LXR linux/arch/um/include/shared/os.h

   1/*
   2 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   3 * Licensed under the GPL
   4 */
   5
   6#ifndef __OS_H__
   7#define __OS_H__
   8
   9#include <stdarg.h>
  10#include "irq_user.h"
  11#include "longjmp.h"
  12#include "mm_id.h"
  13#include "sysdep/tls.h"
  14
  15#define CATCH_EINTR(expr) while ((errno = 0, ((expr) < 0)) && (errno == EINTR))
  16
  17#define OS_TYPE_FILE 1
  18#define OS_TYPE_DIR 2
  19#define OS_TYPE_SYMLINK 3
  20#define OS_TYPE_CHARDEV 4
  21#define OS_TYPE_BLOCKDEV 5
  22#define OS_TYPE_FIFO 6
  23#define OS_TYPE_SOCK 7
  24
  25/* os_access() flags */
  26#define OS_ACC_F_OK    0       /* Test for existence.  */
  27#define OS_ACC_X_OK    1       /* Test for execute permission.  */
  28#define OS_ACC_W_OK    2       /* Test for write permission.  */
  29#define OS_ACC_R_OK    4       /* Test for read permission.  */
  30#define OS_ACC_RW_OK   (OS_ACC_W_OK | OS_ACC_R_OK) /* Test for RW permission */
  31
  32/*
  33 * types taken from stat_file() in hostfs_user.c
  34 * (if they are wrong here, they are wrong there...).
  35 */
  36struct uml_stat {
  37        int                ust_dev;        /* device */
  38        unsigned long long ust_ino;        /* inode */
  39        int                ust_mode;       /* protection */
  40        int                ust_nlink;      /* number of hard links */
  41        int                ust_uid;        /* user ID of owner */
  42        int                ust_gid;        /* group ID of owner */
  43        unsigned long long ust_size;       /* total size, in bytes */
  44        int                ust_blksize;    /* blocksize for filesystem I/O */
  45        unsigned long long ust_blocks;     /* number of blocks allocated */
  46        unsigned long      ust_atime;      /* time of last access */
  47        unsigned long      ust_mtime;      /* time of last modification */
  48        unsigned long      ust_ctime;      /* time of last change */
  49};
  50
  51struct openflags {
  52        unsigned int r : 1;
  53        unsigned int w : 1;
  54        unsigned int s : 1;     /* O_SYNC */
  55        unsigned int c : 1;     /* O_CREAT */
  56        unsigned int t : 1;     /* O_TRUNC */
  57        unsigned int a : 1;     /* O_APPEND */
  58        unsigned int e : 1;     /* O_EXCL */
  59        unsigned int cl : 1;    /* FD_CLOEXEC */
  60};
  61
  62#define OPENFLAGS() ((struct openflags) { .r = 0, .w = 0, .s = 0, .c = 0, \
  63                                          .t = 0, .a = 0, .e = 0, .cl = 0 })
  64
  65static inline struct openflags of_read(struct openflags flags)
  66{
  67        flags.r = 1;
  68        return flags;
  69}
  70
  71static inline struct openflags of_write(struct openflags flags)
  72{
  73        flags.w = 1;
  74        return flags;
  75}
  76
  77static inline struct openflags of_rdwr(struct openflags flags)
  78{
  79        return of_read(of_write(flags));
  80}
  81
  82static inline struct openflags of_set_rw(struct openflags flags, int r, int w)
  83{
  84        flags.r = r;
  85        flags.w = w;
  86        return flags;
  87}
  88
  89static inline struct openflags of_sync(struct openflags flags)
  90{
  91        flags.s = 1;
  92        return flags;
  93}
  94
  95static inline struct openflags of_create(struct openflags flags)
  96{
  97        flags.c = 1;
  98        return flags;
  99}
 100
 101static inline struct openflags of_trunc(struct openflags flags)
 102{
 103        flags.t = 1;
 104        return flags;
 105}
 106
 107static inline struct openflags of_append(struct openflags flags)
 108{
 109        flags.a = 1;
 110        return flags;
 111}
 112
 113static inline struct openflags of_excl(struct openflags flags)
 114{
 115        flags.e = 1;
 116        return flags;
 117}
 118
 119static inline struct openflags of_cloexec(struct openflags flags)
 120{
 121        flags.cl = 1;
 122        return flags;
 123}
 124
 125/* file.c */
 126extern int os_stat_file(const char *file_name, struct uml_stat *buf);
