LXR qemu/linux-user/fd-trans.h

   1/*
   2 *  This program is free software; you can redistribute it and/or modify
   3 *  it under the terms of the GNU General Public License as published by
   4 *  the Free Software Foundation; either version 2 of the License, or
   5 *  (at your option) any later version.
   6 *
   7 *  This program is distributed in the hope that it will be useful,
   8 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   9 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10 *  GNU General Public License for more details.
  11 *
  12 *  You should have received a copy of the GNU General Public License
  13 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  14 */
  15
  16#ifndef FD_TRANS_H
  17#define FD_TRANS_H
  18
  19#include "qemu/lockable.h"
  20
  21typedef abi_long (*TargetFdDataFunc)(void *, size_t);
  22typedef abi_long (*TargetFdAddrFunc)(void *, abi_ulong, socklen_t);
  23typedef struct TargetFdTrans {
  24    TargetFdDataFunc host_to_target_data;
  25    TargetFdDataFunc target_to_host_data;
  26    TargetFdAddrFunc target_to_host_addr;
  27} TargetFdTrans;
  28
  29extern TargetFdTrans **target_fd_trans;
  30extern QemuMutex target_fd_trans_lock;
  31
  32extern unsigned int target_fd_max;
  33
  34static inline void fd_trans_init(void)
  35{
  36    qemu_mutex_init(&target_fd_trans_lock);
  37}
  38
  39static inline TargetFdDataFunc fd_trans_target_to_host_data(int fd)
  40{
  41    if (fd < 0) {
  42        return NULL;
  43    }
  44
  45    QEMU_LOCK_GUARD(&target_fd_trans_lock);
  46    if (fd < target_fd_max && target_fd_trans[fd]) {
  47        return target_fd_trans[fd]->target_to_host_data;
  48    }
  49    return NULL;
  50}
  51
  52static inline TargetFdDataFunc fd_trans_host_to_target_data(int fd)
  53{
  54    if (fd < 0) {
  55        return NULL;
  56    }
  57
  58    QEMU_LOCK_GUARD(&target_fd_trans_lock);
  59    if (fd < target_fd_max && target_fd_trans[fd]) {
  60        return target_fd_trans[fd]->host_to_target_data;
  61    }
  62    return NULL;
  63}
  64
  65static inline TargetFdAddrFunc fd_trans_target_to_host_addr(int fd)
  66{
  67    if (fd < 0) {
  68        return NULL;
  69    }
  70
  71    QEMU_LOCK_GUARD(&target_fd_trans_lock);
  72    if (fd < target_fd_max && target_fd_trans[fd]) {
  73        return target_fd_trans[fd]->target_to_host_addr;
  74    }
  75    return NULL;
  76}
  77
  78static inline void internal_fd_trans_register_unsafe(int fd,
  79                                                     TargetFdTrans *trans)
  80{
  81    unsigned int oldmax;
  82
  83    if (fd >= target_fd_max) {
  84        oldmax = target_fd_max;
  85        target_fd_max = ((fd >> 6) + 1) << 6; /* by slice of 64 entries */
  86        target_fd_trans = g_renew(TargetFdTrans *,
  87                                  target_fd_trans, target_fd_max);
  88        memset((void *)(target_fd_trans + oldmax), 0,
  89               (target_fd_max - oldmax) * sizeof(TargetFdTrans *));
  90    }
  91    target_fd_trans[fd] = trans;
  92}
  93
  94static inline void fd_trans_register(int fd, TargetFdTrans *trans)
  95{
  96    QEMU_LOCK_GUARD(&target_fd_trans_lock);
  97    internal_fd_trans_register_unsafe(fd, trans);
  98}
  99
 100static inline void internal_fd_trans_unregister_unsafe(int fd)
 101{
 102    if (fd >= 0 && fd < target_fd_max) {
 103        target_fd_trans[fd] = NULL;
 104    }
 105}
 106
 107static inline void fd_trans_unregister(int fd)
 108{
 109    if (fd < 0) {
 110        return;
 111    }
 112
 113    QEMU_LOCK_GUARD(&target_fd_trans_lock);
 114    internal_fd_trans_unregister_unsafe(fd);
 115}
 116
 117static inline void fd_trans_dup(int oldfd, int newfd)
 118{
 119    QEMU_LOCK_GUARD(&target_fd_trans_lock);
 120    internal_fd_trans_unregister_unsafe(newfd);
 121    if (oldfd < target_fd_max && target_fd_trans[oldfd]) {
 122        internal_fd_trans_register_unsafe(newfd, target_fd_trans[oldfd]);
 123    }
 124}
 125
 126extern TargetFdTrans target_packet_trans;
 127#ifdef CONFIG_RTNETLINK
 128extern TargetFdTrans target_netlink_route_trans;
 129#endif
 130extern TargetFdTrans target_netlink_audit_trans;
 131extern TargetFdTrans target_signalfd_trans;
 132extern TargetFdTrans target_eventfd_trans;
 133#if (defined(TARGET_NR_inotify_init) && defined(__NR_inotify_init)) || \
 134    (defined(CONFIG_INOTIFY1) && defined(TARGET_NR_inotify_init1) && \
 135     defined(__NR_inotify_init1))
 136extern TargetFdTrans target_inotify_trans;
 137#endif
 138#endif
 139