo *target_shminfo;
    if (!lock_user_struct(VERIFY_WRITE, target_shminfo, target_addr, 0))
        return -TARGET_EFAULT;
    __put_user(host_shminfo->shmmax, &target_shminfo->shmmax);
    __put_user(host_shminfo->shmmin, &target_shminfo->shmmin);
    __put_user(host_shminfo->shmmni, &target_shminfo->shmmni);
    __put_user(host_shminfo->shmseg, &target_shminfo->shmseg);
    __put_user(host_shminfo->shmall, &target_shminfo->shmall);
    unlock_user_struct(target_shminfo, target_addr, 1);
    return 0;
}

struct target_shm_info {
    int used_ids;
    abi_ulong shm_tot;
    abi_ulong shm_rss;