 127extern int os_stat_fd(const int fd, struct uml_stat *buf);
 128extern int os_access(const char *file, int mode);
 129extern int os_set_exec_close(int fd);
 130extern int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg);
 131extern int os_get_ifname(int fd, char *namebuf);
 132extern int os_set_slip(int fd);
 133extern int os_mode_fd(int fd, int mode);
 134
 135extern int os_seek_file(int fd, unsigned long long offset);
 136extern int os_open_file(const char *file, struct openflags flags, int mode);
 137extern int os_read_file(int fd, void *buf, int len);
 138extern int os_write_file(int fd, const void *buf, int count);
 139extern int os_file_size(const char *file, unsigned long long *size_out);
 140extern int os_file_modtime(const char *file, unsigned long *modtime);
 141extern int os_pipe(int *fd, int stream, int close_on_exec);
 142extern int os_set_fd_async(int fd);
 143extern int os_clear_fd_async(int fd);
 144extern int os_set_fd_block(int fd, int blocking);
 145extern int os_accept_connection(int fd);
 146extern int os_create_unix_socket(const char *file, int len, int close_on_exec);
 147extern int os_shutdown_socket(int fd, int r, int w);
 148extern void os_close_file(int fd);
 149extern int os_rcv_fd(int fd, int *helper_pid_out);
 150extern int create_unix_socket(char *file, int len, int close_on_exec);
 151extern int os_connect_socket(const char *name);
 152extern int os_file_type(char *file);
 153extern int os_file_mode(const char *file, struct openflags *mode_out);
 154extern int os_lock_file(int fd, int excl);
 155extern void os_flush_stdout(void);
 156extern int os_stat_filesystem(char *path, long *bsize_out,
 157                              long long *blocks_out, long long *bfree_out,
 158                              long long *bavail_out, long long *files_out,
 159                              long long *ffree_out, void *fsid_out,
 160                              int fsid_size, long *namelen_out,
 161                              long *spare_out);
 162extern int os_change_dir(char *dir);
 163extern int os_fchange_dir(int fd);
 164extern unsigned os_major(unsigned long long dev);
 165extern unsigned os_minor(unsigned long long dev);
 166extern unsigned long long os_makedev(unsigned major, unsigned minor);
 167
 168/* start_up.c */
 169extern void os_early_checks(void);
 170extern void can_do_skas(void);
 171extern void os_check_bugs(void);
 172extern void check_host_supports_tls(int *supports_tls, int *tls_min);
 173
 174/* mem.c */
 175extern int create_mem_file(unsigned long long len);
 176
 177/* process.c */
 178extern unsigned long os_process_pc(int pid);
 179extern int os_process_parent(int pid);
 180extern void os_stop_process(int pid);
 181extern void os_kill_process(int pid, int reap_child);
 182extern void os_kill_ptraced_process(int pid, int reap_child);
 183extern long os_ptrace_ldt(long pid, long addr, long data);
 184
 185extern int os_getpid(void);
 186extern int os_getpgrp(void);
 187
 188extern void init_new_thread_signals(void);
 189extern int run_kernel_thread(int (*fn)(void *), void *arg, jmp_buf **jmp_ptr);
 190
 191extern int os_map_memory(void *virt, int fd, unsigned long long off,
 192                         unsigned long len, int r, int w, int x);
 193extern int os_protect_memory(void *addr, unsigned long len,
 194                             int r, int w, int x);
 195extern int os_unmap_memory(void *addr, int len);
 196extern int os_drop_memory(void *addr, int length);
 197extern int can_drop_memory(void);
 198extern void os_flush_stdout(void);
 199
 200/* uaccess.c */
 201extern unsigned long __do_user_copy(void *to, const void *from, int n,
 202                                    void **fault_addr, jmp_buf **fault_catcher,
 203                                    void (*op)(void *to, const void *from,
 204                                               int n), int *faulted_out);
 205
 206/* execvp.c */
 207extern int execvp_noalloc(char *buf, const char *file, char *const argv[]);
 208/* helper.c */
 209extern int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv);
