wrapsyscall.c 6.6 KB

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  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. The GNU C Library is free software; you can redistribute it and/or
  6. modify it under the terms of the GNU Library General Public License as
  7. published by the Free Software Foundation; either version 2 of the
  8. License, or (at your option) any later version.
  9. The GNU C Library is distributed in the hope that it will be useful,
  10. but WITHOUT ANY WARRANTY; without even the implied warranty of
  11. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12. Library General Public License for more details.
  13. You should have received a copy of the GNU Library General Public
  14. License along with the GNU C Library; see the file COPYING.LIB. If not,
  15. write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16. Boston, MA 02111-1307, USA. */
  17. #define __FORCE_GLIBC
  18. #include <features.h>
  19. #include <fcntl.h>
  20. #include <sys/mman.h>
  21. #include <pthread.h>
  22. #include <unistd.h>
  23. #include <stdarg.h>
  24. #include <stddef.h>
  25. #include <stdlib.h>
  26. #include <termios.h>
  27. #include <sys/resource.h>
  28. #include <sys/wait.h>
  29. #include <sys/socket.h>
  30. #include <sys/syscall.h>
  31. #ifndef __PIC__
  32. /* We need a hook to force this file to be linked in when static
  33. libpthread is used. */
  34. const char __pthread_provide_wrappers = 0;
  35. #endif
  36. /* Using private interface to libc (__libc_foo) to implement
  37. * cancellable versions of some libc functions */
  38. #define CANCELABLE_SYSCALL(res_type, name, param_list, params) \
  39. res_type __libc_##name param_list; \
  40. res_type \
  41. __attribute__ ((weak)) \
  42. name param_list \
  43. { \
  44. res_type result; \
  45. int oldtype; \
  46. pthread_setcanceltype (PTHREAD_CANCEL_ASYNCHRONOUS, &oldtype); \
  47. result = __libc_##name params; \
  48. pthread_setcanceltype (oldtype, NULL); \
  49. return result; \
  50. }
  51. #define CANCELABLE_SYSCALL_VA(res_type, name, param_list, params, last_arg) \
  52. res_type __libc_##name param_list; \
  53. res_type \
  54. __attribute__ ((weak)) \
  55. name param_list \
  56. { \
  57. res_type result; \
  58. int oldtype; \
  59. va_list ap; \
  60. pthread_setcanceltype (PTHREAD_CANCEL_ASYNCHRONOUS, &oldtype); \
  61. va_start (ap, last_arg); \
  62. result = __libc_##name params; \
  63. va_end (ap); \
  64. pthread_setcanceltype (oldtype, NULL); \
  65. return result; \
  66. }
  67. /* close(2). */
  68. CANCELABLE_SYSCALL (int, close, (int fd), (fd))
  69. /* fcntl(2). */
  70. CANCELABLE_SYSCALL_VA (int, fcntl, (int fd, int cmd, ...),
  71. (fd, cmd, va_arg (ap, long int)), cmd)
  72. /* fsync(2). */
  73. CANCELABLE_SYSCALL (int, fsync, (int fd), (fd))
  74. /* lseek(2). */
  75. CANCELABLE_SYSCALL (off_t, lseek, (int fd, off_t offset, int whence),
  76. (fd, offset, whence))
  77. #ifdef __UCLIBC_HAS_LFS__
  78. /* lseek64(2). */
  79. CANCELABLE_SYSCALL (off64_t, lseek64, (int fd, off64_t offset, int whence),
  80. (fd, offset, whence))
  81. #endif
  82. #if defined(__NR_msync) && defined(__ARCH_USE_MMU__)
  83. /* msync(2). */
  84. CANCELABLE_SYSCALL (int, msync, (void *addr, size_t length, int flags),
  85. (addr, length, flags))
  86. #endif
  87. /* nanosleep(2). */
  88. libpthread_hidden_proto(nanosleep)
  89. CANCELABLE_SYSCALL (int, nanosleep, (const struct timespec *requested_time,
  90. struct timespec *remaining),
  91. (requested_time, remaining))
