1 /* 2 * Copyright (c) 2000 Jason Evans <jasone@freebsd.org>. 3 * Copyright (c) 2002 Daniel M. Eischen <deischen@freebsd.org> 4 * Copyright (c) 2003 Jeff Roberson <jeff@freebsd.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice(s), this list of conditions and the following disclaimer as 12 * the first lines of this file unmodified other than the possible 13 * addition of one or more copyright notices. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice(s), this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the 17 * distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY 20 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE 23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 26 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 28 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 29 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 * 31 * $FreeBSD$ 32 */ 33 34 /* 35 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au> 36 * All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. All advertising materials mentioning features or use of this software 47 * must display the following acknowledgement: 48 * This product includes software developed by John Birrell. 49 * 4. Neither the name of the author nor the names of any co-contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 */ 66 67 #include <sys/cdefs.h> 68 #include <sys/fcntl.h> 69 #include <sys/mman.h> 70 #include <sys/param.h> 71 #include <sys/select.h> 72 #include <sys/time.h> 73 #include <sys/types.h> 74 #include <sys/uio.h> 75 #include <sys/wait.h> 76 77 #include <aio.h> 78 #include <dirent.h> 79 #include <errno.h> 80 #include <fcntl.h> 81 #include <poll.h> 82 #include <pthread.h> 83 #include <signal.h> 84 #include <stdarg.h> 85 #include <stdio.h> 86 #include <stdlib.h> 87 #include <string.h> 88 #include <termios.h> 89 #include <unistd.h> 90 91 #include "thr_private.h" 92 93 extern int __creat(const char *, mode_t); 94 extern int __sleep(unsigned int); 95 extern int __sys_nanosleep(const struct timespec *, struct timespec *); 96 extern int __sys_select(int, fd_set *, fd_set *, fd_set *, struct timeval *); 97 extern int __sys_sigaction(int, const struct sigaction *, struct sigaction *); 98 extern int __system(const char *); 99 extern int __tcdrain(int); 100 extern pid_t __wait(int *); 101 extern pid_t __sys_wait4(pid_t, int *, int, struct rusage *); 102 extern pid_t __waitpid(pid_t, int *, int); 103 104 __weak_reference(_aio_suspend, aio_suspend); 105 106 int 107 _aio_suspend(const struct aiocb * const iocbs[], int niocb, const struct 108 timespec *timeout) 109 { 110 int ret; 111 112 _thread_enter_cancellation_point(); 113 ret = __sys_aio_suspend(iocbs, niocb, timeout); 114 _thread_leave_cancellation_point(); 115 116 return ret; 117 } 118 119 __weak_reference(_close, close); 120 121 int 122 _close(int fd) 123 { 124 int ret; 125 126 _thread_enter_cancellation_point(); 127 ret = __sys_close(fd); 128 _thread_leave_cancellation_point(); 129 130 return ret; 131 } 132 __weak_reference(_creat, creat); 133 134 int 135 _creat(const char *path, mode_t mode) 136 { 137 int ret; 138 139 _thread_enter_cancellation_point(); 140 ret = __creat(path, mode); 141 _thread_leave_cancellation_point(); 142 143 return ret; 144 } 145 146 __weak_reference(_fcntl, fcntl); 147 148 int 149 _fcntl(int fd, int cmd,...) 