1 /*
2  * Copyright (C) 2005 David Xu <davidxu@freebsd.org>.
3  * Copyright (c) 2003 Daniel Eischen <deischen@freebsd.org>.
4  * Copyright (C) 2000 Jason Evans <jasone@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 
32 /*
33  * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
34  * All rights reserved.
35  *
36  * Redistribution and use in source and binary forms, with or without
37  * modification, are permitted provided that the following conditions
38  * are met:
39  * 1. Redistributions of source code must retain the above copyright
40  *    notice, this list of conditions and the following disclaimer.
41  * 2. Redistributions in binary form must reproduce the above copyright
42  *    notice, this list of conditions and the following disclaimer in the
43  *    documentation and/or other materials provided with the distribution.
44  * 3. Neither the name of the author nor the names of any co-contributors
45  *    may be used to endorse or promote products derived from this software
46  *    without specific prior written permission.
47  *
48  * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58  * SUCH DAMAGE.
59  *
60  */
61 
62 
63 #include "namespace.h"
64 #include <sys/types.h>
65 #include <sys/mman.h>
66 #include <sys/param.h>
67 #include <sys/select.h>
68 #include <sys/signalvar.h>
69 #include <sys/socket.h>
70 #include <sys/stat.h>
71 #include <sys/time.h>
72 #include <sys/uio.h>
73 #include <sys/wait.h>
74 #include <machine/tls.h>
75 #include <aio.h>
76 #include <dirent.h>
77 #include <errno.h>
78 #include <fcntl.h>
79 #include <poll.h>
80 #include <signal.h>
81 #include <stdarg.h>
82 #include <stdio.h>
83 #include <stdlib.h>
84 #include <string.h>
85 #include <termios.h>
86 #include <unistd.h>
87 #include <pthread.h>
88 #include "un-namespace.h"
89 
90 #include "thr_private.h"
91 
92 extern int	__creat(const char *, mode_t);
93 extern int	__pause(void);
94 extern int	__sys_pselect(int, fd_set *, fd_set *, fd_set *,
95 			const struct timespec *, const sigset_t *);
96 extern unsigned	__sleep(unsigned int);
97 extern int	__system(const char *);
98 extern int	__tcdrain(int);
99 extern int	__usleep(unsigned);
100 extern pid_t	__wait(int *);
101 extern pid_t	__waitpid(pid_t, int *, int);
102 extern int	__sys_aio_suspend(const struct aiocb * const[], int,
103 			const struct timespec *);
104 extern int	__sys_accept(int, struct sockaddr *, socklen_t *);
105 extern int	__sys_connect(int, const struct sockaddr *, socklen_t);
106 extern int	__sys_fsync(int);
107 extern int	__sys_msync(void *, size_t, int);
108 extern int	__sys_poll(struct pollfd *, unsigned, int);
109 extern int	__sys_ppoll(struct pollfd *, unsigned, const struct timespec *,
110 			const sigset_t *);
111 extern ssize_t	__sys_recv(int, void *, size_t, int);
112 extern ssize_t	__sys_recvfrom(int, void *, size_t, int, struct sockaddr *, socklen_t *);
113 extern ssize_t	__sys_recvmsg(int, struct msghdr *, int);
114 extern int	__sys_select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
115 extern int	__sys_sendfile(int, int, off_t, size_t, struct sf_hdtr *,
116 			off_t *, int);
117 extern ssize_t	__sys_sendmsg(int, const struct msghdr *, int);
118 extern ssize_t	__sys_sendto(int, const void *,size_t, int, const struct sockaddr *, socklen_t);
119 extern ssize_t	__sys_readv(int, const struct iovec *, int);
120 extern pid_t	__sys_wait4(pid_t, int *, int, struct rusage *);
121 extern ssize_t	__sys_writev(int, const struct iovec *, int);
122 
123 int	___creat(const char *, mode_t);