  92. libpthread_hidden_def(nanosleep)
  93. /* open(2). */
  94. CANCELABLE_SYSCALL_VA (int, open, (const char *pathname, int flags, ...),
  95. (pathname, flags, va_arg (ap, mode_t)), flags)
  96. #ifdef __UCLIBC_HAS_LFS__
  97. /* open64(3). */
  98. CANCELABLE_SYSCALL_VA (int, open64, (const char *pathname, int flags, ...),
  99. (pathname, flags, va_arg (ap, mode_t)), flags)
  100. #endif
  101. /* pause(2). */
  102. CANCELABLE_SYSCALL (int, pause, (void), ())
  103. /* Enable this if enabling these in syscalls.c */
  104. /* pread(3). */
  105. CANCELABLE_SYSCALL (ssize_t, pread, (int fd, void *buf, size_t count,
  106. off_t offset),
  107. (fd, buf, count, offset))
  108. #if defined __UCLIBC_HAS_LFS__ && defined __NR_pread64
  109. /* pread64(3). */
  110. CANCELABLE_SYSCALL (ssize_t, pread64, (int fd, void *buf, size_t count,
  111. off64_t offset),
  112. (fd, buf, count, offset))
  113. #endif
  114. /* pwrite(3). */
  115. CANCELABLE_SYSCALL (ssize_t, pwrite, (int fd, const void *buf, size_t n,
  116. off_t offset),
  117. (fd, buf, n, offset))
  118. #if defined __UCLIBC_HAS_LFS__ && defined __NR_pwrited64
  119. /* pwrite64(3). */
  120. CANCELABLE_SYSCALL (ssize_t, pwrite64, (int fd, const void *buf, size_t n,
  121. off64_t offset),
  122. (fd, buf, n, offset))
  123. #endif
  124. /* read(2). */
  125. CANCELABLE_SYSCALL (ssize_t, read, (int fd, void *buf, size_t count),
  126. (fd, buf, count))
  127. /* system(3). */
  128. CANCELABLE_SYSCALL (int, system, (const char *line), (line))
  129. /* tcdrain(2). */
  130. CANCELABLE_SYSCALL (int, tcdrain, (int fd), (fd))
  131. /* wait(2). */
  132. CANCELABLE_SYSCALL (__pid_t, wait, (__WAIT_STATUS_DEFN stat_loc), (stat_loc))
  133. /* waitpid(2). */
  134. libpthread_hidden_proto(waitpid)
  135. CANCELABLE_SYSCALL (__pid_t, waitpid, (__pid_t pid, int *stat_loc,
  136. int options),
  137. (pid, stat_loc, options))
  138. libpthread_hidden_def(waitpid)
  139. /* write(2). */
  140. CANCELABLE_SYSCALL (ssize_t, write, (int fd, const void *buf, size_t n),
  141. (fd, buf, n))
  142. #if defined __UCLIBC_HAS_SOCKET__
  143. /* The following system calls are thread cancellation points specified
  144. in XNS. */
  145. /* accept(2). */
  146. CANCELABLE_SYSCALL (int, accept, (int fd, __SOCKADDR_ARG addr,
  147. socklen_t *addr_len),
  148. (fd, addr, addr_len))
  149. /* connect(2). */
  150. CANCELABLE_SYSCALL (int, connect, (int fd, __CONST_SOCKADDR_ARG addr,
  151. socklen_t len),
  152. (fd, addr, len))
  153. /* recv(2). */
  154. CANCELABLE_SYSCALL (ssize_t, recv, (int fd, __ptr_t buf, size_t n, int flags),
  155. (fd, buf, n, flags))
  156. /* recvfrom(2). */
  157. CANCELABLE_SYSCALL (ssize_t, recvfrom, (int fd, __ptr_t buf, size_t n, int flags,
  158. __SOCKADDR_ARG addr, socklen_t *addr_len),
  159. (fd, buf, n, flags, addr, addr_len))
  160. /* recvmsg(2). */
  161. CANCELABLE_SYSCALL (ssize_t, recvmsg, (int fd, struct msghdr *message, int flags),
  162. (fd, message, flags))
  163. /* send(2). */
  164. CANCELABLE_SYSCALL (ssize_t, send, (int fd, const __ptr_t buf, size_t n,
  165. int flags),
  166. (fd, buf, n, flags))
  167. /* sendmsg(2). */
  168. CANCELABLE_SYSCALL (ssize_t, sendmsg, (int fd, const struct msghdr *message,
  169. int flags),
  170. (fd, message, flags))
  171. /* sendto(2). */
  172. CANCELABLE_SYSCALL (ssize_t, sendto, (int fd, const __ptr_t buf, size_t n,
  173. int flags, __CONST_SOCKADDR_ARG addr,
  174. socklen_t addr_len),
  175. (fd, buf, n, flags, addr, addr_len))
  176. #endif /* __UCLIBC_HAS_SOCKET__ */