150 { 151 int ret; 152 va_list ap; 153 154 _thread_enter_cancellation_point(); 155 156 va_start(ap, cmd); 157 switch (cmd) { 158 case F_DUPFD: 159 case F_SETFD: 160 case F_SETFL: 161 ret = __sys_fcntl(fd, cmd, va_arg(ap, int)); 162 break; 163 case F_GETFD: 164 case F_GETFL: 165 ret = __sys_fcntl(fd, cmd); 166 break; 167 default: 168 ret = __sys_fcntl(fd, cmd, va_arg(ap, void *)); 169 } 170 va_end(ap); 171 172 _thread_leave_cancellation_point(); 173 174 return ret; 175 } 176 177 __weak_reference(_fsync, fsync); 178 179 int 180 _fsync(int fd) 181 { 182 int ret; 183 184 _thread_enter_cancellation_point(); 185 ret = __sys_fsync(fd); 186 _thread_leave_cancellation_point(); 187 188 return ret; 189 } 190 191 __weak_reference(_msync, msync); 192 193 int 194 _msync(void *addr, size_t len, int flags) 195 { 196 int ret; 197 198 _thread_enter_cancellation_point(); 199 ret = __sys_msync(addr, len, flags); 200 _thread_leave_cancellation_point(); 201 202 return ret; 203 } 204 205 __weak_reference(_nanosleep, nanosleep); 206 207 int 208 _nanosleep(const struct timespec * time_to_sleep, struct timespec * 209 time_remaining) 210 { 211 int ret; 212 213 _thread_enter_cancellation_point(); 214 ret = __sys_nanosleep(time_to_sleep, time_remaining); 215 _thread_leave_cancellation_point(); 216 217 return ret; 218 } 219 220 __weak_reference(_open, open); 221 222 int 223 _open(const char *path, int flags,...) 224 { 225 int ret; 226 int mode = 0; 227 va_list ap; 228 229 _thread_enter_cancellation_point(); 230 231 /* Check if the file is being created: */ 232 if (flags & O_CREAT) { 233 /* Get the creation mode: */ 234 va_start(ap, flags); 235 mode = va_arg(ap, int); 236 va_end(ap); 237 } 238 239 ret = __sys_open(path, flags, mode); 240 _thread_leave_cancellation_point(); 241 242 return ret; 243 } 244 245 __weak_reference(_poll, poll); 246 247 int 248 _poll(struct pollfd *fds, unsigned int nfds, int timeout) 249 { 250 int ret; 251 252 _thread_enter_cancellation_point(); 253 ret = __sys_poll(fds, nfds, timeout); 254 _thread_leave_cancellation_point(); 255 256 return ret; 257 } 258 259 extern int __pselect(int count, fd_set *rfds, fd_set *wfds, fd_set *efds, 260 const struct timespec *timo, const sigset_t *mask); 261 262 int 263 pselect(int count, fd_set *rfds, fd_set *wfds, fd_set *efds, 264 const struct timespec *timo, const sigset_t *mask) 265 { 266 int ret; 267 268 _thread_enter_cancellation_point(); 269 ret = __pselect(count, rfds, wfds, efds, timo, mask); 270 _thread_leave_cancellation_point(); 271 272 return (ret); 273 } 274 275 __weak_reference(_read, read); 276 277 ssize_t 278 _read(int fd, void *buf, size_t nbytes) 279 { 280 ssize_t ret; 281 282 _thread_enter_cancellation_point(); 283 ret = __sys_read(fd, buf, nbytes); 284 _thread_leave_cancellation_point(); 285 286 return ret; 287 } 288 289 __weak_reference(_readv, readv); 290 291 ssize_t 292 _readv(int fd, const struct iovec *iov, int iovcnt) 293 { 294 ssize_t ret; 295 296 _thread_enter_cancellation_point(); 297 ret = __sys_readv(fd, iov, iovcnt); 298 _thread_leave_cancellation_point(); 299 300 return ret; 301 } 302 303 __weak_reference(_select, select); 304 305 int 306 _select(int numfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, 307 struct timeval *timeout) 308 { 309 int ret; 310 311 _thread_enter_cancellation_point(); 312 ret = __sys_select(numfds, readfds, writefds, exceptfds, timeout); 313 _thread_leave_cancellation_point(); 314 315 return ret; 316 } 317 318 __weak_reference(_sigaction, sigaction); 319 320 int 321 _sigaction(int sig, const struct sigaction *act, struct sigaction *oact) 322 { 323 struct sigaction *tmpact; 324 struct sigaction oldact, wrapperact; 325 int error; 326 327 /* Detect invalid signals. Signal SIGTHR is silently ignored */ 328 if (sig < 1 || sig > NSIG) { 329 errno = EINVAL; 330 return (-1); 331 } 332 if (sig == SIGTHR) 333 return (0); 334 335 /* 336 * If act is not NULL the library's signal wrapper is passed into the 337 * kernel only if the action is not SIG_DFL or SIG_IGN. 338 * On the other hand if act is NULL the caller only wants 339 * the old value so there is no need to call into the kernel. 