libpthread/linuxthreads/wrapsyscall.c

   1 /* Wrapper around system calls to provide cancellation 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    see <http://www.gnu.org/licenses/>.  */
  19
  20 #include <fcntl.h>
  21 #include <sys/mman.h>
  22 #include <pthread.h>
  23 #include <unistd.h>
  24 #include <stdarg.h>
  25 #include <stddef.h>
  26 #include <stdlib.h>
  27 #include <termios.h>
  28 #include <sys/epoll.h>
  29 #include <sys/resource.h>
  30 #include <sys/wait.h>
  31 #include <sys/socket.h>
  32 #include <sys/syscall.h>
  33
  34
  35 #ifndef __PIC__
  36 /* We need a hook to force this file to be linked in when static
  37    libpthread is used.  */
  38 const char __pthread_provide_wrappers = 0;
  39 #endif
  40
  41 /* Using private interface to libc (__libc_foo) to implement
  42  * cancellable versions of some libc functions */
  43 #define CANCELABLE_SYSCALL(res_type, name, param_list, params)                  \
  44 res_type __libc_##name param_list;                                              \
  45 res_type                                                                        \
  46 __attribute__ ((weak))                                                          \
  47 name param_list                                                                 \
  48 {                                                                               \
  49   res_type result;                                                              \
  50   int oldtype;                                                                  \
  51   pthread_setcanceltype (PTHREAD_CANCEL_ASYNCHRONOUS, &oldtype);                \
  52   result = __libc_##name params;                                                \
  53   pthread_setcanceltype (oldtype, NULL);                                        \
  54   return result;                                                                \
  55 }
  56
  57 #define CANCELABLE_SYSCALL_VA(res_type, name, param_list, params, last_arg)     \
  58 res_type __libc_##name param_list;                                              \
  59 res_type                                                                        \
  60 __attribute__ ((weak))                                                          \
  61 name param_list                                                                 \
  62 {                                                                               \
  63   res_type result;                                                              \
  64   int oldtype;                                                                  \
  65   va_list ap;                                                                   \
  66   pthread_setcanceltype (PTHREAD_CANCEL_ASYNCHRONOUS, &oldtype);                \
  67   va_start (ap, last_arg);                                                      \
  68   result = __libc_##name params;                                                \
  69   va_end (ap);                                                                  \
  70   pthread_setcanceltype (oldtype, NULL);                                        \
  71   return result;                                                                \
  72 }
  73
  74
  75 /* close(2).  */
  76 CANCELABLE_SYSCALL (int, close, (int fd), (fd))
  77
  78
  79 /* fcntl(2).  */
  80 CANCELABLE_SYSCALL_VA (int, fcntl, (int fd, int cmd, ...),
  81                        (fd, cmd, va_arg (ap, long int)), cmd)
  82
  83 #if __WORDSIZE == 32
  84 /* fcntl64(2).  */
  85 CANCELABLE_SYSCALL_VA (int, fcntl64, (int fd, int cmd, ...),
  86                        (fd, cmd, va_arg (ap, long int)), cmd)
  87 #endif
  88
  89 /* fsync(2).  */
  90 CANCELABLE_SYSCALL (int, fsync, (int fd), (fd))
  91
  92
  93 /* lseek(2).  */
  94 CANCELABLE_SYSCALL (off_t, lseek, (int fd, off_t offset, int whence),
  95                     (fd, offset, whence))
  96
  97 /* lseek64(2).  */
  98 CANCELABLE_SYSCALL (off64_t, lseek64, (int fd, off64_t offset, int whence),
  99                     (fd, offset, whence))
 100
 101 #if defined(__NR_msync) && defined(__ARCH_USE_MMU__)
 102
 103 /* msync(2).  */
 104 CANCELABLE_SYSCALL (int, msync, (void *addr, size_t length, int flags),
 105                     (addr, length, flags))
 106 #endif
 107
 108
 109 /* nanosleep(2).  */
 110 libpthread_hidden_proto(nanosleep)
 111 CANCELABLE_SYSCALL (int, nanosleep, (const struct timespec *requested_time,
 112                                      struct timespec *remaining),
 113                     (requested_time, remaining))
 114 libpthread_hidden_def(nanosleep)
 115
 116
 117 /* open(2).  */
 118 CANCELABLE_SYSCALL_VA (int, open, (const char *pathname, int flags, ...),
 119                        (pathname, flags, va_arg (ap, mode_t)), flags)
 120
 121
 122 /* open64(3).  */