124 int	___usleep(unsigned);
125 int	__accept(int, struct sockaddr *, socklen_t *);
126 int	__close(int);
127 int	__connect(int, const struct sockaddr *, socklen_t);
128 int	__fcntl(int, int,...);
129 int	__fsync(int);
130 int	__msync(void *, size_t, int);
131 int	__nanosleep(const struct timespec *, struct timespec *);
132 int	__open(const char *, int,...);
133 int	__openat(int fd, const char *, int,...);
134 int	__poll(struct pollfd *, unsigned int, int);
135 int	__ppoll(struct pollfd *, unsigned int, const struct timespec *,
136 		const sigset_t *);
137 ssize_t	__read(int, void *buf, size_t);
138 ssize_t	__readv(int, const struct iovec *, int);
139 ssize_t	__recvfrom(int, void *, size_t, int f, struct sockaddr *, socklen_t *);
140 ssize_t	__recvmsg(int, struct msghdr *, int);
141 int	__select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
142 ssize_t	__sendmsg(int, const struct msghdr *, int);
143 ssize_t	__sendto(int, const void *, size_t, int,
144 		const struct sockaddr *, socklen_t);
145 pid_t	__wait4(pid_t, int *, int, struct rusage *);
146 ssize_t	__write(int, const void *, size_t);
147 ssize_t	__writev(int, const struct iovec *, int);
148 int	_aio_suspend(const struct aiocb * const iocbs[], int,
149 		const struct timespec *);
150 int	_pause(void);
151 int	__pselect(int, fd_set *, fd_set *, fd_set *,
152 		const struct timespec *, const sigset_t *);
153 int	_raise(int);
154 unsigned	_sleep(unsigned);
155 int	_system(const char *);
156 int	_tcdrain(int);
157 #if 0
158 int	_vfork(void);
159 #endif
160 pid_t	_wait(int *);
161 
162 int
163 __accept(int s, struct sockaddr *addr, socklen_t *addrlen)
164 {
165 	struct pthread *curthread;
166 	int oldcancel;
167 	int ret;
168 
169 	curthread = tls_get_curthread();
170 	oldcancel = _thr_cancel_enter(curthread);
171 	ret = __sys_accept(s, addr, addrlen);
172 	_thr_cancel_leave(curthread, oldcancel);
173 
174 	return (ret);
175 }
176 
177 __strong_reference(__accept, accept);
178 
179 int
180 _aio_suspend(const struct aiocb * const iocbs[], int niocb, const struct
181     timespec *timeout)
182 {
183 	struct pthread *curthread = tls_get_curthread();
184 	int oldcancel;
185 	int ret;
186 
187 	oldcancel = _thr_cancel_enter(curthread);
188 	ret = __sys_aio_suspend(iocbs, niocb, timeout);
189 	_thr_cancel_leave(curthread, oldcancel);
190 
191 	return (ret);
192 }
193 
194 __strong_reference(_aio_suspend, aio_suspend);
195 
196 int
197 __close(int fd)
198 {
199 	struct pthread	*curthread = tls_get_curthread();
200 	int	oldcancel;
201 	int	ret;
202 
203 	oldcancel = _thr_cancel_enter(curthread);
204 	ret = __sys_close(fd);
205 	_thr_cancel_leave(curthread, oldcancel);
206 
207 	return (ret);
208 }
209 
210 __strong_reference(__close, close);
211 
212 int
213 __connect(int fd, const struct sockaddr *name, socklen_t namelen)
214 {
215 	struct pthread *curthread = tls_get_curthread();
216 	int oldcancel;
217 	int ret;
218 
219 	oldcancel = _thr_cancel_enter(curthread);
220 	ret = __sys_connect(fd, name, namelen);
221 	_thr_cancel_leave(curthread, oldcancel);
222 
223 	return (ret);
224 }
225 
226 __strong_reference(__connect, connect);
227 
228 int
229 ___creat(const char *path, mode_t mode)
230 {
231 	struct pthread *curthread = tls_get_curthread();
232 	int oldcancel;
233 	int ret;
234 
235 	oldcancel = _thr_cancel_enter(curthread);
236 	ret = __creat(path, mode);
237 	_thr_cancel_leave(curthread, oldcancel);
238 
239 	return ret;
240 }
241 
242 __strong_reference(___creat, creat);
243 
244 int
245 __fcntl(int fd, int cmd,...)
