1 /* 2 * Copyright (c) 2014 The FreeBSD Foundation. 3 * Copyright (C) 2005 David Xu <davidxu@freebsd.org>. 4 * Copyright (c) 2003 Daniel Eischen <deischen@freebsd.org>. 5 * Copyright (C) 2000 Jason Evans <jasone@freebsd.org>. 6 * All rights reserved. 7 * 8 * Portions of this software were developed by Konstantin Belousov 9 * under sponsorship from the FreeBSD Foundation. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice(s), this list of conditions and the following disclaimer as 16 * the first lines of this file unmodified other than the possible 17 * addition of one or more copyright notices. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice(s), this list of conditions and the following disclaimer in 20 * the documentation and/or other materials provided with the 21 * distribution. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY 24 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE 27 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 32 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 33 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /* 37 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au> 38 * All rights reserved. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 3. Neither the name of the author nor the names of any co-contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 * 64 */ 65 66 #include <sys/cdefs.h> 67 __FBSDID("$FreeBSD$"); 68 69 #include "namespace.h" 70 #include <sys/types.h> 71 #include <sys/mman.h> 72 #include <sys/param.h> 73 #include <sys/select.h> 74 #include <sys/signalvar.h> 75 #include <sys/socket.h> 76 #include <sys/stat.h> 77 #include <sys/time.h> 78 #include <sys/uio.h> 79 #include <sys/wait.h> 80 #include <aio.h> 81 #include <dirent.h> 82 #include <errno.h> 83 #include <fcntl.h> 84 #include <poll.h> 85 #include <signal.h> 86 #include <stdarg.h> 87 #include <stdio.h> 88 #include <stdlib.h> 89 #include <string.h> 90 #include <termios.h> 91 #include <unistd.h> 92 #include <pthread.h> 93 #include "un-namespace.h" 94 95 #include "libc_private.h" 96 #include "thr_private.h" 97 98 static int 99 __thr_accept(int s, struct sockaddr *addr, socklen_t *addrlen) 100 { 101 struct pthread *curthread; 102 int ret; 103 104 curthread = _get_curthread(); 105 _thr_cancel_enter(curthread); 106 ret = __sys_accept(s, addr, addrlen); 107 _thr_cancel_leave(curthread, ret == -1); 108 109 return (ret); 110 } 111 112 /* 113 * Cancellation behavior: 114 * If thread is canceled, no socket is created. 115 */ 116 static int 117 __thr_accept4(int s, struct sockaddr *addr, socklen_t *addrlen, int flags) 118 { 119 struct pthread *curthread; 120 int ret; 121 122 curthread = _get_curthread(); 123 _thr_cancel_enter(curthread); 124 ret = __sys_accept4(s, addr, addrlen, flags); 125 _thr_cancel_leave(curthread, ret == -1); 126 127 return (ret); 128 } 129 130 static int 131 __thr_aio_suspend(const struct aiocb * const iocbs[], int niocb, const struct 132 timespec *timeout) 133 { 134 struct pthread *curthread; 135 int ret; 136 137 curthread = _get_curthread(); 138 _thr_cancel_enter(curthread); 139 ret = __sys_aio_suspend(iocbs, niocb, timeout); 140 _thr_cancel_leave(curthread, 1); 141 142 return (ret); 143 } 144 145 /* 146 * Cancellation behavior: 147 * According to manual of close(), the file descriptor is always deleted. 