1 /* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
2 * Permission is hereby granted, free of charge, to any person obtaining a copy
3 * of this software and associated documentation files (the "Software"), to
4 * deal in the Software without restriction, including without limitation the
5 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
6 * sell copies of the Software, and to permit persons to whom the Software is
7 * furnished to do so, subject to the following conditions:
9 * The above copyright notice and this permission notice shall be included in
10 * all copies or substantial portions of the Software.
12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
13 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
14 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
15 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
16 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
17 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 #include <stddef.h> /* NULL */
25 #include <stdio.h> /* printf */
27 #include <string.h> /* strerror */
31 #include <sys/types.h>
34 #include <sys/socket.h>
36 #include <netinet/in.h>
37 #include <arpa/inet.h>
38 #include <limits.h> /* INT_MAX, PATH_MAX */
39 #include <sys/uio.h> /* writev */
42 # include <sys/ioctl.h>
46 # include <sys/types.h>
47 # include <sys/wait.h>
51 # include <mach-o/dyld.h> /* _NSGetExecutablePath */
52 # include <sys/filio.h>
53 # include <sys/ioctl.h>
57 # include <sys/sysctl.h>
58 # include <sys/filio.h>
59 # include <sys/ioctl.h>
60 # include <sys/wait.h>
63 static void uv__run_pending(uv_loop_t* loop);
65 static uv_loop_t default_loop_struct;
66 static uv_loop_t* default_loop_ptr;
68 /* Verify that uv_buf_t is ABI-compatible with struct iovec. */
69 STATIC_ASSERT(sizeof(uv_buf_t) == sizeof(struct iovec));
70 STATIC_ASSERT(sizeof(&((uv_buf_t*) 0)->base) ==
71 sizeof(((struct iovec*) 0)->iov_base));
72 STATIC_ASSERT(sizeof(&((uv_buf_t*) 0)->len) ==
73 sizeof(((struct iovec*) 0)->iov_len));
74 STATIC_ASSERT((uintptr_t) &((uv_buf_t*) 0)->base ==
75 (uintptr_t) &((struct iovec*) 0)->iov_base);
76 STATIC_ASSERT((uintptr_t) &((uv_buf_t*) 0)->len ==
77 (uintptr_t) &((struct iovec*) 0)->iov_len);
80 uint64_t uv_hrtime(void) {
85 void uv_close(uv_handle_t* handle, uv_close_cb close_cb) {
86 assert(!(handle->flags & (UV_CLOSING | UV_CLOSED)));
88 handle->flags |= UV_CLOSING;
89 handle->close_cb = close_cb;
91 switch (handle->type) {
93 uv__pipe_close((uv_pipe_t*)handle);
97 uv__stream_close((uv_stream_t*)handle);
101 uv__tcp_close((uv_tcp_t*)handle);
105 uv__udp_close((uv_udp_t*)handle);
109 uv__prepare_close((uv_prepare_t*)handle);
113 uv__check_close((uv_check_t*)handle);
117 uv__idle_close((uv_idle_t*)handle);
121 uv__async_close((uv_async_t*)handle);
125 uv__timer_close((uv_timer_t*)handle);
129 uv__process_close((uv_process_t*)handle);
133 uv__fs_event_close((uv_fs_event_t*)handle);
137 uv__poll_close((uv_poll_t*)handle);
141 uv__fs_poll_close((uv_fs_poll_t*)handle);
145 uv__signal_close((uv_signal_t*) handle);
146 /* Signal handles may not be closed immediately. The signal code will */
147 /* itself close uv__make_close_pending whenever appropriate. */
154 uv__make_close_pending(handle);
158 void uv__make_close_pending(uv_handle_t* handle) {
159 assert(handle->flags & UV_CLOSING);
160 assert(!(handle->flags & UV_CLOSED));
161 handle->next_closing = handle->loop->closing_handles;
162 handle->loop->closing_handles = handle;
166 static void uv__finish_close(uv_handle_t* handle) {
167 assert(!uv__is_active(handle));
168 assert(handle->flags & UV_CLOSING);
169 assert(!(handle->flags & UV_CLOSED));
170 handle->flags |= UV_CLOSED;
172 switch (handle->type) {
188 uv__stream_destroy((uv_stream_t*)handle);
192 uv__udp_finish_close((uv_udp_t*)handle);
200 uv__handle_unref(handle);
201 QUEUE_REMOVE(&handle->handle_queue);
203 if (handle->close_cb) {
204 handle->close_cb(handle);
209 static void uv__run_closing_handles(uv_loop_t* loop) {