246 {
247 	struct pthread *curthread = tls_get_curthread();
248 	int	oldcancel;
249 	int	ret;
250 	va_list	ap;
251 
252 	oldcancel = _thr_cancel_enter(curthread);
253 
254 	va_start(ap, cmd);
255 	switch (cmd) {
256 	case F_DUPFD:
257 		ret = __sys_fcntl(fd, cmd, va_arg(ap, int));
258 		break;
259 	case F_SETFD:
260 	case F_SETFL:
261 		ret = __sys_fcntl(fd, cmd, va_arg(ap, int));
262 		break;
263 	case F_GETFD:
264 	case F_GETFL:
265 		ret = __sys_fcntl(fd, cmd);
266 		break;
267 	default:
268 		ret = __sys_fcntl(fd, cmd, va_arg(ap, void *));
269 	}
270 	va_end(ap);
271 
272 	_thr_cancel_leave(curthread, oldcancel);
273 
274 	return (ret);
275 }
276 
277 __strong_reference(__fcntl, fcntl);
278 
279 int
280 __fsync(int fd)
281 {
282 	struct pthread *curthread = tls_get_curthread();
283 	int	oldcancel;
284 	int	ret;
285 
286 	oldcancel = _thr_cancel_enter(curthread);
287 	ret = __sys_fsync(fd);
288 	_thr_cancel_leave(curthread, oldcancel);
289 
290 	return (ret);
291 }
292 
293 __strong_reference(__fsync, fsync);
294 
295 int
296 __msync(void *addr, size_t len, int flags)
297 {
298 	struct pthread *curthread = tls_get_curthread();
299 	int	oldcancel;
300 	int	ret;
301 
302 	oldcancel = _thr_cancel_enter(curthread);
303 	ret = __sys_msync(addr, len, flags);
304 	_thr_cancel_leave(curthread, oldcancel);
305 
306 	return ret;
307 }
308 
309 __strong_reference(__msync, msync);
310 
311 int
312 __nanosleep(const struct timespec *time_to_sleep,
313     struct timespec *time_remaining)
314 {
315 	struct pthread *curthread = tls_get_curthread();
316 	int		oldcancel;
317 	int		ret;
318 
319 	oldcancel = _thr_cancel_enter(curthread);
320 	ret = __sys_nanosleep(time_to_sleep, time_remaining);
321 	_thr_cancel_leave(curthread, oldcancel);
322 
323 	return (ret);
324 }
325 
326 __strong_reference(__nanosleep, nanosleep);
327 
328 int
329 __open(const char *path, int flags,...)
330 {
331 	struct pthread *curthread = tls_get_curthread();
332 	int	oldcancel;
333 	int	ret;
334 	int	mode = 0;
335 	va_list	ap;
336 
337 	oldcancel = _thr_cancel_enter(curthread);
338 
339 	/* Check if the file is being created: */
340 	if (flags & O_CREAT) {
341 		/* Get the creation mode: */
342 		va_start(ap, flags);
343 		mode = va_arg(ap, int);
344 		va_end(ap);
345 	}
346 
347 	ret = __sys_open(path, flags, mode);
348 
349 	_thr_cancel_leave(curthread, oldcancel);
350 
351 	return ret;
352 }
353 
354 __strong_reference(__open, open);
355 
356 int
357 __openat(int fd, const char *path, int flags,...)
358 {
359 	struct pthread *curthread = tls_get_curthread();
360 	int	oldcancel;
361 	int	ret;
362 	int	mode = 0;
363 	va_list	ap;
364 
365 	oldcancel = _thr_cancel_enter(curthread);
366 
367 	/* Check if the file is being created: */
368 	if (flags & O_CREAT) {
369 		/* Get the creation mode: */
370 		va_start(ap, flags);
371 		mode = va_arg(ap, int);
372 		va_end(ap);
373 	}
374 
375 	ret = __sys_openat(fd, path, flags, mode);
376 
377 	_thr_cancel_leave(curthread, oldcancel);
378 
379 	return ret;
380 }
381 
382 __strong_reference(__openat, openat);
383 
384 int
385 _pause(void)
386 {
387 	struct pthread *curthread = tls_get_curthread();
388 	int	oldcancel;
389 	int	ret;
390 
391 	oldcancel = _thr_cancel_enter(curthread);
392 	ret = __pause();
393 	_thr_cancel_leave(curthread, oldcancel);
394 
395 	return ret;
396 }
397 
398 __strong_reference(_pause, pause);
399 
400 int
401 __poll(struct pollfd *fds, unsigned int nfds, int timeout)
402 {
403 	struct pthread *curthread = tls_get_curthread();
404 	int oldcancel;
405 	int ret;
406 
407 	oldcancel = _thr_cancel_enter(curthread);
408 	ret = __sys_poll(fds, nfds, timeout);
409 	_thr_cancel_leave(curthread, oldcancel);
410 
411 	return ret;
412 }
413 
