diff options
Diffstat (limited to '3rdparty/libuv/src/unix/signal.c')
-rw-r--r-- | 3rdparty/libuv/src/unix/signal.c | 467 |
1 files changed, 0 insertions, 467 deletions
diff --git a/3rdparty/libuv/src/unix/signal.c b/3rdparty/libuv/src/unix/signal.c deleted file mode 100644 index edd9085d3f3..00000000000 --- a/3rdparty/libuv/src/unix/signal.c +++ /dev/null @@ -1,467 +0,0 @@ -/* Copyright Joyent, Inc. and other Node contributors. All rights reserved. - * Permission is hereby granted, free of charge, to any person obtaining a copy - * of this software and associated documentation files (the "Software"), to - * deal in the Software without restriction, including without limitation the - * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or - * sell copies of the Software, and to permit persons to whom the Software is - * furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice shall be included in - * all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE - * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING - * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS - * IN THE SOFTWARE. - */ - -#include "uv.h" -#include "internal.h" - -#include <assert.h> -#include <errno.h> -#include <signal.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> - - -typedef struct { - uv_signal_t* handle; - int signum; -} uv__signal_msg_t; - -RB_HEAD(uv__signal_tree_s, uv_signal_s); - - -static int uv__signal_unlock(void); -static void uv__signal_event(uv_loop_t* loop, uv__io_t* w, unsigned int events); -static int uv__signal_compare(uv_signal_t* w1, uv_signal_t* w2); -static void uv__signal_stop(uv_signal_t* handle); - - -static pthread_once_t uv__signal_global_init_guard = PTHREAD_ONCE_INIT; -static struct uv__signal_tree_s uv__signal_tree = - RB_INITIALIZER(uv__signal_tree); -static int uv__signal_lock_pipefd[2]; - - -RB_GENERATE_STATIC(uv__signal_tree_s, - uv_signal_s, tree_entry, - uv__signal_compare) - - -static void uv__signal_global_init(void) { - if (uv__make_pipe(uv__signal_lock_pipefd, 0)) - abort(); - - if (uv__signal_unlock()) - abort(); -} - - -void uv__signal_global_once_init(void) { - pthread_once(&uv__signal_global_init_guard, uv__signal_global_init); -} - - - -static int uv__signal_lock(void) { - int r; - char data; - - do { - r = read(uv__signal_lock_pipefd[0], &data, sizeof data); - } while (r < 0 && errno == EINTR); - - return (r < 0) ? -1 : 0; -} - - -static int uv__signal_unlock(void) { - int r; - char data = 42; - - do { - r = write(uv__signal_lock_pipefd[1], &data, sizeof data); - } while (r < 0 && errno == EINTR); - - return (r < 0) ? -1 : 0; -} - - -static void uv__signal_block_and_lock(sigset_t* saved_sigmask) { - sigset_t new_mask; - - if (sigfillset(&new_mask)) - abort(); - - if (pthread_sigmask(SIG_SETMASK, &new_mask, saved_sigmask)) - abort(); - - if (uv__signal_lock()) - abort(); -} - - -static void uv__signal_unlock_and_unblock(sigset_t* saved_sigmask) { - if (uv__signal_unlock()) - abort(); - - if (pthread_sigmask(SIG_SETMASK, saved_sigmask, NULL)) - abort(); -} - - -static uv_signal_t* uv__signal_first_handle(int signum) { - /* This function must be called with the signal lock held. */ - uv_signal_t lookup; - uv_signal_t* handle; - - lookup.signum = signum; - lookup.loop = NULL; - - handle = RB_NFIND(uv__signal_tree_s, &uv__signal_tree, &lookup); - - if (handle != NULL && handle->signum == signum) - return handle; - - return NULL; -} - - -static void uv__signal_handler(int signum) { - uv__signal_msg_t msg; - uv_signal_t* handle; - int saved_errno; - - saved_errno = errno; - memset(&msg, 0, sizeof msg); - - if (uv__signal_lock()) { - errno = saved_errno; - return; - } - - for (handle = uv__signal_first_handle(signum); - handle != NULL && handle->signum == signum; - handle = RB_NEXT(uv__signal_tree_s, &uv__signal_tree, handle)) { - int r; - - msg.signum = signum; - msg.handle = handle; - - /* write() should be atomic for small data chunks, so the entire message - * should be