213 p = loop->closing_handles;
214 loop->closing_handles = NULL;
224 int uv_is_closing(const uv_handle_t* handle) {
225 return handle->flags & (UV_CLOSING | UV_CLOSED);
229 uv_loop_t* uv_default_loop(void) {
230 if (default_loop_ptr)
231 return default_loop_ptr;
233 if (uv__loop_init(&default_loop_struct, /* default_loop? */ 1))
236 return (default_loop_ptr = &default_loop_struct);
240 uv_loop_t* uv_loop_new(void) {
243 if ((loop = malloc(sizeof(*loop))) == NULL)
246 if (uv__loop_init(loop, /* default_loop? */ 0)) {
255 void uv_loop_delete(uv_loop_t* loop) {
256 uv__loop_delete(loop);
258 memset(loop, -1, sizeof *loop);
260 if (loop == default_loop_ptr)
261 default_loop_ptr = NULL;
267 int uv_backend_fd(const uv_loop_t* loop) {
268 return loop->backend_fd;
272 int uv_backend_timeout(const uv_loop_t* loop) {
273 if (loop->stop_flag != 0)
276 if (!uv__has_active_handles(loop) && !uv__has_active_reqs(loop))
279 if (!QUEUE_EMPTY(&loop->idle_handles))
282 if (loop->closing_handles)
285 return uv__next_timeout(loop);
289 static int uv__loop_alive(uv_loop_t* loop) {
290 return uv__has_active_handles(loop) ||
291 uv__has_active_reqs(loop) ||
292 loop->closing_handles != NULL;
296 int uv_run(uv_loop_t* loop, uv_run_mode mode) {
300 r = uv__loop_alive(loop);
301 while (r != 0 && loop->stop_flag == 0) {
302 UV_TICK_START(loop, mode);
304 uv__update_time(loop);
305 uv__run_timers(loop);
307 uv__run_prepare(loop);
308 uv__run_pending(loop);
311 if ((mode & UV_RUN_NOWAIT) == 0)
312 timeout = uv_backend_timeout(loop);
314 uv__io_poll(loop, timeout);
316 uv__run_closing_handles(loop);
317 r = uv__loop_alive(loop);
319 UV_TICK_STOP(loop, mode);
321 if (mode & (UV_RUN_ONCE | UV_RUN_NOWAIT))
325 /* The if statement lets gcc compile it to a conditional store. Avoids
326 * dirtying a cache line.
328 if (loop->stop_flag != 0)
335 void uv_update_time(uv_loop_t* loop) {
336 uv__update_time(loop);
340 uint64_t uv_now(uv_loop_t* loop) {
345 int uv_is_active(const uv_handle_t* handle) {
346 return uv__is_active(handle);
350 /* Open a socket in non-blocking close-on-exec mode, atomically if possible. */
351 int uv__socket(int domain, int type, int protocol) {
354 #if defined(SOCK_NONBLOCK) && defined(SOCK_CLOEXEC)
355 sockfd = socket(domain, type | SOCK_NONBLOCK | SOCK_CLOEXEC, protocol);
364 sockfd = socket(domain, type, protocol);
369 if (uv__nonblock(sockfd, 1) || uv__cloexec(sockfd, 1)) {
374 #if defined(SO_NOSIGPIPE)
377 setsockopt(sockfd, SOL_SOCKET, SO_NOSIGPIPE, &on, sizeof(on));
386 int uv__accept(int sockfd) {
392 #if defined(__linux__)
393 static int no_accept4;
398 peerfd = uv__accept4(sockfd,
401 UV__SOCK_NONBLOCK|UV__SOCK_CLOEXEC);
416 peerfd = accept(sockfd, NULL, NULL);
425 if (uv__cloexec(peerfd, 1) || uv__nonblock(peerfd, 1)) {
437 #if defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__)
439 int uv__nonblock(int fd, int set) {
443 r = ioctl(fd, FIONBIO, &set);
444 while (r == -1 && errno == EINTR);
450 int uv__cloexec(int fd, int set) {
454 r = ioctl(fd, set ? FIOCLEX : FIONCLEX);
455 while (r == -1 && errno == EINTR);
460 #else /* !(defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__)) */
462 int uv__nonblock(int fd, int set) {
467 r = fcntl(fd, F_GETFL);
468 while (r == -1 && errno == EINTR);
473 /* Bail out now if already set/clear. */
474 if (!!(r & O_NONBLOCK) == !!set)
478 flags = r | O_NONBLOCK;
480 flags = r & ~O_NONBLOCK;
483 r = fcntl(fd, F_SETFL, flags);
484 while (r == -1 && errno == EINTR);
490 int uv__cloexec(int fd, int set) {
495 r = fcntl(fd, F_GETFD);
496 while (r == -1 && errno == EINTR);
501 /* Bail out now if already set/clear. */
502 if (!!(r & FD_CLOEXEC) == !!set)
506 flags = r | FD_CLOEXEC;
508 flags = r & ~FD_CLOEXEC;
511 r = fcntl(fd, F_SETFD, flags);
512 while (r == -1 && errno == EINTR);
517 #endif /* defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__) */
520 /* This function is not execve-safe, there is a race window
521 * between the call to dup() and fcntl(FD_CLOEXEC).
