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(offsetof(uv_buf_t, base) == offsetof(struct iovec, iov_base));
75 STATIC_ASSERT(offsetof(uv_buf_t, len) == offsetof(struct iovec, iov_len));
78 uint64_t uv_hrtime(void) {
83 void uv_close(uv_handle_t* handle, uv_close_cb close_cb) {
84 assert(!(handle->flags & (UV_CLOSING | UV_CLOSED)));
86 handle->flags |= UV_CLOSING;
87 handle->close_cb = close_cb;
89 switch (handle->type) {
91 uv__pipe_close((uv_pipe_t*)handle);
95 uv__stream_close((uv_stream_t*)handle);
99 uv__tcp_close((uv_tcp_t*)handle);
103 uv__udp_close((uv_udp_t*)handle);
107 uv__prepare_close((uv_prepare_t*)handle);
111 uv__check_close((uv_check_t*)handle);
115 uv__idle_close((uv_idle_t*)handle);
119 uv__async_close((uv_async_t*)handle);
123 uv__timer_close((uv_timer_t*)handle);
127 uv__process_close((uv_process_t*)handle);
131 uv__fs_event_close((uv_fs_event_t*)handle);
135 uv__poll_close((uv_poll_t*)handle);
139 uv__fs_poll_close((uv_fs_poll_t*)handle);
143 uv__signal_close((uv_signal_t*) handle);
144 /* Signal handles may not be closed immediately. The signal code will */
145 /* itself close uv__make_close_pending whenever appropriate. */
152 uv__make_close_pending(handle);
156 void uv__make_close_pending(uv_handle_t* handle) {
157 assert(handle->flags & UV_CLOSING);
158 assert(!(handle->flags & UV_CLOSED));
159 handle->next_closing = handle->loop->closing_handles;
160 handle->loop->closing_handles = handle;
164 static void uv__finish_close(uv_handle_t* handle) {
165 /* Note: while the handle is in the UV_CLOSING state now, it's still possible
166 * for it to be active in the sense that uv__is_active() returns true.
167 * A good example is when the user calls uv_shutdown(), immediately followed
168 * by uv_close(). The handle is considered active at this point because the
169 * completion of the shutdown req is still pending.
171 assert(handle->flags & UV_CLOSING);
172 assert(!(handle->flags & UV_CLOSED));
173 handle->flags |= UV_CLOSED;
175 switch (handle->type) {
191 uv__stream_destroy((uv_stream_t*)handle);
195 uv__udp_finish_close((uv_udp_t*)handle);
203 uv__handle_unref(handle);
204 QUEUE_REMOVE(&handle->handle_queue);
206 if (handle->close_cb) {
207 handle->close_cb(handle);
212 static void uv__run_closing_handles(uv_loop_t* loop) {
216 p = loop->closing_handles;
217 loop->closing_handles = NULL;
227 int uv_is_closing(const uv_handle_t* handle) {
228 return uv__is_closing(handle);
232 uv_loop_t* uv_default_loop(void) {
233 if (default_loop_ptr)
234 return default_loop_ptr;
236 if (uv__loop_init(&default_loop_struct, /* default_loop? */ 1))
239 return (default_loop_ptr = &default_loop_struct);
243 uv_loop_t* uv_loop_new(void) {
246 if ((loop = malloc(sizeof(*loop))) == NULL)
249 if (uv__loop_init(loop, /* default_loop? */ 0)) {
258 void uv_loop_delete(uv_loop_t* loop) {
259 uv__loop_delete(loop);
261 memset(loop, -1, sizeof *loop);
263 if (loop == default_loop_ptr)
264 default_loop_ptr = NULL;
270 int uv_backend_fd(const uv_loop_t* loop) {
271 return loop->backend_fd;
275 int uv_backend_timeout(const uv_loop_t* loop) {
276 if (loop->stop_flag != 0)
279 if (!uv__has_active_handles(loop) && !uv__has_active_reqs(loop))
282 if (!QUEUE_EMPTY(&loop->idle_handles))
285 if (loop->closing_handles)
288 return uv__next_timeout(loop);
292 static int uv__loop_alive(uv_loop_t* loop) {
293 return uv__has_active_handles(loop) ||
294 uv__has_active_reqs(loop) ||
295 loop->closing_handles != NULL;
299 int uv_run(uv_loop_t* loop, uv_run_mode mode) {
303 r = uv__loop_alive(loop);
304 while (r != 0 && loop->stop_flag == 0) {
305 UV_TICK_START(loop, mode);
307 uv__update_time(loop);
308 uv__run_timers(loop);
310 uv__run_prepare(loop);
311 uv__run_pending(loop);
314 if ((mode & UV_RUN_NOWAIT) == 0)
315 timeout = uv_backend_timeout(loop);
317 uv__io_poll(loop, timeout);
319 uv__run_closing_handles(loop);
321 if (mode == UV_RUN_ONCE) {
322 /* UV_RUN_ONCE implies forward progess: at least one callback must have
323 * been invoked when it returns. uv__io_poll() can return without doing
324 * I/O (meaning: no callbacks) when its timeout expires - which means we
325 * have pending timers that satisfy the forward progress constraint.
