linuxthreads/wrapsyscall.c

   1 /* Wrapper arpund system calls to provide cancelation points.
   2    Copyright (C) 1996,1997,1998,1999,2000,2001 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include <fcntl.h>
  22 #include <sys/mman.h>
  23 #include <pthread.h>
  24 #include <unistd.h>
  25 #include <stdarg.h>
  26 #include <stddef.h>
  27 #include <stdlib.h>
  28 #include <termios.h>
  29 #include <sys/resource.h>
  30 #include <sys/wait.h>
  31 #include <sys/socket.h>
  32
  33
  34 #ifndef SHARED
  35 /* We need a hook to force this file to be linked in when static
  36    libpthread is used.  */
  37 const int __pthread_provide_wrappers = 0;
  38 #endif
  39
  40
  41 #define CANCELABLE_SYSCALL(res_type, name, param_list, params) \
  42 res_type __libc_##name param_list;                                            \
  43 res_type                                                                      \
  44 __attribute__ ((weak))                                                        \
  45 name param_list                                                               \
  46 {                                                                             \
  47   res_type result;                                                            \
  48   int oldtype;                                                                \
  49   pthread_setcanceltype (PTHREAD_CANCEL_ASYNCHRONOUS, &oldtype);              \
  50   result = __libc_##name params;                                              \
  51   pthread_setcanceltype (oldtype, NULL);                                      \
  52   return result;                                                              \
  53 }
  54
  55 #define CANCELABLE_SYSCALL_VA(res_type, name, param_list, params, last_arg) \
  56 res_type __libc_##name param_list;                                            \
  57 res_type                                                                      \
  58 __attribute__ ((weak))                                                        \
  59 name param_list                                                               \
  60 {                                                                             \
  61   res_type result;                                                            \
  62   int oldtype;                                                                \
  63   va_list ap;                                                                 \
  64   pthread_setcanceltype (PTHREAD_CANCEL_ASYNCHRONOUS, &oldtype);              \
  65   va_start (ap, last_arg);                                                    \
  66   result = __libc_##name params;                                              \
  67   va_end (ap);                                                                \
  68   pthread_setcanceltype (oldtype, NULL);                                      \
  69   return result;                                                              \
  70 }
  71
  72
  73 /* close(2).  */
  74 CANCELABLE_SYSCALL (int, close, (int fd), (fd))
  75 strong_alias (close, __close)
  76
  77
  78 /* fcntl(2).  */
  79 CANCELABLE_SYSCALL_VA (int, fcntl, (int fd, int cmd, ...),
  80                        (fd, cmd, va_arg (ap, long int)), cmd)
  81 strong_alias (fcntl, __fcntl)
  82
  83
  84 /* fsync(2).  */
  85 CANCELABLE_SYSCALL (int, fsync, (int fd), (fd))
  86
  87
  88 /* lseek(2).  */
  89 CANCELABLE_SYSCALL (off_t, lseek, (int fd, off_t offset, int whence),
  90                     (fd, offset, whence))
  91 strong_alias (lseek, __lseek)
  92
  93
  94 /* lseek64(2).  */
  95 CANCELABLE_SYSCALL (off64_t, lseek64, (int fd, off64_t offset, int whence),
  96                     (fd, offset, whence))
  97
  98
  99 /* msync(2).  */
 100 CANCELABLE_SYSCALL (int, msync, (__ptr_t addr, size_t length, int flags),
 101                     (addr, length, flags))
 102
 103
 104 /* nanosleep(2).  */
 105 CANCELABLE_SYSCALL (int, nanosleep, (const struct timespec *requested_time,
 106                                      struct timespec *remaining),
 107                     (requested_time, remaining))
 108
 109
 110 /* open(2).  */
 111 CANCELABLE_SYSCALL_VA (int, open, (const char *pathname, int flags, ...),