414 __strong_reference(__poll, poll);
415 
416 int
417 __ppoll(struct pollfd *fds, unsigned int nfds, const struct timespec *ts,
418 	const sigset_t *mask)
419 {
420 	struct pthread *curthread = tls_get_curthread();
421 	int oldcancel;
422 	int ret;
423 
424 	oldcancel = _thr_cancel_enter(curthread);
425 	ret = __sys_ppoll(fds, nfds, ts, mask);
426 	_thr_cancel_leave(curthread, oldcancel);
427 
428 	return ret;
429 }
430 
431 __strong_reference(__ppoll, ppoll);
432 
433 int
434 __pselect(int count, fd_set *rfds, fd_set *wfds, fd_set *efds,
435 	const struct timespec *timo, const sigset_t *mask)
436 {
437 	struct pthread *curthread = tls_get_curthread();
438 	int oldcancel;
439 	int ret;
440 
441 	oldcancel = _thr_cancel_enter(curthread);
442 	ret = __sys_pselect(count, rfds, wfds, efds, timo, mask);
443 	_thr_cancel_leave(curthread, oldcancel);
444 
445 	return (ret);
446 }
447 __strong_reference(__pselect, pselect);
448 
449 
450 int
451 _raise(int sig)
452 {
453 	int ret;
454 
455 	if (!_thr_isthreaded())
456 		ret = kill(getpid(), sig);
457 	else
458 		ret = _thr_send_sig(tls_get_curthread(), sig);
459 	return (ret);
460 }
461 
462 __strong_reference(_raise, raise);
463 
464 ssize_t
465 __read(int fd, void *buf, size_t nbytes)
466 {
467 	struct pthread *curthread = tls_get_curthread();
468 	int oldcancel;
469 	ssize_t	ret;
470 
471 	oldcancel = _thr_cancel_enter(curthread);
472 	ret = __sys_read(fd, buf, nbytes);
473 	_thr_cancel_leave(curthread, oldcancel);
474 	return ret;
475 }
476 
477 __strong_reference(__read, read);
478 
479 ssize_t
480 __readv(int fd, const struct iovec *iov, int iovcnt)
481 {
482 	struct pthread *curthread = tls_get_curthread();
483 	int oldcancel;
484 	ssize_t ret;
485 
486 	oldcancel = _thr_cancel_enter(curthread);
487 	ret = __sys_readv(fd, iov, iovcnt);
488 	_thr_cancel_leave(curthread, oldcancel);
489 	return ret;
490 }
491 
492 __strong_reference(__readv, readv);
493 
494 ssize_t
495 __recvfrom(int s, void *b, size_t l, int f, struct sockaddr *from,
496     socklen_t *fl)
497 {
498 	struct pthread *curthread = tls_get_curthread();
499 	int oldcancel;
500 	ssize_t ret;
501 
502 	oldcancel = _thr_cancel_enter(curthread);
503 	ret = __sys_recvfrom(s, b, l, f, from, fl);
504 	_thr_cancel_leave(curthread, oldcancel);
505 	return (ret);
506 }
507 
508 __strong_reference(__recvfrom, recvfrom);
509 
510 ssize_t
511 __recvmsg(int s, struct msghdr *m, int f)
512 {
513 	struct pthread *curthread = tls_get_curthread();
514 	ssize_t ret;
515 	int oldcancel;
516 
517 	oldcancel = _thr_cancel_enter(curthread);
518 	ret = __sys_recvmsg(s, m, f);
519 	_thr_cancel_leave(curthread, oldcancel);
520 	return (ret);
521 }
522 
523 __strong_reference(__recvmsg, recvmsg);
524 
525 int
526 __select(int numfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
527 	struct timeval *timeout)
528 {
529 	struct pthread *curthread = tls_get_curthread();
530 	int oldcancel;
531 	int ret;
532 
533 	oldcancel = _thr_cancel_enter(curthread);
534 	ret = __sys_select(numfds, readfds, writefds, exceptfds, timeout);
535 	_thr_cancel_leave(curthread, oldcancel);
536 	return ret;
537 }
538 
539 __strong_reference(__select, select);
540 
541 ssize_t
542 __sendmsg(int s, const struct msghdr *m, int f)
543 {
544 	struct pthread *curthread = tls_get_curthread();
545 	ssize_t ret;
546 	int oldcancel;
547 
548 	oldcancel = _thr_cancel_enter(curthread);
549 	ret = __sys_sendmsg(s, m, f);
550 	_thr_cancel_leave(curthread, oldcancel);
551 	return (ret);
552 }
553 
554 __strong_reference(__sendmsg, sendmsg);
555 
556 ssize_t
557 __sendto(int s, const void *m, size_t l, int f, const struct sockaddr *t,
558     socklen_t tl)
559 {
560 	struct pthread *curthread = tls_get_curthread();