148 * Here, thread is only canceled after the system call, so the file 149 * descriptor is always deleted despite whether the thread is canceled 150 * or not. 151 */ 152 static int 153 __thr_close(int fd) 154 { 155 struct pthread *curthread; 156 int ret; 157 158 curthread = _get_curthread(); 159 _thr_cancel_enter2(curthread, 0); 160 ret = __sys_close(fd); 161 _thr_cancel_leave(curthread, 1); 162 163 return (ret); 164 } 165 166 /* 167 * Cancellation behavior: 168 * If the thread is canceled, connection is not made. 169 */ 170 static int 171 __thr_connect(int fd, const struct sockaddr *name, socklen_t namelen) 172 { 173 struct pthread *curthread; 174 int ret; 175 176 curthread = _get_curthread(); 177 _thr_cancel_enter(curthread); 178 ret = __sys_connect(fd, name, namelen); 179 _thr_cancel_leave(curthread, ret == -1); 180 181 return (ret); 182 } 183 184 /* 185 * Cancellation behavior: 186 * According to specification, only F_SETLKW is a cancellation point. 187 * Thread is only canceled at start, or canceled if the system call 188 * is failure, this means the function does not generate side effect 189 * if it is canceled. 190 */ 191 static int 192 __thr_fcntl(int fd, int cmd, ...) 193 { 194 struct pthread *curthread; 195 int ret; 196 va_list ap; 197 198 curthread = _get_curthread(); 199 va_start(ap, cmd); 200 if (cmd == F_OSETLKW || cmd == F_SETLKW) { 201 _thr_cancel_enter(curthread); 202 ret = __sys_fcntl(fd, cmd, va_arg(ap, void *)); 203 _thr_cancel_leave(curthread, ret == -1); 204 } else { 205 ret = __sys_fcntl(fd, cmd, va_arg(ap, void *)); 206 } 207 va_end(ap); 208 209 return (ret); 210 } 211 212 /* 213 * Cancellation behavior: 214 * Thread may be canceled after system call. 215 */ 216 static int 217 __thr_fsync(int fd) 218 { 219 struct pthread *curthread; 220 int ret; 221 222 curthread = _get_curthread(); 223 _thr_cancel_enter2(curthread, 0); 224 ret = __sys_fsync(fd); 225 _thr_cancel_leave(curthread, 1); 226 227 return (ret); 228 } 229 230 static int 231 __thr_fdatasync(int fd) 232 { 233 struct pthread *curthread; 234 int ret; 235 236 curthread = _get_curthread(); 237 _thr_cancel_enter2(curthread, 0); 238 ret = __sys_fdatasync(fd); 239 _thr_cancel_leave(curthread, 1); 240 241 return (ret); 242 } 243 244 /* 245 * Cancellation behavior: 246 * Thread may be canceled after system call. 247 */ 248 static int 249 __thr_msync(void *addr, size_t len, int flags) 250 { 251 struct pthread *curthread; 252 int ret; 253 254 curthread = _get_curthread(); 255 _thr_cancel_enter2(curthread, 0); 256 ret = __sys_msync(addr, len, flags); 257 _thr_cancel_leave(curthread, 1); 258 259 return (ret); 260 } 261 262 static int 263 __thr_nanosleep(const struct timespec *time_to_sleep, 264 struct timespec *time_remaining) 265 { 266 struct pthread *curthread; 267 int ret; 268 269 curthread = _get_curthread(); 270 _thr_cancel_enter(curthread); 271 ret = __sys_nanosleep(time_to_sleep, time_remaining); 272 _thr_cancel_leave(curthread, 1); 273 274 return (ret); 275 } 276 277 /* 278 * Cancellation behavior: 279 * If the thread is canceled, file is not opened. 280 */ 281 static int 282 __thr_openat(int fd, const char *path, int flags, ...) 