thr_syscalls.c revision 296732
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: stable/10/lib/libthr/thread/thr_syscalls.c 296732 2016-03-12 17:33:40Z kib $"); 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#ifdef SYSCALL_COMPAT 99extern int __fcntl_compat(int, int, ...); 100#endif 101 102static int 103__thr_accept(int s, struct sockaddr *addr, socklen_t *addrlen) 104{ 105 struct pthread *curthread; 106 int ret; 107 108 curthread = _get_curthread(); 109 _thr_cancel_enter(curthread); 110 ret = __sys_accept(s, addr, addrlen); 111 _thr_cancel_leave(curthread, ret == -1); 112 113 return (ret); 114} 115 116/* 117 * Cancellation behavior: 118 * If thread is canceled, no socket is created. 119 */ 120static int 121__thr_accept4(int s, struct sockaddr *addr, socklen_t *addrlen, int flags) 122{ 123 struct pthread *curthread; 124 int ret; 125 126 curthread = _get_curthread(); 127 _thr_cancel_enter(curthread); 128 ret = __sys_accept4(s, addr, addrlen, flags); 129 _thr_cancel_leave(curthread, ret == -1); 130 131 return (ret); 132} 133 134static int 135__thr_aio_suspend(const struct aiocb * const iocbs[], int niocb, const struct 136 timespec *timeout) 137{ 138 struct pthread *curthread; 139 int ret; 140 141 curthread = _get_curthread(); 142 _thr_cancel_enter(curthread); 143 ret = __sys_aio_suspend(iocbs, niocb, timeout); 144 _thr_cancel_leave(curthread, 1); 145 146 return (ret); 147} 148 149/* 150 * Cancellation behavior: 151 * According to manual of close(), the file descriptor is always deleted. 152 * Here, thread is only canceled after the system call, so the file 153 * descriptor is always deleted despite whether the thread is canceled 154 * or not. 155 */ 156static int 157__thr_close(int fd) 158{ 159 struct pthread *curthread; 160 int ret; 161 162 curthread = _get_curthread(); 163 _thr_cancel_enter2(curthread, 0); 164 ret = __sys_close(fd); 165 _thr_cancel_leave(curthread, 1); 166 167 return (ret); 168} 169 170/* 171 * Cancellation behavior: 172 * If the thread is canceled, connection is not made. 173 */ 174static int 175__thr_connect(int fd, const struct sockaddr *name, socklen_t namelen) 176{ 177 struct pthread *curthread; 178 int ret; 179 180 curthread = _get_curthread(); 181 _thr_cancel_enter(curthread); 182 ret = __sys_connect(fd, name, namelen); 183 _thr_cancel_leave(curthread, ret == -1); 184 185 return (ret); 186} 187 188/* 189 * Cancellation behavior: 190 * According to specification, only F_SETLKW is a cancellation point. 191 * Thread is only canceled at start, or canceled if the system call 192 * is failure, this means the function does not generate side effect 193 * if it is canceled. 194 */ 195static int 196__thr_fcntl(int fd, int cmd, ...) 197{ 198 struct pthread *curthread; 199 int ret; 200 va_list ap; 201 202 curthread = _get_curthread(); 203 va_start(ap, cmd); 204 if (cmd == F_OSETLKW || cmd == F_SETLKW) { 205 _thr_cancel_enter(curthread); 206#ifdef SYSCALL_COMPAT 207 ret = __fcntl_compat(fd, cmd, va_arg(ap, void *)); 208#else 209 ret = __sys_fcntl(fd, cmd, va_arg(ap, void *)); 210#endif 211 _thr_cancel_leave(curthread, ret == -1); 212 } else { 213#ifdef SYSCALL_COMPAT 214 ret = __fcntl_compat(fd, cmd, va_arg(ap, void *)); 215#else 216 ret = __sys_fcntl(fd, cmd, va_arg(ap, void *)); 217#endif 218 } 219 va_end(ap); 220 221 return (ret); 222} 223 224/* 225 * Cancellation behavior: 226 * Thread may be canceled after system call. 227 */ 228static int 229__thr_fsync(int fd) 230{ 231 struct pthread *curthread; 232 int ret; 233 234 curthread = _get_curthread(); 235 _thr_cancel_enter2(curthread, 0); 236 ret = __sys_fsync(fd); 