linuxthreads/wrapsyscall.c

   1 /* Wrapper arpund system calls to provide cancelation points.
   2    Copyright (C) 1996-1999,2000-2002 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 Lesser General Public License as
   8    published by the Free Software Foundation; either version 2.1 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    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser 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 #define PROMOTE_INTEGRAL_TYPE(type) __typeof__ ((type) 0 + 0)
  73
  74
  75 /* close(2).  */
  76 CANCELABLE_SYSCALL (int, close, (int fd), (fd))
  77 strong_alias (close, __close)
  78
  79
  80 /* fcntl(2).  */
  81 CANCELABLE_SYSCALL_VA (int, fcntl, (int fd, int cmd, ...),
  82                        (fd, cmd, va_arg (ap, long int)), cmd)
  83 strong_alias (fcntl, __fcntl)
  84
  85
  86 /* fsync(2).  */
  87 CANCELABLE_SYSCALL (int, fsync, (int fd), (fd))
  88
  89
  90 /* lseek(2).  */
  91 CANCELABLE_SYSCALL (off_t, lseek, (int fd, off_t offset, int whence),
  92                     (fd, offset, whence))
  93 strong_alias (lseek, __lseek)
  94
  95
  96 /* lseek64(2).  */
  97 CANCELABLE_SYSCALL (off64_t, lseek64, (int fd, off64_t offset, int whence),
  98                     (fd, offset, whence))
  99
 100
 101 /* msync(2).  */
 102 CANCELABLE_SYSCALL (int, msync, (__ptr_t addr, size_t length, int flags),
 103                     (addr, length, flags))
 104
 105
 106 /* nanosleep(2).  */
 107 CANCELABLE_SYSCALL (int, nanosleep, (const struct timespec *requested_time,
 108                                      struct timespec *remaining),
 109                     (requested_time, remaining))
 110 strong_alias (nanosleep, __nanosleep)
 111
 112
 113 /* open(2).  */
 114 CANCELABLE_SYSCALL_VA (int, open, (const char *pathname, int flags, ...),
 115                        (pathname, flags,
 116                         va_arg (ap, PROMOTE_INTEGRAL_TYPE (mode_t))),
 117                        flags)
 118 strong_alias (open, __open)
 119
 120
 121 /* open64(3).  */
 122 CANCELABLE_SYSCALL_VA (int, open64, (const char *pathname, int flags, ...),
 123                        (pathname, flags,
 124                         va_arg (ap, PROMOTE_INTEGRAL_TYPE (mode_t))),
 125                        flags)
 126 strong_alias (open64, __open64)
 127
 128
 129 /* pause(2).  */
 130 CANCELABLE_SYSCALL (int, pause, (void), ())
 131
 132
 133 /* pread(3).  */
 134 CANCELABLE_SYSCALL (ssize_t, pread, (int fd, void *buf, size_t count,
 135                                      off_t offset),
 136                     (fd, buf, count, offset))
 137
 138
 139 /* pread64(3).  */
 140 CANCELABLE_SYSCALL (ssize_t, pread64, (int fd, void *buf, size_t count,
 141                                        off64_t offset),
 142                     (fd, buf, count, offset))
 143 strong_alias (pread64, __pread64)
 144
 145
 146 /* pwrite(3).  */
 147 CANCELABLE_SYSCALL (ssize_t, pwrite, (int fd, const void *buf, size_t n,
 148                                       off_t offset),
 149                     (fd, buf, n, offset))
 150
 151
 152 /* pwrite64(3).  */
 153 CANCELABLE_SYSCALL (ssize_t, pwrite64, (int fd, const void *buf, size_t n,
 154                                         off64_t offset),
 155                     (fd, buf, n, offset))
 156 strong_alias (pwrite64, __pwrite64)
 157
 158
 159 /* read(2).  */
 160 CANCELABLE_SYSCALL (ssize_t, read, (int fd, void *buf, size_t count),
 161                     (fd, buf, count))
 162 strong_alias (read, __read)
 163
 164
 165 /* system(3).  */
 166 CANCELABLE_SYSCALL (int, system, (const char *line), (line))
 167
 168
 169 /* tcdrain(2).  */
 170 CANCELABLE_SYSCALL (int, tcdrain, (int fd), (fd))
 171
 172
 173 /* wait(2).  */
 174 CANCELABLE_SYSCALL (__pid_t, wait, (__WAIT_STATUS_DEFN stat_loc), (stat_loc))
 175 strong_alias (wait, __wait)
 176
 177
 178 /* waitpid(2).  */
 179 CANCELABLE_SYSCALL (__pid_t, waitpid, (__pid_t pid, int *stat_loc,
 180                                        int options),
 181                     (pid, stat_loc, options))
 182
 183
 184 /* write(2).  */
 185 CANCELABLE_SYSCALL (ssize_t, write, (int fd, const void *buf, size_t n),
 186                     (fd, buf, n))
 187 strong_alias (write, __write)
 188
 189
 190 /* The following system calls are thread cancellation points specified
 191    in XNS.  */
 192
 193 /* accept(2).  */
 194 CANCELABLE_SYSCALL (int, accept, (int fd, __SOCKADDR_ARG addr,
 195                                   socklen_t *addr_len),
 196                     (fd, addr, addr_len))
 197
 198 /* connect(2).  */
 199 CANCELABLE_SYSCALL (int, connect, (int fd, __CONST_SOCKADDR_ARG addr,
 200                                      socklen_t len),
 201                     (fd, addr, len))
 202 strong_alias (connect, __connect)
 203
 204 /* recv(2).  */
 205 CANCELABLE_SYSCALL (ssize_t, recv, (int fd, __ptr_t buf, size_t n, int flags),
 206                     (fd, buf, n, flags))
 207
 208 /* recvfrom(2).  */
 209 CANCELABLE_SYSCALL (ssize_t, recvfrom, (int fd, __ptr_t buf, size_t n, int flags,
 210                                         __SOCKADDR_ARG addr, socklen_t *addr_len),
 211                     (fd, buf, n, flags, addr, addr_len))
 212
 213 /* recvmsg(2).  */
 214 CANCELABLE_SYSCALL (ssize_t, recvmsg, (int fd, struct msghdr *message, int flags),
 215                     (fd, message, flags))
 216
 217 /* send(2).  */
 218 CANCELABLE_SYSCALL (ssize_t, send, (int fd, const __ptr_t buf, size_t n,
 219                                     int flags),
 220                     (fd, buf, n, flags))
 221 strong_alias (send, __send)
 222
 223 /* sendmsg(2).  */
 224 CANCELABLE_SYSCALL (ssize_t, sendmsg, (int fd, const struct msghdr *message,
 225                                        int flags),
 226                     (fd, message, flags))
 227
 228 /* sendto(2).  */
 229 CANCELABLE_SYSCALL (ssize_t, sendto, (int fd, const __ptr_t buf, size_t n,
 230                                       int flags, __CONST_SOCKADDR_ARG addr,
 231                                       socklen_t addr_len),
 232                     (fd, buf, n, flags, addr, addr_len))