283 { 284 struct pthread *curthread; 285 int mode, ret; 286 va_list ap; 287 288 289 /* Check if the file is being created: */ 290 if ((flags & O_CREAT) != 0) { 291 /* Get the creation mode: */ 292 va_start(ap, flags); 293 mode = va_arg(ap, int); 294 va_end(ap); 295 } else { 296 mode = 0; 297 } 298 299 curthread = _get_curthread(); 300 _thr_cancel_enter(curthread); 301 ret = __sys_openat(fd, path, flags, mode); 302 _thr_cancel_leave(curthread, ret == -1); 303 304 return (ret); 305 } 306 307 /* 308 * Cancellation behavior: 309 * Thread may be canceled at start, but if the system call returns something, 310 * the thread is not canceled. 311 */ 312 static int 313 __thr_poll(struct pollfd *fds, unsigned int nfds, int timeout) 314 { 315 struct pthread *curthread; 316 int ret; 317 318 curthread = _get_curthread(); 319 _thr_cancel_enter(curthread); 320 ret = __sys_poll(fds, nfds, timeout); 321 _thr_cancel_leave(curthread, ret == -1); 322 323 return (ret); 324 } 325 326 /* 327 * Cancellation behavior: 328 * Thread may be canceled at start, but if the system call returns something, 329 * the thread is not canceled. 330 */ 331 static int 332 __thr_ppoll(struct pollfd pfd[], nfds_t nfds, const struct timespec * 333 timeout, const sigset_t *newsigmask) 334 { 335 struct pthread *curthread; 336 int ret; 337 338 curthread = _get_curthread(); 339 _thr_cancel_enter(curthread); 340 ret = __sys_ppoll(pfd, nfds, timeout, newsigmask); 341 _thr_cancel_leave(curthread, ret == -1); 342 343 return (ret); 344 } 345 346 /* 347 * Cancellation behavior: 348 * Thread may be canceled at start, but if the system call returns something, 349 * the thread is not canceled. 350 */ 351 static int 352 __thr_pselect(int count, fd_set *rfds, fd_set *wfds, fd_set *efds, 353 const struct timespec *timo, const sigset_t *mask) 354 { 355 struct pthread *curthread; 356 int ret; 357 358 curthread = _get_curthread(); 359 _thr_cancel_enter(curthread); 360 ret = __sys_pselect(count, rfds, wfds, efds, timo, mask); 361 _thr_cancel_leave(curthread, ret == -1); 362 363 return (ret); 364 } 365 366 static int 367 __thr_kevent(int kq, const struct kevent *changelist, int nchanges, 368 struct kevent *eventlist, int nevents, const struct timespec *timeout) 369 { 370 struct pthread *curthread; 371 int ret; 372 373 if (nevents == 0) { 374 /* 375 * No blocking, do not make the call cancellable. 376 */ 377 return (__sys_kevent(kq, changelist, nchanges, eventlist, 378 nevents, timeout)); 379 } 380 curthread = _get_curthread(); 381 _thr_cancel_enter(curthread); 382 ret = __sys_kevent(kq, changelist, nchanges, eventlist, nevents, 383 timeout); 384 _thr_cancel_leave(curthread, ret == -1 && nchanges == 0); 385 386 return (ret); 387 } 388 389 /* 390 * Cancellation behavior: 391 * Thread may be canceled at start, but if the system call got some data, 392 * the thread is not canceled. 393 */ 394 static ssize_t 395 __thr_read(int fd, void *buf, size_t nbytes) 396 { 397 struct pthread *curthread; 398 ssize_t ret; 399 400 curthread = _get_curthread(); 401 _thr_cancel_enter(curthread); 402 ret = __sys_read(fd, buf, nbytes); 403 _thr_cancel_leave(curthread, ret == -1); 404 405 return (ret); 406 } 407 408 /* 409 * Cancellation behavior: 410 * Thread may be canceled at start, but if the system call got some data, 411 * the thread is not canceled. 