237 _thr_cancel_leave(curthread, 1); 238 239 return (ret); 240} 241 242/* 243 * Cancellation behavior: 244 * Thread may be canceled after system call. 245 */ 246static int 247__thr_msync(void *addr, size_t len, int flags) 248{ 249 struct pthread *curthread; 250 int ret; 251 252 curthread = _get_curthread(); 253 _thr_cancel_enter2(curthread, 0); 254 ret = __sys_msync(addr, len, flags); 255 _thr_cancel_leave(curthread, 1); 256 257 return (ret); 258} 259 260static int 261__thr_nanosleep(const struct timespec *time_to_sleep, 262 struct timespec *time_remaining) 263{ 264 struct pthread *curthread; 265 int ret; 266 267 curthread = _get_curthread(); 268 _thr_cancel_enter(curthread); 269 ret = __sys_nanosleep(time_to_sleep, time_remaining); 270 _thr_cancel_leave(curthread, 1); 271 272 return (ret); 273} 274 275/* 276 * Cancellation behavior: 277 * If the thread is canceled, file is not opened. 278 */ 279static int 280__thr_openat(int fd, const char *path, int flags, ...) 281{ 282 struct pthread *curthread; 283 int mode, ret; 284 va_list ap; 285 286 287 /* Check if the file is being created: */ 288 if ((flags & O_CREAT) != 0) { 289 /* Get the creation mode: */ 290 va_start(ap, flags); 291 mode = va_arg(ap, int); 292 va_end(ap); 293 } else { 294 mode = 0; 295 } 296 297 curthread = _get_curthread(); 298 _thr_cancel_enter(curthread); 299 ret = __sys_openat(fd, path, flags, mode); 300 _thr_cancel_leave(curthread, ret == -1); 301 302 return (ret); 303} 304 305/* 306 * Cancellation behavior: 307 * Thread may be canceled at start, but if the system call returns something, 308 * the thread is not canceled. 309 */ 310static int 311__thr_poll(struct pollfd *fds, unsigned int nfds, int timeout) 312{ 313 struct pthread *curthread; 314 int ret; 315 316 curthread = _get_curthread(); 317 _thr_cancel_enter(curthread); 318 ret = __sys_poll(fds, nfds, timeout); 319 _thr_cancel_leave(curthread, ret == -1); 320 321 return (ret); 322} 323 324/* 325 * Cancellation behavior: 326 * Thread may be canceled at start, but if the system call returns something, 327 * the thread is not canceled. 328 */ 329static int 330__thr_ppoll(struct pollfd pfd[], nfds_t nfds, const struct timespec * 331 timeout, const sigset_t *newsigmask) 332{ 333 struct pthread *curthread; 334 int ret; 335 336 curthread = _get_curthread(); 337 _thr_cancel_enter(curthread); 338 ret = __sys_ppoll(pfd, nfds, timeout, newsigmask); 339 _thr_cancel_leave(curthread, ret == -1); 340 341 return (ret); 342} 343 344/* 345 * Cancellation behavior: 346 * Thread may be canceled at start, but if the system call returns something, 347 * the thread is not canceled. 348 */ 349static int 350__thr_pselect(int count, fd_set *rfds, fd_set *wfds, fd_set *efds, 351 const struct timespec *timo, const sigset_t *mask) 352{ 353 struct pthread *curthread; 354 int ret; 355 356 curthread = _get_curthread(); 357 _thr_cancel_enter(curthread); 358 ret = __sys_pselect(count, rfds, wfds, efds, timo, mask); 359 _thr_cancel_leave(curthread, ret == -1); 360 361 return (ret); 362} 363 364static int 365__thr_kevent(int kq, const struct kevent *changelist, int nchanges, 366 struct kevent *eventlist, int nevents, const struct timespec *timeout) 367{ 368 struct pthread *curthread; 369 int ret; 370 371 if (nevents == 0) { 372 /* 373 * No blocking, do not make the call cancellable. 374 */ 375 return (__sys_kevent(kq, changelist, nchanges, eventlist, 376 nevents, timeout)); 377 } 378 curthread = _get_curthread(); 379 _thr_cancel_enter(curthread); 380 ret = __sys_kevent(kq, changelist, nchanges, eventlist, nevents, 381 timeout); 382 _thr_cancel_leave(curthread, ret == -1 && nchanges == 0); 383 384 return (ret); 385} 386 387/* 388 * Cancellation behavior: 389 * Thread may be canceled at start, but if the system call got some data, 390 * the thread is not canceled. 