written at once. In theory the pipe could become full, in - * which case the user is out of luck. - */ - do { - r = write(handle->loop->signal_pipefd[1], &msg, sizeof msg); - } while (r == -1 && errno == EINTR); - - assert(r == sizeof msg || - (r == -1 && (errno == EAGAIN || errno == EWOULDBLOCK))); - - if (r != -1) - handle->caught_signals++; - } - - uv__signal_unlock(); - errno = saved_errno; -} - - -static int uv__signal_register_handler(int signum) { - /* When this function is called, the signal lock must be held. */ - struct sigaction sa; - - /* XXX use a separate signal stack? */ - memset(&sa, 0, sizeof(sa)); - if (sigfillset(&sa.sa_mask)) - abort(); - sa.sa_handler = uv__signal_handler; - - /* XXX save old action so we can restore it later on? */ - if (sigaction(signum, &sa, NULL)) - return -errno; - - return 0; -} - - -static void uv__signal_unregister_handler(int signum) { - /* When this function is called, the signal lock must be held. */ - struct sigaction sa; - - memset(&sa, 0, sizeof(sa)); - sa.sa_handler = SIG_DFL; - - /* sigaction can only fail with EINVAL or EFAULT; an attempt to deregister a - * signal implies that it was successfully registered earlier, so EINVAL - * should never happen. - */ - if (sigaction(signum, &sa, NULL)) - abort(); -} - - -static int uv__signal_loop_once_init(uv_loop_t* loop) { - int err; - - /* Return if already initialized. */ - if (loop->signal_pipefd[0] != -1) - return 0; - - err = uv__make_pipe(loop->signal_pipefd, UV__F_NONBLOCK); - if (err) - return err; - - uv__io_init(&loop->signal_io_watcher, - uv__signal_event, - loop->signal_pipefd[0]); - uv__io_start(loop, &loop->signal_io_watcher, UV__POLLIN); - - return 0; -} - - -void uv__signal_loop_cleanup(uv_loop_t* loop) { - QUEUE* q; - - /* Stop all the signal watchers that are still attached to this loop. This - * ensures that the (shared) signal tree doesn't contain any invalid entries - * entries, and that signal handlers are removed when appropriate. - * It's safe to use QUEUE_FOREACH here because the handles and the handle - * queue are not modified by uv__signal_stop(). - */ - QUEUE_FOREACH(q, &loop->handle_queue) { - uv_handle_t* handle = QUEUE_DATA(q, uv_handle_t, handle_queue); - - if (handle->type == UV_SIGNAL) - uv__signal_stop((uv_signal_t*) handle); - } - - if (loop->signal_pipefd[0] != -1) { - uv__close(loop->signal_pipefd[0]); - loop->signal_pipefd[0] = -1; - } - - if (loop->signal_pipefd[1] != -1) { - uv__close(loop->signal_pipefd[1]); - loop->signal_pipefd[1] = -1; - } -} - - -int uv_signal_init(uv_loop_t* loop, uv_signal_t* handle) { - int err; - - err = uv__signal_loop_once_init(loop); - if (err) - return err; - - uv__handle_init(loop, (uv_handle_t*) handle, UV_SIGNAL); - handle->signum = 0; - handle->caught_signals = 0; - handle->dispatched_signals = 0; - - return 0; -} - - -void uv__signal_close(uv_signal_t* handle) { - - uv__signal_stop(handle); - - /* If there are any caught signals "trapped" in the signal pipe, we can't - * call the close callback yet. Otherwise, add the handle to the finish_close - * queue. - */ - if (handle->caught_signals == handle->dispatched_signals) { - uv__make_close_pending((uv_handle_t*) handle); - } -} - - -int uv_signal_start(uv_signal_t* handle, uv_signal_cb signal_cb, int signum) { - sigset_t saved_sigmask; - int err; - - assert(!(handle->flags & (UV_CLOSING | UV_CLOSED))); - - /* If the user supplies signum == 0, then return an error already. If the - * signum is otherwise invalid then uv__signal_register will find out - * eventually. - */ - if (signum == 0) - return -EINVAL; - - /* Short circuit: if the signal watcher is already watching {signum} don't - * go through the process of deregistering and registering the handler. - * Additionally, this avoids pending signals getting lost in the small time - * time frame that handle->signum == 0. - */ - if (signum == handle->signum) { - handle->signal_cb = signal_cb; - return 0; - } - - /* If the signal handler was