523 int uv__dup(int fd) {
529 if (uv__cloexec(fd, 1)) {
530 SAVE_ERRNO(close(fd));
538 uv_err_t uv_cwd(char* buffer, size_t size) {
539 if (!buffer || !size) {
540 return uv__new_artificial_error(UV_EINVAL);
543 if (getcwd(buffer, size)) {
546 return uv__new_sys_error(errno);
551 uv_err_t uv_chdir(const char* dir) {
552 if (chdir(dir) == 0) {
555 return uv__new_sys_error(errno);
560 void uv_disable_stdio_inheritance(void) {
563 /* Set the CLOEXEC flag on all open descriptors. Unconditionally try the
564 * first 16 file descriptors. After that, bail out after the first error.
567 if (uv__cloexec(fd, 1) && fd > 15)
572 static void uv__run_pending(uv_loop_t* loop) {
576 while (!QUEUE_EMPTY(&loop->pending_queue)) {
577 q = QUEUE_HEAD(&loop->pending_queue);
581 w = QUEUE_DATA(q, uv__io_t, pending_queue);
582 w->cb(loop, w, UV__POLLOUT);
587 static unsigned int next_power_of_two(unsigned int val) {
598 static void maybe_resize(uv_loop_t* loop, unsigned int len) {
600 unsigned int nwatchers;
603 if (len <= loop->nwatchers)
606 nwatchers = next_power_of_two(len);
607 watchers = realloc(loop->watchers, nwatchers * sizeof(loop->watchers[0]));
609 if (watchers == NULL)
612 for (i = loop->nwatchers; i < nwatchers; i++)
615 loop->watchers = watchers;
616 loop->nwatchers = nwatchers;
620 void uv__io_init(uv__io_t* w, uv__io_cb cb, int fd) {
623 QUEUE_INIT(&w->pending_queue);
624 QUEUE_INIT(&w->watcher_queue);
630 #if defined(UV_HAVE_KQUEUE)
633 #endif /* defined(UV_HAVE_KQUEUE) */
637 void uv__io_start(uv_loop_t* loop, uv__io_t* w, unsigned int events) {
638 assert(0 == (events & ~(UV__POLLIN | UV__POLLOUT)));
641 assert(w->fd < INT_MAX);
643 w->pevents |= events;
644 maybe_resize(loop, w->fd + 1);
647 /* The event ports backend needs to rearm all file descriptors on each and
648 * every tick of the event loop but the other backends allow us to
649 * short-circuit here if the event mask is unchanged.
651 if (w->events == w->pevents) {
652 if (w->events == 0 && !QUEUE_EMPTY(&w->watcher_queue)) {
653 QUEUE_REMOVE(&w->watcher_queue);
654 QUEUE_INIT(&w->watcher_queue);
660 if (QUEUE_EMPTY(&w->watcher_queue))
661 QUEUE_INSERT_TAIL(&loop->watcher_queue, &w->watcher_queue);
663 if (loop->watchers[w->fd] == NULL) {
664 loop->watchers[w->fd] = w;
670 void uv__io_stop(uv_loop_t* loop, uv__io_t* w, unsigned int events) {
671 assert(0 == (events & ~(UV__POLLIN | UV__POLLOUT)));
679 /* Happens when uv__io_stop() is called on a handle that was never started. */
680 if ((unsigned) w->fd >= loop->nwatchers)
683 w->pevents &= ~events;
685 if (w->pevents == 0) {
686 QUEUE_REMOVE(&w->watcher_queue);
687 QUEUE_INIT(&w->watcher_queue);
689 if (loop->watchers[w->fd] != NULL) {
690 assert(loop->watchers[w->fd] == w);
691 assert(loop->nfds > 0);
692 loop->watchers[w->fd] = NULL;
697 else if (QUEUE_EMPTY(&w->watcher_queue))
698 QUEUE_INSERT_TAIL(&loop->watcher_queue, &w->watcher_queue);
702 void uv__io_close(uv_loop_t* loop, uv__io_t* w) {
703 uv__io_stop(loop, w, UV__POLLIN | UV__POLLOUT);
704 QUEUE_REMOVE(&w->pending_queue);
708 void uv__io_feed(uv_loop_t* loop, uv__io_t* w) {
709 if (QUEUE_EMPTY(&w->pending_queue))
710 QUEUE_INSERT_TAIL(&loop->pending_queue, &w->pending_queue);
714 int uv__io_active(const uv__io_t* w, unsigned int events) {
715 assert(0 == (events & ~(UV__POLLIN | UV__POLLOUT)));
717 return 0 != (w->pevents & events);