327 * UV_RUN_NOWAIT makes no guarantees about progress so it's omitted from
330 uv__update_time(loop);
331 uv__run_timers(loop);
334 r = uv__loop_alive(loop);
335 UV_TICK_STOP(loop, mode);
337 if (mode & (UV_RUN_ONCE | UV_RUN_NOWAIT))
341 /* The if statement lets gcc compile it to a conditional store. Avoids
342 * dirtying a cache line.
344 if (loop->stop_flag != 0)
351 void uv_update_time(uv_loop_t* loop) {
352 uv__update_time(loop);
356 int uv_is_active(const uv_handle_t* handle) {
357 return uv__is_active(handle);
361 /* Open a socket in non-blocking close-on-exec mode, atomically if possible. */
362 int uv__socket(int domain, int type, int protocol) {
365 #if defined(SOCK_NONBLOCK) && defined(SOCK_CLOEXEC)
366 sockfd = socket(domain, type | SOCK_NONBLOCK | SOCK_CLOEXEC, protocol);
375 sockfd = socket(domain, type, protocol);
380 if (uv__nonblock(sockfd, 1) || uv__cloexec(sockfd, 1)) {
385 #if defined(SO_NOSIGPIPE)
388 setsockopt(sockfd, SOL_SOCKET, SO_NOSIGPIPE, &on, sizeof(on));
397 int uv__accept(int sockfd) {
403 #if defined(__linux__)
404 static int no_accept4;
409 peerfd = uv__accept4(sockfd,
412 UV__SOCK_NONBLOCK|UV__SOCK_CLOEXEC);
427 peerfd = accept(sockfd, NULL, NULL);
436 if (uv__cloexec(peerfd, 1) || uv__nonblock(peerfd, 1)) {
448 #if defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__)
450 int uv__nonblock(int fd, int set) {
454 r = ioctl(fd, FIONBIO, &set);
455 while (r == -1 && errno == EINTR);
461 int uv__cloexec(int fd, int set) {
465 r = ioctl(fd, set ? FIOCLEX : FIONCLEX);
466 while (r == -1 && errno == EINTR);
471 #else /* !(defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__)) */
473 int uv__nonblock(int fd, int set) {
478 r = fcntl(fd, F_GETFL);
479 while (r == -1 && errno == EINTR);
484 /* Bail out now if already set/clear. */
485 if (!!(r & O_NONBLOCK) == !!set)
489 flags = r | O_NONBLOCK;
491 flags = r & ~O_NONBLOCK;
494 r = fcntl(fd, F_SETFL, flags);
495 while (r == -1 && errno == EINTR);
501 int uv__cloexec(int fd, int set) {
506 r = fcntl(fd, F_GETFD);
507 while (r == -1 && errno == EINTR);
512 /* Bail out now if already set/clear. */
513 if (!!(r & FD_CLOEXEC) == !!set)
517 flags = r | FD_CLOEXEC;
519 flags = r & ~FD_CLOEXEC;
522 r = fcntl(fd, F_SETFD, flags);
523 while (r == -1 && errno == EINTR);
528 #endif /* defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__) */
531 /* This function is not execve-safe, there is a race window
532 * between the call to dup() and fcntl(FD_CLOEXEC).
