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 249