 112                        (pathname, flags, va_arg (ap, mode_t)), flags)
 113 strong_alias (open, __open)
 114
 115
 116 /* open64(3).  */
 117 CANCELABLE_SYSCALL_VA (int, open64, (const char *pathname, int flags, ...),
 118                        (pathname, flags, va_arg (ap, mode_t)), flags)
 119 strong_alias (open64, __open64)
 120
 121
 122 /* pause(2).  */
 123 CANCELABLE_SYSCALL (int, pause, (void), ())
 124
 125
 126 /* pread(3).  */
 127 CANCELABLE_SYSCALL (ssize_t, pread, (int fd, void *buf, size_t count,
 128                                      off_t offset),
 129                     (fd, buf, count, offset))
 130
 131
 132 /* pread64(3).  */
 133 CANCELABLE_SYSCALL (ssize_t, pread64, (int fd, void *buf, size_t count,
 134                                        off64_t offset),
 135                     (fd, buf, count, offset))
 136 strong_alias (pread64, __pread64)
 137
 138
 139 /* pwrite(3).  */
 140 CANCELABLE_SYSCALL (ssize_t, pwrite, (int fd, const void *buf, size_t n,
 141                                       off_t offset),
 142                     (fd, buf, n, offset))
 143
 144
 145 /* pwrite64(3).  */
 146 CANCELABLE_SYSCALL (ssize_t, pwrite64, (int fd, const void *buf, size_t n,
 147                                         off64_t offset),
 148                     (fd, buf, n, offset))
 149 strong_alias (pwrite64, __pwrite64)
 150
 151
 152 /* read(2).  */
 153 CANCELABLE_SYSCALL (ssize_t, read, (int fd, void *buf, size_t count),
 154                     (fd, buf, count))
 155 strong_alias (read, __read)
 156
 157
 158 /* system(3).  */
 159 CANCELABLE_SYSCALL (int, system, (const char *line), (line))
 160
 161
 162 /* tcdrain(2).  */
 163 CANCELABLE_SYSCALL (int, tcdrain, (int fd), (fd))
 164
 165
 166 /* wait(2).  */
 167 CANCELABLE_SYSCALL (__pid_t, wait, (__WAIT_STATUS_DEFN stat_loc), (stat_loc))
 168 strong_alias (wait, __wait)
 169
 170
 171 /* waitpid(2).  */
 172 CANCELABLE_SYSCALL (__pid_t, waitpid, (__pid_t pid, int *stat_loc,
 173                                        int options),
 174                     (pid, stat_loc, options))
 175
 176
 177 /* write(2).  */
 178 CANCELABLE_SYSCALL (ssize_t, write, (int fd, const void *buf, size_t n),
 179                     (fd, buf, n))
 180 strong_alias (write, __write)
 181
 182
 183 /* The following system calls are thread cancellation points specified
 184    in XNS.  */
 185
 186 /* accept(2).  */
 187 CANCELABLE_SYSCALL (int, accept, (int fd, __SOCKADDR_ARG addr,
 188                                   socklen_t *addr_len),
 189                     (fd, addr, addr_len))
 190
 191 /* connect(2).  */
 192 CANCELABLE_SYSCALL (int, connect, (int fd, __CONST_SOCKADDR_ARG addr,
 193                                      socklen_t len),
 194                     (fd, addr, len))
 195 strong_alias (connect, __connect)
 196
 197 /* recv(2).  */
 198 CANCELABLE_SYSCALL (ssize_t, recv, (int fd, __ptr_t buf, size_t n, int flags),
 199                     (fd, buf, n, flags))
 200
 201 /* recvfrom(2).  */
 202 CANCELABLE_SYSCALL (ssize_t, recvfrom, (int fd, __ptr_t buf, size_t n, int flags,
 203                                         __SOCKADDR_ARG addr, socklen_t *addr_len),
 204                     (fd, buf, n, flags, addr, addr_len))
 205
 206 /* recvmsg(2).  */
 207 CANCELABLE_SYSCALL (ssize_t, recvmsg, (int fd, struct msghdr *message, int flags),
 208                     (fd, message, flags))
 209
 210 /* send(2).  */
 211 CANCELABLE_SYSCALL (ssize_t, send, (int fd, const __ptr_t buf, size_t n,
 212                                     int flags),
 213                     (fd, buf, n, flags))
 214 strong_alias (send, __send)
 215
 216 /* sendmsg(2).  */
 217 CANCELABLE_SYSCALL (ssize_t, sendmsg, (int fd, const struct msghdr *message,
 218                                        int flags),
 219                     (fd, message, flags))
 220
 221 /* sendto(2).  */
 222 CANCELABLE_SYSCALL (ssize_t, sendto, (int fd, const __ptr_t buf, size_t n,
 223                                       int flags, __CONST_SOCKADDR_ARG addr,
 224                                       socklen_t addr_len),
 225                     (fd, buf, n, flags, addr, addr_len))