340 */ 341 error = 0; 342 tmpact = NULL; 343 proc_sigact_copyout(sig, &oldact); 344 if (act != NULL) { 345 proc_sigact_copyin(sig, act); 346 tmpact = proc_sigact_sigaction(sig); 347 if (tmpact->sa_handler != SIG_DFL && 348 tmpact->sa_handler != SIG_IGN) { 349 bcopy((const void *)tmpact, (void *)&wrapperact, 350 sizeof(struct sigaction)); 351 tmpact->sa_flags &= SA_SIGINFO; 352 wrapperact.sa_sigaction = &_thread_sig_wrapper; 353 tmpact = &wrapperact; 354 } 355 error = __sys_sigaction(sig, tmpact, NULL); 356 } 357 if (error == 0) { 358 359 /* If successful, return the old sigaction to the user */ 360 if (oact != NULL ) 361 bcopy((const void *)&oldact, (void *)oact, 362 sizeof(struct sigaction)); 363 } else { 364 365 /* 366 * The only time error is non-zero is if the syscall failed, 367 * which means the sigaction in the process global list 368 * was altered before the syscall. Return it to it's old value. 369 */ 370 proc_sigact_copyin(sig, &oldact); 371 } 372 return (error); 373 } 374 375 __weak_reference(_sleep, sleep); 376 377 unsigned int 378 _sleep(unsigned int seconds) 379 { 380 unsigned int ret; 381 382 _thread_enter_cancellation_point(); 383 ret = __sleep(seconds); 384 _thread_leave_cancellation_point(); 385 386 return ret; 387 } 388 389 __weak_reference(_system, system); 390 391 int 392 _system(const char *string) 393 { 394 int ret; 395 396 _thread_enter_cancellation_point(); 397 ret = __system(string); 398 _thread_leave_cancellation_point(); 399 400 return ret; 401 } 402 403 404 __weak_reference(_tcdrain, tcdrain); 405 406 int 407 _tcdrain(int fd) 408 { 409 int ret; 410 411 _thread_enter_cancellation_point(); 412 ret = __tcdrain(fd); 413 _thread_leave_cancellation_point(); 414 415 return ret; 416 } 417 418 __weak_reference(_wait, wait); 419 420 pid_t 421 _wait(int *istat) 422 { 423 pid_t ret; 424 425 _thread_enter_cancellation_point(); 426 ret = __wait(istat); 427 _thread_leave_cancellation_point(); 428 429 return ret; 430 } 431 432 __weak_reference(_wait4, wait4); 433 434 pid_t 435 _wait4(pid_t pid, int *istat, int options, struct rusage *rusage) 436 { 437 pid_t ret; 438 439 _thread_enter_cancellation_point(); 440 ret = __sys_wait4(pid, istat, options, rusage); 441 _thread_leave_cancellation_point(); 442 443 return ret; 444 } 445 446 __weak_reference(_waitpid, waitpid); 447 448 pid_t 449 _waitpid(pid_t wpid, int *status, int options) 450 { 451 pid_t ret; 452 453 _thread_enter_cancellation_point(); 454 ret = __waitpid(wpid, status, options); 455 _thread_leave_cancellation_point(); 456 457 return ret; 458 } 459 460 __weak_reference(_write, write); 461 462 ssize_t 463 _write(int fd, const void *buf, size_t nbytes) 464 { 465 ssize_t ret; 466 467 _thread_enter_cancellation_point(); 468 ret = __sys_write(fd, buf, nbytes); 469 _thread_leave_cancellation_point(); 470 471 return ret; 472 } 473 474 __weak_reference(_writev, writev); 475 476 ssize_t 477 _writev(int fd, const struct iovec *iov, int iovcnt) 478 { 479 ssize_t ret; 480 481 _thread_enter_cancellation_point(); 482 ret = __sys_writev(fd, iov, iovcnt); 483 _thread_leave_cancellation_point(); 484 485 return ret; 486 } 487