 123 CANCELABLE_SYSCALL_VA (int, open64, (const char *pathname, int flags, ...),
 124                        (pathname, flags, va_arg (ap, mode_t)), flags)
 125
 126 /* pause(2).  */
 127 CANCELABLE_SYSCALL (int, pause, (void), ())
 128
 129
 130 /* Enable this if enabling these in syscalls.c */
 131 /* pread(3).  */
 132 CANCELABLE_SYSCALL (ssize_t, pread, (int fd, void *buf, size_t count,
 133                                      off_t offset),
 134                     (fd, buf, count, offset))
 135
 136
 137 #if defined __NR_pread64
 138 /* pread64(3).  */
 139 CANCELABLE_SYSCALL (ssize_t, pread64, (int fd, void *buf, size_t count,
 140                                        off64_t offset),
 141                     (fd, buf, count, offset))
 142 #endif
 143
 144 /* pwrite(3).  */
 145 CANCELABLE_SYSCALL (ssize_t, pwrite, (int fd, const void *buf, size_t n,
 146                                       off_t offset),
 147                     (fd, buf, n, offset))
 148
 149
 150 #if defined __NR_pwrited64
 151 /* pwrite64(3).  */
 152 CANCELABLE_SYSCALL (ssize_t, pwrite64, (int fd, const void *buf, size_t n,
 153                                         off64_t offset),
 154                     (fd, buf, n, offset))
 155 #endif
 156
 157 /* read(2).  */
 158 CANCELABLE_SYSCALL (ssize_t, read, (int fd, void *buf, size_t count),
 159                     (fd, buf, count))
 160
 161
 162 /* system(3).  */
 163 CANCELABLE_SYSCALL (int, system, (const char *line), (line))
 164
 165
 166 /* tcdrain(2).  */
 167 CANCELABLE_SYSCALL (int, tcdrain, (int fd), (fd))
 168
 169
 170 /* wait(2).  */
 171 CANCELABLE_SYSCALL (__pid_t, wait, (__WAIT_STATUS_DEFN stat_loc), (stat_loc))
 172
 173
 174 /* waitpid(2).  */
 175 libpthread_hidden_proto(waitpid)
 176 CANCELABLE_SYSCALL (__pid_t, waitpid, (__pid_t pid, int *stat_loc,
 177                                        int options),
 178                     (pid, stat_loc, options))
 179 libpthread_hidden_def(waitpid)
 180
 181
 182 /* write(2).  */
 183 CANCELABLE_SYSCALL (ssize_t, write, (int fd, const void *buf, size_t n),
 184                     (fd, buf, n))
 185
 186 #if defined __UCLIBC_HAS_SOCKET__
 187 /* The following system calls are thread cancellation points specified
 188    in XNS.  */
 189
 190 /* accept(2).  */
 191 CANCELABLE_SYSCALL (int, accept, (int fd, __SOCKADDR_ARG addr,
 192                                   socklen_t *addr_len),
 193                     (fd, addr, addr_len))
 194
 195 #if defined __UCLIBC_LINUX_SPECIFIC__
 196 /* accept4(2).  */
 197 CANCELABLE_SYSCALL (int, accept4, (int fd, __SOCKADDR_ARG addr,
 198                                   socklen_t *addr_len, int flags),
 199                     (fd, addr, addr_len, flags))
 200 #endif
 201
 202 /* connect(2).  */
 203 CANCELABLE_SYSCALL (int, connect, (int fd, __CONST_SOCKADDR_ARG addr,
 204                                      socklen_t len),
 205                     (fd, addr, len))
 206
 207 /* recv(2).  */
 208 CANCELABLE_SYSCALL (ssize_t, recv, (int fd, __ptr_t buf, size_t n, int flags),
 209                     (fd, buf, n, flags))
 210
 211 /* recvfrom(2).  */
 212 CANCELABLE_SYSCALL (ssize_t, recvfrom, (int fd, __ptr_t buf, size_t n, int flags,
 213                                         __SOCKADDR_ARG addr, socklen_t *addr_len),
 214                     (fd, buf, n, flags, addr, addr_len))
 215
 216 /* recvmsg(2).  */
 217 CANCELABLE_SYSCALL (ssize_t, recvmsg, (int fd, struct msghdr *message, int flags),
 218                     (fd, message, flags))
 219
 220 /* send(2).  */
 221 CANCELABLE_SYSCALL (ssize_t, send, (int fd, const __ptr_t buf, size_t n,
 222                                     int flags),
 223                     (fd, buf, n, flags))
 224
 225 /* sendmsg(2).  */
 226 CANCELABLE_SYSCALL (ssize_t, sendmsg, (int fd, const struct msghdr *message,
 227                                        int flags),
 228                     (fd, message, flags))
 229
 230 /* sendto(2).  */
 231 CANCELABLE_SYSCALL (ssize_t, sendto, (int fd, const __ptr_t buf, size_t n,
 232                                       int flags, __CONST_SOCKADDR_ARG addr,
 233                                       socklen_t addr_len),
 234                     (fd, buf, n, flags, addr, addr_len))
 235 #endif /* __UCLIBC_HAS_SOCKET__ */
 236
 237 #ifdef  __UCLIBC_HAS_EPOLL__
 238 # include <sys/epoll.h>
 239 # ifdef __NR_epoll_wait
 240 CANCELABLE_SYSCALL (int, epoll_wait, (int epfd, struct epoll_event *events, int maxevents, int timeout),
 241                     (epfd, events, maxevents, timeout))
 242 # endif
 243 # ifdef __NR_epoll_pwait
 244 CANCELABLE_SYSCALL (int, epoll_pwait, (int epfd, struct epoll_event *events, int maxevents, int timeout,
 245                                        const sigset_t *set),
 246                     (epfd, events, maxevents, timeout, set))
 247 # endif
 248 #endif