+++ /dev/null
-/*
- * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
- * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2 only,
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#include "lttng-sessiond.h"
-#include "utils.h"
-#include <common/utils.h>
-
-/*
- * Quit pipe for all threads. This permits a single cancellation point
- * for all threads when receiving an event on the pipe.
- */
-static int thread_quit_pipe[2] = { -1, -1 };
-
-/*
- * Init thread quit pipe.
- *
- * Return -1 on error or 0 if all pipes are created.
- */
-static int __init_thread_quit_pipe(int *a_pipe)
-{
- int ret, i;
-
- ret = pipe(a_pipe);
- if (ret < 0) {
- PERROR("thread quit pipe");
- goto error;
- }
-
- for (i = 0; i < 2; i++) {
- ret = fcntl(a_pipe[i], F_SETFD, FD_CLOEXEC);
- if (ret < 0) {
- PERROR("fcntl");
- goto error;
- }
- }
-
-error:
- return ret;
-}
-
-int sessiond_init_thread_quit_pipe(void)
-{
- return __init_thread_quit_pipe(thread_quit_pipe);
-}
-
-int sessiond_check_thread_quit_pipe(int fd, uint32_t events)
-{
- return (fd == thread_quit_pipe[0] && (events & LPOLLIN));
-}
-
-/*
- * Wait for a notification on the quit pipe (with a timeout).
- *
- * Returns 1 if the caller should quit, 0 if the timeout was reached, and
- * -1 if an error was encountered.
- */
-int sessiond_wait_for_quit_pipe(unsigned int timeout_us)
-{
- int ret;
- fd_set read_fds;
- struct timeval timeout;
-
- FD_ZERO(&read_fds);
- FD_SET(thread_quit_pipe[0], &read_fds);
- memset(&timeout, 0, sizeof(timeout));
- timeout.tv_usec = timeout_us;
-
- while (true) {
- ret = select(thread_quit_pipe[0] + 1, &read_fds, NULL, NULL,
- &timeout);
- if (ret < 0 && errno == EINTR) {
- /* Retry on interrupt. */
- continue;
- } else {
- break;
- }
- }
-
- if (ret > 0) {
- /* Should quit. */
- ret = 1;
- } else if (ret < 0 && errno != EINTR) {
- /* Unknown error. */
- PERROR("Failed to select() thread quit pipe");
- ret = -1;
- } else {
- /* Timeout reached. */
- ret = 0;
- }
-
- return ret;
-}
-
-int sessiond_notify_quit_pipe(void)
-{
- return notify_thread_pipe(thread_quit_pipe[1]);
-}
-
-void sessiond_close_quit_pipe(void)
-{
- utils_close_pipe(thread_quit_pipe);
-}
-
-static
-int __sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size,
- int *a_pipe)
-{
- int ret;
-
- assert(events);
-
- ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
- if (ret < 0) {
- goto error;
- }
-
- /* Add quit pipe */
- ret = lttng_poll_add(events, a_pipe[0], LPOLLIN | LPOLLERR);
- if (ret < 0) {
- goto error;
- }
-
- return 0;
-
-error:
- return ret;
-}
-
-/*
- * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
- */
-int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size)
-{
- return __sessiond_set_thread_pollset(events, size, thread_quit_pipe);
-}