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 defined __UCLIBC_HAS_LFS__ && __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 90 /* fsync(2). */ 91 CANCELABLE_SYSCALL (int, fsync, (int fd), (fd)) 92 93 94 /* lseek(2). */ 95 CANCELABLE_SYSCALL (off_t, lseek, (int fd, off_t offset, int whence), 96 (fd, offset, whence)) 97 98 #ifdef __UCLIBC_HAS_LFS__ 99 /* lseek64(2). */ 100 CANCELABLE_SYSCALL (off64_t, lseek64, (int fd, off64_t offset, int whence), 101 (fd, offset, whence)) 102 #endif 103 104 #if defined(__NR_msync) && defined(__ARCH_USE_MMU__) 105 106 /* msync(2). */ 107 CANCELABLE_SYSCALL (int, msync, (void *addr, size_t length, int flags), 108 (addr, length, flags)) 109 #endif 110 111 112 /* nanosleep(2). */ 113 libpthread_hidden_proto(nanosleep) 114 CANCELABLE_SYSCALL (int, nanosleep, (const struct timespec *requested_time, 115 struct timespec *remaining), 116 (requested_time, remaining)) 117 libpthread_hidden_def(nanosleep) 118 119 120 /* open(2). */ 121 CANCELABLE_SYSCALL_VA (int, open, (const char *pathname, int flags, ...), 122 (pathname, flags, va_arg (ap, mode_t)), flags) 123 124 125 #ifdef __UCLIBC_HAS_LFS__ 126 /* open64(3). */ 127 CANCELABLE_SYSCALL_VA (int, open64, (const char *pathname, int flags, ...), 128 (pathname, flags, va_arg (ap, mode_t)), flags) 129 #endif 130 131 /* pause(2). */ 132 CANCELABLE_SYSCALL (int, pause, (void), ()) 133 134 135 /* Enable this if enabling these in syscalls.c */ 136 /* pread(3). */ 137 CANCELABLE_SYSCALL (ssize_t, pread, (int fd, void *buf, size_t count, 138 off_t offset), 139 (fd, buf, count, offset)) 140 141 142 #if defined __UCLIBC_HAS_LFS__ && defined __NR_pread64 143 /* pread64(3). */ 144 CANCELABLE_SYSCALL (ssize_t, pread64, (int fd, void *buf, size_t count, 145 off64_t offset), 146 (fd, buf, count, offset)) 147 #endif 148 149 /* pwrite(3). */ 150 CANCELABLE_SYSCALL (ssize_t, pwrite, (int fd, const void *buf, size_t n, 151 off_t offset), 152 (fd, buf, n, offset)) 153 154 155 #if defined __UCLIBC_HAS_LFS__ && defined __NR_pwrited64 156 /* pwrite64(3). */ 157 CANCELABLE_SYSCALL (ssize_t, pwrite64, (int fd, const void *buf, size_t n, 158 off64_t offset), 159 (fd, buf, n, offset)) 160 #endif 161 162 /* read(2). */ 163 CANCELABLE_SYSCALL (ssize_t, read, (int fd, void *buf, size_t count), 164 (fd, buf, count)) 165 166 167 /* system(3). */ 168 CANCELABLE_SYSCALL (int, system, (const char *line), (line)) 169 170 171 /* tcdrain(2). */ 172 CANCELABLE_SYSCALL (int, tcdrain, (int fd), (fd)) 173 174 175 /* wait(2). */ 176 CANCELABLE_SYSCALL (__pid_t, wait, (__WAIT_STATUS_DEFN stat_loc), (stat_loc)) 177 178 179 /* waitpid(2). */ 180 libpthread_hidden_proto(waitpid) 181 CANCELABLE_SYSCALL (__pid_t, waitpid, (__pid_t pid, int *stat_loc, 182 int options), 183 (pid, stat_loc, options)) 184 libpthread_hidden_def(waitpid) 185 186 187 /* write(2). */ 188 CANCELABLE_SYSCALL (ssize_t, write, (int fd, const void *buf, size_t n), 189 (fd, buf, n)) 190 191 #if defined __UCLIBC_HAS_SOCKET__ 192 /* The following system calls are thread cancellation points specified 193 in XNS. */ 194 195 /* accept(2). */ 196 CANCELABLE_SYSCALL (int, accept, (int fd, __SOCKADDR_ARG addr, 197 socklen_t *addr_len), 198 (fd, addr, addr_len)) 199 200 /* connect(2). */ 201 CANCELABLE_SYSCALL (int, connect, (int fd, __CONST_SOCKADDR_ARG addr, 202 socklen_t len), 203 (fd, addr, len)) 204 205 /* recv(2). */ 206 CANCELABLE_SYSCALL (ssize_t, recv, (int fd, __ptr_t buf, size_t n, int flags), 207 (fd, buf, n, flags)) 208 209 /* recvfrom(2). */ 210 CANCELABLE_SYSCALL (ssize_t, recvfrom, (int fd, __ptr_t buf, size_t n, int flags, 211 __SOCKADDR_ARG addr, socklen_t *addr_len), 212 (fd, buf, n, flags, addr, addr_len)) 213 214 /* recvmsg(2). */ 215 CANCELABLE_SYSCALL (ssize_t, recvmsg, (int fd, struct msghdr *message, int flags), 216 (fd, message, flags)) 217 218 /* send(2). */ 219 CANCELABLE_SYSCALL (ssize_t, send, (int fd, const __ptr_t buf, size_t n, 220 int flags), 221 (fd, buf, n, flags)) 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)) 233 #endif /* __UCLIBC_HAS_SOCKET__ */ 234 235 #ifdef __UCLIBC_HAS_EPOLL__ 236 # include <sys/epoll.h> 237 # ifdef __NR_epoll_wait 238 CANCELABLE_SYSCALL (int, epoll_wait, (int epfd, struct epoll_event *events, int maxevents, int timeout), 239 (epfd, events, maxevents, timeout)) 240 # endif 241 # ifdef __NR_epoll_pwait 242 CANCELABLE_SYSCALL (int, epoll_pwait, (int epfd, struct epoll_event *events, int maxevents, int timeout, 243 const sigset_t *set), 244 (epfd, events, maxevents, timeout, set)) 245 # endif 246 #endif 247