561 	ssize_t ret;
562 	int oldcancel;
563 
564 	oldcancel = _thr_cancel_enter(curthread);
565 	ret = __sys_sendto(s, m, l, f, t, tl);
566 	_thr_cancel_leave(curthread, oldcancel);
567 	return (ret);
568 }
569 
570 __strong_reference(__sendto, sendto);
571 
572 unsigned int
573 _sleep(unsigned int seconds)
574 {
575 	struct pthread *curthread = tls_get_curthread();
576 	int		oldcancel;
577 	unsigned int	ret;
578 
579 	oldcancel = _thr_cancel_enter(curthread);
580 	ret = __sleep(seconds);
581 	_thr_cancel_leave(curthread, oldcancel);
582 	return (ret);
583 }
584 
585 int
586 _system(const char *string)
587 {
588 	struct pthread *curthread = tls_get_curthread();
589 	int	oldcancel;
590 	int	ret;
591 
592 	oldcancel = _thr_cancel_enter(curthread);
593 	ret = __system(string);
594 	_thr_cancel_leave(curthread, oldcancel);
595 	return ret;
596 }
597 
598 __strong_reference(_system, system);
599 
600 int
601 _tcdrain(int fd)
602 {
603 	struct pthread *curthread = tls_get_curthread();
604 	int	oldcancel;
605 	int	ret;
606 
607 	oldcancel = _thr_cancel_enter(curthread);
608 	ret = __tcdrain(fd);
609 	_thr_cancel_leave(curthread, oldcancel);
610 	return (ret);
611 }
612 
613 __strong_reference(_tcdrain, tcdrain);
614 
615 int
616 ___usleep(unsigned int useconds)
617 {
618 	struct pthread *curthread = tls_get_curthread();
619 	int		oldcancel;
620 	int		ret;
621 
622 	oldcancel = _thr_cancel_enter(curthread);
623 	ret = __usleep(useconds);
624 	_thr_cancel_leave(curthread, oldcancel);
625 	return (ret);
626 }
627 
628 __strong_reference(___usleep, usleep);
629 
630 #if 0
631 /*
632  * REMOVED - vfork() works as per normal.  In a threaded environment vfork()
633  *	     blocks the calling thread only and not other threads.
634  */
635 int
636 _vfork(void)
637 {
638 	return (fork());
639 }
640 
641 __strong_reference(_vfork, vfork);
642 #endif
643 
644 pid_t
645 _wait(int *istat)
646 {
647 	struct pthread *curthread = tls_get_curthread();
648 	int	oldcancel;
649 	pid_t	ret;
650 
651 	oldcancel = _thr_cancel_enter(curthread);
652 	ret = __wait(istat);
653 	_thr_cancel_leave(curthread, oldcancel);
654 	return ret;
655 }
656 
657 __strong_reference(_wait, wait);
658 
659 pid_t
660 __wait4(pid_t pid, int *istat, int options, struct rusage *rusage)
661 {
662 	struct pthread *curthread = tls_get_curthread();
663 	int oldcancel;
664 	pid_t ret;
665 
666 	oldcancel = _thr_cancel_enter(curthread);
667 	ret = __sys_wait4(pid, istat, options, rusage);
668 	_thr_cancel_leave(curthread, oldcancel);
669 	return ret;
670 }
671 
672 __strong_reference(__wait4, wait4);
673 
674 pid_t
675 _waitpid(pid_t wpid, int *status, int options)
676 {
677 	struct pthread *curthread = tls_get_curthread();
678 	int	oldcancel;
679 	pid_t	ret;
680 
681 	oldcancel = _thr_cancel_enter(curthread);
682 	ret = __waitpid(wpid, status, options);
683 	_thr_cancel_leave(curthread, oldcancel);
684 	return ret;
685 }
686 
687 __strong_reference(_waitpid, waitpid);
688 
689 ssize_t
690 __write(int fd, const void *buf, size_t nbytes)
691 {
692 	struct pthread *curthread = tls_get_curthread();
693 	int	oldcancel;
694 	ssize_t	ret;
695 
696 	oldcancel = _thr_cancel_enter(curthread);
697 	ret = __sys_write(fd, buf, nbytes);
698 	_thr_cancel_leave(curthread, oldcancel);
699 	return ret;
700 }
701 
702 __strong_reference(__write, write);
703 
704 ssize_t
705 __writev(int fd, const struct iovec *iov, int iovcnt)
706 {
707 	struct pthread *curthread = tls_get_curthread();
708 	int	oldcancel;
709 	ssize_t ret;
710 
711 	oldcancel = _thr_cancel_enter(curthread);
712 	ret = __sys_writev(fd, iov, iovcnt);
713 	_thr_cancel_leave(curthread, oldcancel);
714 	return ret;
715 }
716 
717 __strong_reference(__writev, writev);
718