391 */ 392static ssize_t 393__thr_read(int fd, void *buf, size_t nbytes) 394{ 395 struct pthread *curthread; 396 ssize_t ret; 397 398 curthread = _get_curthread(); 399 _thr_cancel_enter(curthread); 400 ret = __sys_read(fd, buf, nbytes); 401 _thr_cancel_leave(curthread, ret == -1); 402 403 return (ret); 404} 405 406/* 407 * Cancellation behavior: 408 * Thread may be canceled at start, but if the system call got some data, 409 * the thread is not canceled. 410 */ 411static ssize_t 412__thr_readv(int fd, const struct iovec *iov, int iovcnt) 413{ 414 struct pthread *curthread; 415 ssize_t ret; 416 417 curthread = _get_curthread(); 418 _thr_cancel_enter(curthread); 419 ret = __sys_readv(fd, iov, iovcnt); 420 _thr_cancel_leave(curthread, ret == -1); 421 return (ret); 422} 423 424/* 425 * Cancellation behavior: 426 * Thread may be canceled at start, but if the system call got some data, 427 * the thread is not canceled. 428 */ 429static ssize_t 430__thr_recvfrom(int s, void *b, size_t l, int f, struct sockaddr *from, 431 socklen_t *fl) 432{ 433 struct pthread *curthread; 434 ssize_t ret; 435 436 curthread = _get_curthread(); 437 _thr_cancel_enter(curthread); 438 ret = __sys_recvfrom(s, b, l, f, from, fl); 439 _thr_cancel_leave(curthread, ret == -1); 440 return (ret); 441} 442 443/* 444 * Cancellation behavior: 445 * Thread may be canceled at start, but if the system call got some data, 446 * the thread is not canceled. 447 */ 448static ssize_t 449__thr_recvmsg(int s, struct msghdr *m, int f) 450{ 451 struct pthread *curthread; 452 ssize_t ret; 453 454 curthread = _get_curthread(); 455 _thr_cancel_enter(curthread); 456 ret = __sys_recvmsg(s, m, f); 457 _thr_cancel_leave(curthread, ret == -1); 458 return (ret); 459} 460 461/* 462 * Cancellation behavior: 463 * Thread may be canceled at start, but if the system call returns something, 464 * the thread is not canceled. 465 */ 466static int 467__thr_select(int numfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, 468 struct timeval *timeout) 469{ 470 struct pthread *curthread; 471 int ret; 472 473 curthread = _get_curthread(); 474 _thr_cancel_enter(curthread); 475 ret = __sys_select(numfds, readfds, writefds, exceptfds, timeout); 476 _thr_cancel_leave(curthread, ret == -1); 477 return (ret); 478} 479 480/* 481 * Cancellation behavior: 482 * Thread may be canceled at start, but if the system call sent 483 * data, the thread is not canceled. 484 */ 485static ssize_t 486__thr_sendmsg(int s, const struct msghdr *m, int f) 487{ 488 struct pthread *curthread; 489 ssize_t ret; 490 491 curthread = _get_curthread(); 492 _thr_cancel_enter(curthread); 493 ret = __sys_sendmsg(s, m, f); 494 _thr_cancel_leave(curthread, ret <= 0); 495 return (ret); 496} 497 498/* 499 * Cancellation behavior: 500 * Thread may be canceled at start, but if the system call sent some 501 * data, the thread is not canceled. 502 */ 503static ssize_t 504__thr_sendto(int s, const void *m, size_t l, int f, const struct sockaddr *t, 505 socklen_t tl) 506{ 507 struct pthread *curthread; 508 ssize_t ret; 509 510 curthread = _get_curthread(); 511 _thr_cancel_enter(curthread); 512 ret = __sys_sendto(s, m, l, f, t, tl); 513 _thr_cancel_leave(curthread, ret <= 0); 514 return (ret); 515} 516 517static int 518__thr_system(const char *string) 519{ 520 struct pthread *curthread; 521 int ret; 522 523 curthread = _get_curthread(); 524 _thr_cancel_enter(curthread); 525 ret = __libc_system(string); 526 _thr_cancel_leave(curthread, 1); 527 return (ret); 528} 529 530/* 531 * Cancellation behavior: 532 * If thread is canceled, the system call is not completed, 533 * this means not all bytes were drained. 