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
  21 typedef abi_long (*TargetFdDataFunc)(void *, size_t);
  22 typedef abi_long (*TargetFdAddrFunc)(void *, abi_ulong, socklen_t);
  23 typedef struct TargetFdTrans {
  24     TargetFdDataFunc host_to_target_data;
  25     TargetFdDataFunc target_to_host_data;
  26     TargetFdAddrFunc target_to_host_addr;
  27 } TargetFdTrans;
  28
  29 extern TargetFdTrans **target_fd_trans;
  30 extern QemuMutex target_fd_trans_lock;
  31
  32 extern unsigned int target_fd_max;
  33
  34 static inline void fd_trans_init(void)
  35 {
  36     qemu_mutex_init(&target_fd_trans_lock);
  37 }
  38
  39 static 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
  52 static 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
  65 static 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
  78 static 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
  94 static 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
 100 static 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
 107 static 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
 117 static 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
 126 extern TargetFdTrans target_packet_trans;
 127 #ifdef CONFIG_RTNETLINK
 128 extern TargetFdTrans target_netlink_route_trans;
 129 #endif
 130 extern TargetFdTrans target_netlink_audit_trans;
 131 extern TargetFdTrans target_signalfd_trans;
 132 extern 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))
 136 extern TargetFdTrans target_inotify_trans;
 137 #endif
 138 #endif