412 */ 413 static ssize_t 414 __thr_readv(int fd, const struct iovec *iov, int iovcnt) 415 { 416 struct pthread *curthread; 417 ssize_t ret; 418 419 curthread = _get_curthread(); 420 _thr_cancel_enter(curthread); 421 ret = __sys_readv(fd, iov, iovcnt); 422 _thr_cancel_leave(curthread, ret == -1); 423 return (ret); 424 } 425 426 /* 427 * Cancellation behavior: 428 * Thread may be canceled at start, but if the system call got some data, 429 * the thread is not canceled. 430 */ 431 static ssize_t 432 __thr_recvfrom(int s, void *b, size_t l, int f, struct sockaddr *from, 433 socklen_t *fl) 434 { 435 struct pthread *curthread; 436 ssize_t ret; 437 438 curthread = _get_curthread(); 439 _thr_cancel_enter(curthread); 440 ret = __sys_recvfrom(s, b, l, f, from, fl); 441 _thr_cancel_leave(curthread, ret == -1); 442 return (ret); 443 } 444 445 /* 446 * Cancellation behavior: 447 * Thread may be canceled at start, but if the system call got some data, 448 * the thread is not canceled. 449 */ 450 static ssize_t 451 __thr_recvmsg(int s, struct msghdr *m, int f) 452 { 453 struct pthread *curthread; 454 ssize_t ret; 455 456 curthread = _get_curthread(); 457 _thr_cancel_enter(curthread); 458 ret = __sys_recvmsg(s, m, f); 459 _thr_cancel_leave(curthread, ret == -1); 460 return (ret); 461 } 462 463 /* 464 * Cancellation behavior: 465 * Thread may be canceled at start, but if the system call returns something, 466 * the thread is not canceled. 467 */ 468 static int 469 __thr_select(int numfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, 470 struct timeval *timeout) 471 { 472 struct pthread *curthread; 473 int ret; 474 475 curthread = _get_curthread(); 476 _thr_cancel_enter(curthread); 477 ret = __sys_select(numfds, readfds, writefds, exceptfds, timeout); 478 _thr_cancel_leave(curthread, ret == -1); 479 return (ret); 480 } 481 482 /* 483 * Cancellation behavior: 484 * Thread may be canceled at start, but if the system call sent 485 * data, the thread is not canceled. 486 */ 487 static ssize_t 488 __thr_sendmsg(int s, const struct msghdr *m, int f) 489 { 490 struct pthread *curthread; 491 ssize_t ret; 492 493 curthread = _get_curthread(); 494 _thr_cancel_enter(curthread); 495 ret = __sys_sendmsg(s, m, f); 496 _thr_cancel_leave(curthread, ret <= 0); 497 return (ret); 498 } 499 500 /* 501 * Cancellation behavior: 502 * Thread may be canceled at start, but if the system call sent some 503 * data, the thread is not canceled. 504 */ 505 static ssize_t 506 __thr_sendto(int s, const void *m, size_t l, int f, const struct sockaddr *t, 507 socklen_t tl) 508 { 509 struct pthread *curthread; 510 ssize_t ret; 511 512 curthread = _get_curthread(); 513 _thr_cancel_enter(curthread); 514 ret = __sys_sendto(s, m, l, f, t, tl); 515 _thr_cancel_leave(curthread, ret <= 0); 516 return (ret); 517 } 518 519 static int 520 __thr_system(const char *string) 521 { 522 struct pthread *curthread; 523 int ret; 524 525 curthread = _get_curthread(); 526 _thr_cancel_enter(curthread); 527 ret = __libc_system(string); 528 _thr_cancel_leave(curthread, 1); 529 return (ret); 530 } 531 532 /* 533 * Cancellation behavior: 534 * If thread is canceled, the system call is not completed, 535 * this means not all bytes were drained. 