534 */ 535static int 536__thr_tcdrain(int fd) 537{ 538 struct pthread *curthread; 539 int ret; 540 541 curthread = _get_curthread(); 542 _thr_cancel_enter(curthread); 543 ret = __libc_tcdrain(fd); 544 _thr_cancel_leave(curthread, ret == -1); 545 return (ret); 546} 547 548/* 549 * Cancellation behavior: 550 * Thread may be canceled at start, but if the system call returns 551 * a child pid, the thread is not canceled. 552 */ 553static pid_t 554__thr_wait4(pid_t pid, int *status, int options, struct rusage *rusage) 555{ 556 struct pthread *curthread; 557 pid_t ret; 558 559 curthread = _get_curthread(); 560 _thr_cancel_enter(curthread); 561 ret = __sys_wait4(pid, status, options, rusage); 562 _thr_cancel_leave(curthread, ret <= 0); 563 return (ret); 564} 565 566/* 567 * Cancellation behavior: 568 * Thread may be canceled at start, but if the system call returns 569 * a child pid, the thread is not canceled. 570 */ 571static pid_t 572__thr_wait6(idtype_t idtype, id_t id, int *status, int options, 573 struct __wrusage *ru, siginfo_t *infop) 574{ 575 struct pthread *curthread; 576 pid_t ret; 577 578 curthread = _get_curthread(); 579 _thr_cancel_enter(curthread); 580 ret = __sys_wait6(idtype, id, status, options, ru, infop); 581 _thr_cancel_leave(curthread, ret <= 0); 582 return (ret); 583} 584 585/* 586 * Cancellation behavior: 587 * Thread may be canceled at start, but if the thread wrote some data, 588 * it is not canceled. 589 */ 590static ssize_t 591__thr_write(int fd, const void *buf, size_t nbytes) 592{ 593 struct pthread *curthread; 594 ssize_t ret; 595 596 curthread = _get_curthread(); 597 _thr_cancel_enter(curthread); 598 ret = __sys_write(fd, buf, nbytes); 599 _thr_cancel_leave(curthread, (ret <= 0)); 600 return (ret); 601} 602 603/* 604 * Cancellation behavior: 605 * Thread may be canceled at start, but if the thread wrote some data, 606 * it is not canceled. 607 */ 608static ssize_t 609__thr_writev(int fd, const struct iovec *iov, int iovcnt) 610{ 611 struct pthread *curthread; 612 ssize_t ret; 613 614 curthread = _get_curthread(); 615 _thr_cancel_enter(curthread); 616 ret = __sys_writev(fd, iov, iovcnt); 617 _thr_cancel_leave(curthread, (ret <= 0)); 618 return (ret); 619} 620 621void 622__thr_interpose_libc(void) 623{ 624 625 __set_error_selector(__error_threaded); 626#define SLOT(name) \ 627 *(__libc_interposing_slot(INTERPOS_##name)) = \ 628 (interpos_func_t)__thr_##name; 629 SLOT(accept); 630 SLOT(accept4); 631 SLOT(aio_suspend); 632 SLOT(close); 633 SLOT(connect); 634 SLOT(fcntl); 635 SLOT(fsync); 636 SLOT(fork); 637 SLOT(msync); 638 SLOT(nanosleep); 639 SLOT(openat); 640 SLOT(poll); 641 SLOT(pselect); 642 SLOT(read); 643 SLOT(readv); 644 SLOT(recvfrom); 645 SLOT(recvmsg); 646 SLOT(select); 647 SLOT(sendmsg); 648 SLOT(sendto); 649 SLOT(setcontext); 650 SLOT(sigaction); 651 SLOT(sigprocmask); 652 SLOT(sigsuspend); 653 SLOT(sigwait); 654 SLOT(sigtimedwait); 655 SLOT(sigwaitinfo); 656 SLOT(swapcontext); 657 SLOT(system); 658 SLOT(tcdrain); 659 SLOT(wait4); 660 SLOT(write); 661 SLOT(writev); 662 SLOT(spinlock); 663 SLOT(spinunlock); 664 SLOT(kevent); 665 SLOT(wait6); 666 SLOT(ppoll); 667 SLOT(map_stacks_exec); 668#undef SLOT 669 *(__libc_interposing_slot( 670 INTERPOS__pthread_mutex_init_calloc_cb)) = 671 (interpos_func_t)_pthread_mutex_init_calloc_cb; 672} 673