534 int uv__dup(int fd) {
540 if (uv__cloexec(fd, 1)) {
541 SAVE_ERRNO(close(fd));
549 uv_err_t uv_cwd(char* buffer, size_t size) {
550 if (!buffer || !size) {
551 return uv__new_artificial_error(UV_EINVAL);
554 if (getcwd(buffer, size)) {
557 return uv__new_sys_error(errno);
562 uv_err_t uv_chdir(const char* dir) {
563 if (chdir(dir) == 0) {
566 return uv__new_sys_error(errno);
571 void uv_disable_stdio_inheritance(void) {
574 /* Set the CLOEXEC flag on all open descriptors. Unconditionally try the
575 * first 16 file descriptors. After that, bail out after the first error.
578 if (uv__cloexec(fd, 1) && fd > 15)
583 static void uv__run_pending(uv_loop_t* loop) {
587 while (!QUEUE_EMPTY(&loop->pending_queue)) {
588 q = QUEUE_HEAD(&loop->pending_queue);
592 w = QUEUE_DATA(q, uv__io_t, pending_queue);
593 w->cb(loop, w, UV__POLLOUT);
598 static unsigned int next_power_of_two(unsigned int val) {
609 static void maybe_resize(uv_loop_t* loop, unsigned int len) {
611 unsigned int nwatchers;
614 if (len <= loop->nwatchers)
617 nwatchers = next_power_of_two(len);
618 watchers = realloc(loop->watchers, nwatchers * sizeof(loop->watchers[0]));
620 if (watchers == NULL)
623 for (i = loop->nwatchers; i < nwatchers; i++)
626 loop->watchers = watchers;
627 loop->nwatchers = nwatchers;
631 void uv__io_init(uv__io_t* w, uv__io_cb cb, int fd) {
634 QUEUE_INIT(&w->pending_queue);
635 QUEUE_INIT(&w->watcher_queue);
641 #if defined(UV_HAVE_KQUEUE)
644 #endif /* defined(UV_HAVE_KQUEUE) */
648 void uv__io_start(uv_loop_t* loop, uv__io_t* w, unsigned int events) {
649 assert(0 == (events & ~(UV__POLLIN | UV__POLLOUT)));
652 assert(w->fd < INT_MAX);
654 w->pevents |= events;
655 maybe_resize(loop, w->fd + 1);
658 /* The event ports backend needs to rearm all file descriptors on each and
659 * every tick of the event loop but the other backends allow us to
660 * short-circuit here if the event mask is unchanged.
662 if (w->events == w->pevents) {
663 if (w->events == 0 && !QUEUE_EMPTY(&w->watcher_queue)) {
664 QUEUE_REMOVE(&w->watcher_queue);
665 QUEUE_INIT(&w->watcher_queue);
671 if (QUEUE_EMPTY(&w->watcher_queue))
672 QUEUE_INSERT_TAIL(&loop->watcher_queue, &w->watcher_queue);
674 if (loop->watchers[w->fd] == NULL) {
675 loop->watchers[w->fd] = w;
681 void uv__io_stop(uv_loop_t* loop, uv__io_t* w, unsigned int events) {
682 assert(0 == (events & ~(UV__POLLIN | UV__POLLOUT)));
690 /* Happens when uv__io_stop() is called on a handle that was never started. */
691 if ((unsigned) w->fd >= loop->nwatchers)
694 w->pevents &= ~events;
696 if (w->pevents == 0) {
697 QUEUE_REMOVE(&w->watcher_queue);
698 QUEUE_INIT(&w->watcher_queue);
700 if (loop->watchers[w->fd] != NULL) {
701 assert(loop->watchers[w->fd] == w);
702 assert(loop->nfds > 0);
703 loop->watchers[w->fd] = NULL;
708 else if (QUEUE_EMPTY(&w->watcher_queue))
709 QUEUE_INSERT_TAIL(&loop->watcher_queue, &w->watcher_queue);
713 void uv__io_close(uv_loop_t* loop, uv__io_t* w) {
714 uv__io_stop(loop, w, UV__POLLIN | UV__POLLOUT);
715 QUEUE_REMOVE(&w->pending_queue);
719 void uv__io_feed(uv_loop_t* loop, uv__io_t* w) {
720 if (QUEUE_EMPTY(&w->pending_queue))
721 QUEUE_INSERT_TAIL(&loop->pending_queue, &w->pending_queue);
725 int uv__io_active(const uv__io_t* w, unsigned int events) {
726 assert(0 == (events & ~(UV__POLLIN | UV__POLLOUT)));
728 return 0 != (w->pevents & events);