 210extern int run_helper_thread(int (*proc)(void *), void *arg,
 211                             unsigned int flags, unsigned long *stack_out);
 212extern int helper_wait(int pid);
 213
 214
 215/* tls.c */
 216extern int os_set_thread_area(user_desc_t *info, int pid);
 217extern int os_get_thread_area(user_desc_t *info, int pid);
 218
 219/* umid.c */
 220extern int umid_file_name(char *name, char *buf, int len);
 221extern int set_umid(char *name);
 222extern char *get_umid(void);
 223
 224/* signal.c */
 225extern void timer_init(void);
 226extern void set_sigstack(void *sig_stack, int size);
 227extern void remove_sigstack(void);
 228extern void set_handler(int sig, void (*handler)(int), int flags, ...);
 229extern int change_sig(int signal, int on);
 230extern void block_signals(void);
 231extern void unblock_signals(void);
 232extern int get_signals(void);
 233extern int set_signals(int enable);
 234
 235/* util.c */
 236extern void stack_protections(unsigned long address);
 237extern int raw(int fd);
 238extern void setup_machinename(char *machine_out);
 239extern void setup_hostinfo(char *buf, int len);
 240extern void os_dump_core(void) __attribute__ ((noreturn));
 241
 242/* time.c */
 243extern void idle_sleep(unsigned long long nsecs);
 244extern int set_interval(void);
 245extern int timer_one_shot(int ticks);
 246extern long long disable_timer(void);
 247extern void uml_idle_timer(void);
 248extern long long os_nsecs(void);
 249
 250/* skas/mem.c */
 251extern long run_syscall_stub(struct mm_id * mm_idp,
 252                             int syscall, unsigned long *args, long expected,
 253                             void **addr, int done);
 254extern long syscall_stub_data(struct mm_id * mm_idp,
 255                              unsigned long *data, int data_count,
 256                              void **addr, void **stub_addr);
 257extern int map(struct mm_id * mm_idp, unsigned long virt,
 258               unsigned long len, int prot, int phys_fd,
 259               unsigned long long offset, int done, void **data);
 260extern int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
 261                 int done, void **data);
 262extern int protect(struct mm_id * mm_idp, unsigned long addr,
 263                   unsigned long len, unsigned int prot, int done, void **data);
 264
 265/* skas/process.c */
 266extern int is_skas_winch(int pid, int fd, void *data);
 267extern int start_userspace(unsigned long stub_stack);
 268extern int copy_context_skas0(unsigned long stack, int pid);
 269extern void userspace(struct uml_pt_regs *regs);
 270extern int map_stub_pages(int fd, unsigned long code, unsigned long data,
 271                          unsigned long stack);
 272extern void new_thread(void *stack, jmp_buf *buf, void (*handler)(void));
 273extern void switch_threads(jmp_buf *me, jmp_buf *you);
 274extern int start_idle_thread(void *stack, jmp_buf *switch_buf);
 275extern void initial_thread_cb_skas(void (*proc)(void *),
 276                                 void *arg);
 277extern void halt_skas(void);
 278extern void reboot_skas(void);
 279
 280/* irq.c */
 281extern int os_waiting_for_events(struct irq_fd *active_fds);
 282extern int os_create_pollfd(int fd, int events, void *tmp_pfd, int size_tmpfds);
 283extern void os_free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg,
 284                struct irq_fd *active_fds, struct irq_fd ***last_irq_ptr2);
 285extern void os_free_irq_later(struct irq_fd *active_fds,
 286                int irq, void *dev_id);
 287extern int os_get_pollfd(int i);
 288extern void os_set_pollfd(int i, int fd);
 289extern void os_set_ioignore(void);
 290
 291/* sigio.c */
 292extern int add_sigio_fd(int fd);
 293extern int ignore_sigio_fd(int fd);
 294extern void maybe_sigio_broken(int fd, int read);
 295extern void sigio_broken(int fd, int read);
 296
 297/* sys-x86_64/prctl.c */
 298extern int os_arch_prctl(int pid, int code, unsigned long *addr);
 299
 300/* tty.c */
 301extern int get_pty(void);
 302
 303/* sys-$ARCH/task_size.c */
 304extern unsigned long os_get_top_address(void);
 305
 306#endif
 307