already active, stop it first. */ - if (handle->signum != 0) { - uv__signal_stop(handle); - } - - uv__signal_block_and_lock(&saved_sigmask); - - /* If at this point there are no active signal watchers for this signum (in - * any of the loops), it's time to try and register a handler for it here. - */ - if (uv__signal_first_handle(signum) == NULL) { - err = uv__signal_register_handler(signum); - if (err) { - /* Registering the signal handler failed. Must be an invalid signal. */ - uv__signal_unlock_and_unblock(&saved_sigmask); - return err; - } - } - - handle->signum = signum; - RB_INSERT(uv__signal_tree_s, &uv__signal_tree, handle); - - uv__signal_unlock_and_unblock(&saved_sigmask); - - handle->signal_cb = signal_cb; - uv__handle_start(handle); - - return 0; -} - - -static void uv__signal_event(uv_loop_t* loop, - uv__io_t* w, - unsigned int events) { - uv__signal_msg_t* msg; - uv_signal_t* handle; - char buf[sizeof(uv__signal_msg_t) * 32]; - size_t bytes, end, i; - int r; - - bytes = 0; - end = 0; - - do { - r = read(loop->signal_pipefd[0], buf + bytes, sizeof(buf) - bytes); - - if (r == -1 && errno == EINTR) - continue; - - if (r == -1 && (errno == EAGAIN || errno == EWOULDBLOCK)) { - /* If there are bytes in the buffer already (which really is extremely - * unlikely if possible at all) we can't exit the function here. We'll - * spin until more bytes are read instead. - */ - if (bytes > 0) - continue; - - /* Otherwise, there was nothing there. */ - return; - } - - /* Other errors really should never happen. */ - if (r == -1) - abort(); - - bytes += r; - - /* `end` is rounded down to a multiple of sizeof(uv__signal_msg_t). */ - end = (bytes / sizeof(uv__signal_msg_t)) * sizeof(uv__signal_msg_t); - - for (i = 0; i < end; i += sizeof(uv__signal_msg_t)) { - msg = (uv__signal_msg_t*) (buf + i); - handle = msg->handle; - - if (msg->signum == handle->signum) { - assert(!(handle->flags & UV_CLOSING)); - handle->signal_cb(handle, handle->signum); - } - - handle->dispatched_signals++; - - /* If uv_close was called while there were caught signals that were not - * yet dispatched, the uv__finish_close was deferred. Make close pending - * now if this has happened. - */ - if ((handle->flags & UV_CLOSING) && - (handle->caught_signals == handle->dispatched_signals)) { - uv__make_close_pending((uv_handle_t*) handle); - } - } - - bytes -= end; - - /* If there are any "partial" messages left, move them to the start of the - * the buffer, and spin. This should not happen. - */ - if (bytes) { - memmove(buf, buf + end, bytes); - continue; - } - } while (end == sizeof buf); -} - - -static int uv__signal_compare(uv_signal_t* w1, uv_signal_t* w2) { - /* Compare signums first so all watchers with the same signnum end up - * adjacent. - */ - if (w1->signum < w2->signum) return -1; - if (w1->signum > w2->signum) return 1; - - /* Sort by loop pointer, so we can easily look up the first item after - * { .signum = x, .loop = NULL }. - */ - if (w1->loop < w2->loop) return -1; - if (w1->loop > w2->loop) return 1; - - if (w1 < w2) return -1; - if (w1 > w2) return 1; - - return 0; -} - - -int uv_signal_stop(uv_signal_t* handle) { - assert(!(handle->flags & (UV_CLOSING | UV_CLOSED))); - uv__signal_stop(handle); - return 0; -} - - -static void uv__signal_stop(uv_signal_t* handle) { - uv_signal_t* removed_handle; - sigset_t saved_sigmask; - - /* If the watcher wasn't started, this is a no-op. */ - if (handle->signum == 0) - return; - - uv__signal_block_and_lock(&saved_sigmask); - - removed_handle = RB_REMOVE(uv__signal_tree_s, &uv__signal_tree, handle); - assert(removed_handle == handle); - (void) removed_handle; - - /* Check if there are other active signal watchers observing this signal. If - * not, unregister the signal handler. - */ - if (uv__signal_first_handle(handle->signum) == NULL) - uv__signal_unregister_handler(handle->signum); - - uv__signal_unlock_and_unblock(&saved_sigmask); - - handle->signum = 0; - uv__handle_stop(handle); -} |