536 */ 537 static int 538 __thr_tcdrain(int fd) 539 { 540 struct pthread *curthread; 541 int ret; 542 543 curthread = _get_curthread(); 544 _thr_cancel_enter(curthread); 545 ret = __libc_tcdrain(fd); 546 _thr_cancel_leave(curthread, ret == -1); 547 return (ret); 548 } 549 550 /* 551 * Cancellation behavior: 552 * Thread may be canceled at start, but if the system call returns 553 * a child pid, the thread is not canceled. 554 */ 555 static pid_t 556 __thr_wait4(pid_t pid, int *status, int options, struct rusage *rusage) 557 { 558 struct pthread *curthread; 559 pid_t ret; 560 561 curthread = _get_curthread(); 562 _thr_cancel_enter(curthread); 563 ret = __sys_wait4(pid, status, options, rusage); 564 _thr_cancel_leave(curthread, ret <= 0); 565 return (ret); 566 } 567 568 /* 569 * Cancellation behavior: 570 * Thread may be canceled at start, but if the system call returns 571 * a child pid, the thread is not canceled. 572 */ 573 static pid_t 574 __thr_wait6(idtype_t idtype, id_t id, int *status, int options, 575 struct __wrusage *ru, siginfo_t *infop) 576 { 577 struct pthread *curthread; 578 pid_t ret; 579 580 curthread = _get_curthread(); 581 _thr_cancel_enter(curthread); 582 ret = __sys_wait6(idtype, id, status, options, ru, infop); 583 _thr_cancel_leave(curthread, ret <= 0); 584 return (ret); 585 } 586 587 /* 588 * Cancellation behavior: 589 * Thread may be canceled at start, but if the thread wrote some data, 590 * it is not canceled. 591 */ 592 static ssize_t 593 __thr_write(int fd, const void *buf, size_t nbytes) 594 { 595 struct pthread *curthread; 596 ssize_t ret; 597 598 curthread = _get_curthread(); 599 _thr_cancel_enter(curthread); 600 ret = __sys_write(fd, buf, nbytes); 601 _thr_cancel_leave(curthread, (ret <= 0)); 602 return (ret); 603 } 604 605 /* 606 * Cancellation behavior: 607 * Thread may be canceled at start, but if the thread wrote some data, 608 * it is not canceled. 609 */ 610 static ssize_t 611 __thr_writev(int fd, const struct iovec *iov, int iovcnt) 612 { 613 struct pthread *curthread; 614 ssize_t ret; 615 616 curthread = _get_curthread(); 617 _thr_cancel_enter(curthread); 618 ret = __sys_writev(fd, iov, iovcnt); 619 _thr_cancel_leave(curthread, (ret <= 0)); 620 return (ret); 621 } 622 623 void 624 __thr_interpose_libc(void) 625 { 626 627 __set_error_selector(__error_threaded); 628 #define SLOT(name) \ 629 *(__libc_interposing_slot(INTERPOS_##name)) = \ 630 (interpos_func_t)__thr_##name; 631 SLOT(accept); 632 SLOT(accept4); 633 SLOT(aio_suspend); 634 SLOT(close); 635 SLOT(connect); 636 SLOT(fcntl); 637 SLOT(fsync); 638 SLOT(fork); 639 SLOT(msync); 640 SLOT(nanosleep); 641 SLOT(openat); 642 SLOT(poll); 643 SLOT(pselect); 644 SLOT(read); 645 SLOT(readv); 646 SLOT(recvfrom); 647 SLOT(recvmsg); 648 SLOT(select); 649 SLOT(sendmsg); 650 SLOT(sendto); 651 SLOT(setcontext); 652 SLOT(sigaction); 653 SLOT(sigprocmask); 654 SLOT(sigsuspend); 655 SLOT(sigwait); 656 SLOT(sigtimedwait); 657 SLOT(sigwaitinfo); 658 SLOT(swapcontext); 659 SLOT(system); 660 SLOT(tcdrain); 661 SLOT(wait4); 662 SLOT(write); 663 SLOT(writev); 664 SLOT(spinlock); 665 SLOT(spinunlock); 666 SLOT(kevent); 667 SLOT(wait6); 668 SLOT(ppoll); 669 SLOT(map_stacks_exec); 670 SLOT(fdatasync); 671 #undef SLOT 672 *(__libc_interposing_slot( 673 INTERPOS__pthread_mutex_init_calloc_cb)) = 674 (interpos_func_t)_pthread_mutex_init_calloc_cb; 675 } 676