wrapsyscall.c 7.2 KB

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