linuxthreads/wrapsyscall.c

   1 /* Wrapper arpund system calls to provide cancelation points.
   2    Copyright (C) 1996, 1997, 1998 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 PIC
  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 name param_list                                                               \
  45 {                                                                             \
  46   res_type result;                                                            \
  47   int oldtype;                                                                \
  48   pthread_setcanceltype (PTHREAD_CANCEL_ASYNCHRONOUS, &oldtype);              \
  49   result = __libc_##name params;                                              \
  50   pthread_setcanceltype (oldtype, NULL);                                      \
  51   return result;                                                              \
  52 }
  53
  54 #define CANCELABLE_SYSCALL_VA(res_type, name, param_list, params, last_arg) \
  55 res_type __libc_##name param_list;                                            \
  56 res_type                                                                      \
  57 name param_list                                                               \
  58 {                                                                             \
  59   res_type result;                                                            \
  60   int oldtype;                                                                \
  61   va_list ap;                                                                 \
  62   pthread_setcanceltype (PTHREAD_CANCEL_ASYNCHRONOUS, &oldtype);              \
  63   va_start (ap, last_arg);                                                    \
  64   result = __libc_##name params;                                              \
  65   va_end (ap);                                                                \
  66   pthread_setcanceltype (oldtype, NULL);                                      \
  67   return result;                                                              \
  68 }
  69
  70
  71 /* close(2).  */
  72 CANCELABLE_SYSCALL (int, close, (int fd), (fd))
  73 strong_alias (close, __close)
  74
  75
  76 /* fcntl(2).  */
  77 CANCELABLE_SYSCALL_VA (int, fcntl, (int fd, int cmd, ...),
  78                        (fd, cmd, va_arg (ap, long int)), cmd)
  79 strong_alias (fcntl, __fcntl)
  80
  81
  82 /* fsync(2).  */
  83 CANCELABLE_SYSCALL (int, fsync, (int fd), (fd))
  84
  85
  86 /* lseek(2).  */
  87 CANCELABLE_SYSCALL (off_t, lseek, (int fd, off_t offset, int whence),
  88                     (fd, offset, whence))
  89 strong_alias (lseek, __lseek)
  90
  91
  92 /* msync(2).  */
  93 CANCELABLE_SYSCALL (int, msync, (__ptr_t addr, size_t length, int flags),
  94                     (addr, length, flags))
  95
  96
  97 /* nanosleep(2).  */
  98 CANCELABLE_SYSCALL (int, nanosleep, (const struct timespec *requested_time,
  99                                      struct timespec *remaining),
 100                     (requested_time, remaining))
 101
 102
 103 /* open(2).  */
 104 CANCELABLE_SYSCALL_VA (int, open, (const char *pathname, int flags, ...),
 105                        (pathname, flags, va_arg (ap, mode_t)), flags)
 106 strong_alias (open, __open)
 107
 108
 109 /* pause(2).  */
 110 CANCELABLE_SYSCALL (int, pause, (void), ())
 111
 112
 113 /* read(2).  */
 114 CANCELABLE_SYSCALL (ssize_t, read, (int fd, void *buf, size_t count),
 115                     (fd, buf, count))
 116 strong_alias (read, __read)
 117
 118
 119 /* system(3).  */
 120 CANCELABLE_SYSCALL (int, system, (const char *line), (line))
 121
 122
 123 /* tcdrain(2).  */
 124 CANCELABLE_SYSCALL (int, tcdrain, (int fd), (fd))
 125
 126
 127 /* wait(2).  */
 128 CANCELABLE_SYSCALL (__pid_t, wait, (__WAIT_STATUS_DEFN stat_loc), (stat_loc))
 129 strong_alias (wait, __wait)
 130
 131
 132 /* waitpid(2).  */
 133 CANCELABLE_SYSCALL (__pid_t, waitpid, (__pid_t pid, int *stat_loc,
 134                                        int options),
 135                     (pid, stat_loc, options))
 136
 137
 138 /* write(2).  */
 139 CANCELABLE_SYSCALL (ssize_t, write, (int fd, const void *buf, size_t n),
 140                     (fd, buf, n))
 141 strong_alias (write, __write)
 142
 143
 144 /* The following system calls are thread cancellation points specified
 145    in XNS.  */
 146
 147 /* accept(2).  */
 148 CANCELABLE_SYSCALL (int, accept, (int fd, __SOCKADDR_ARG addr,
 149                                   socklen_t *addr_len),
 150                     (fd, addr, addr_len))
 151
 152 /* connect(2).  */
 153 CANCELABLE_SYSCALL (int, connect, (int fd, __CONST_SOCKADDR_ARG addr,
 154                                      socklen_t len),
 155                     (fd, addr, len))
 156 strong_alias (connect, __connect)
 157
 158 /* recv(2).  */
 159 CANCELABLE_SYSCALL (int, recv, (int fd, __ptr_t buf, size_t n, int flags),
 160                     (fd, buf, n, flags))
 161
 162 /* recvfrom(2).  */
 163 CANCELABLE_SYSCALL (int, recvfrom, (int fd, __ptr_t buf, size_t n, int flags,
 164                                     __SOCKADDR_ARG addr, socklen_t *addr_len),
 165                     (fd, buf, n, flags, addr, addr_len))
 166
 167 /* recvmsg(2).  */
 168 CANCELABLE_SYSCALL (int, recvmsg, (int fd, struct msghdr *message, int flags),
 169                     (fd, message, flags))
 170
 171 /* send(2).  */
 172 CANCELABLE_SYSCALL (int, send, (int fd, const __ptr_t buf, size_t n,
 173                                 int flags),
 174                     (fd, buf, n, flags))
 175 strong_alias (send, __send)
 176
 177 /* sendmsg(2).  */
 178 CANCELABLE_SYSCALL (int, sendmsg, (int fd, const struct msghdr *message,
 179                                    int flags),
 180                     (fd, message, flags))
 181
 182 /* sendto(2).  */
 183 CANCELABLE_SYSCALL (int, sendto, (int fd, const __ptr_t buf, size_t n,
 184                                   int flags, __CONST_SOCKADDR_ARG addr,
 185                                   socklen_t addr_len),
 186                     (fd, buf, n, flags, addr, addr_len))