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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license from the top-level
* OPENSOLARIS.LICENSE or <http://opensource.org/licenses/CDDL-1.0>.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each file
* and include the License file from the top-level OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Developed at Lawrence Livermore National Laboratory (LLNL-CODE-403049).
* Copyright (C) 2013-2014 Lawrence Livermore National Security, LLC.
*/
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
#include "zed.h"
#include "zed_conf.h"
#include "zed_event.h"
#include "zed_file.h"
#include "zed_log.h"
static volatile sig_atomic_t _got_exit = 0;
static volatile sig_atomic_t _got_hup = 0;
/*
* Signal handler for SIGINT & SIGTERM.
*/
static void
_exit_handler(int signum)
{
_got_exit = 1;
}
/*
* Signal handler for SIGHUP.
*/
static void
_hup_handler(int signum)
{
_got_hup = 1;
}
/*
* Register signal handlers.
*/
static void
_setup_sig_handlers(void)
{
struct sigaction sa;
if (sigemptyset(&sa.sa_mask) < 0)
zed_log_die("Failed to initialize sigset");
sa.sa_flags = SA_RESTART;
sa.sa_handler = SIG_IGN;
if (sigaction(SIGPIPE, &sa, NULL) < 0)
zed_log_die("Failed to ignore SIGPIPE");
sa.sa_handler = _exit_handler;
if (sigaction(SIGINT, &sa, NULL) < 0)
zed_log_die("Failed to register SIGINT handler");
if (sigaction(SIGTERM, &sa, NULL) < 0)
zed_log_die("Failed to register SIGTERM handler");
sa.sa_handler = _hup_handler;
if (sigaction(SIGHUP, &sa, NULL) < 0)
zed_log_die("Failed to register SIGHUP handler");
}
/*
* Lock all current and future pages in the virtual memory address space.
* Access to locked pages will never be delayed by a page fault.
* EAGAIN is tested up to max_tries in case this is a transient error.
*/
static void
_lock_memory(void)
{
#if ! _POSIX_MEMLOCK
zed_log_die("Failed to lock memory pages: mlockall() not supported");
#else /* _POSIX_MEMLOCK */
int i = 0;
const int max_tries = 10;
for (i = 0; i < max_tries; i++) {
if (mlockall(MCL_CURRENT | MCL_FUTURE) == 0) {
zed_log_msg(LOG_INFO, "Locked all pages in memory");
return;
}
if (errno != EAGAIN)
break;
}
zed_log_die("Failed to lock memory pages: %s", strerror(errno));
#endif /* _POSIX_MEMLOCK */
}
/*
* Transform the process into a daemon.
*/
static void
_become_daemon(void)
{
pid_t pid;
int fd;
pid = fork();
if (pid < 0) {
zed_log_die("Failed to create child process: %s",
strerror(errno));
} else if (pid > 0) {
_exit(EXIT_SUCCESS);
}
if (setsid() < 0)
zed_log_die("Failed to create new session: %s",
strerror(errno));
pid = fork();
if (pid < 0) {
zed_log_die("Failed to create grandchild process: %s",
strerror(errno));
} else if (pid > 0) {
_exit(EXIT_SUCCESS);
}
fd = open("/dev/null", O_RDWR);
if (fd < 0)
zed_log_die("Failed to open /dev/null: %s", strerror(errno));
if (dup2(fd, STDIN_FILENO) < 0)
zed_log_die("Failed to dup /dev/null onto stdin: %s",
strerror(errno));
if (dup2(fd, STDOUT_FILENO) < 0)
zed_log_die("Failed to dup /dev/null onto stdout: %s",
strerror(errno));
if (dup2(fd, STDERR_FILENO) < 0)
zed_log_die("Failed to dup /dev/null onto stderr: %s",
strerror(errno));
if (close(fd) < 0)
zed_log_die("Failed to close /dev/null: %s", strerror(errno));
}
/*
* ZFS Event Daemon (ZED).
*/
int
main(int argc, char *argv[])
{
struct zed_conf *zcp;
uint64_t saved_eid;
int64_t saved_etime[2];
zed_log_init(argv[0]);
zed_log_stderr_open(LOG_NOTICE);
zcp = zed_conf_create();
zed_conf_parse_opts(zcp, argc, argv);
if (zcp->do_verbose)
zed_log_stderr_open(LOG_INFO);
if (geteuid() != 0)
zed_log_die("Must be run as root");
(void) umask(0);
_setup_sig_handlers();
zed_conf_parse_file(zcp);
zed_file_close_from(STDERR_FILENO + 1);
if (chdir("/") < 0)
zed_log_die("Failed to change to root directory");
if (zed_conf_scan_dir(zcp) < 0)
exit(EXIT_FAILURE);
if (zcp->do_memlock)
_lock_memory();
if (!zcp->do_foreground) {
_become_daemon();
zed_log_syslog_open(LOG_DAEMON);
zed_log_stderr_close();
}
zed_log_msg(LOG_NOTICE,
"ZFS Event Daemon %s-%s", ZFS_META_VERSION, ZFS_META_RELEASE);
(void) zed_conf_write_pid(zcp);
if (zed_conf_open_state(zcp) < 0)
exit(EXIT_FAILURE);
if (zed_conf_read_state(zcp, &saved_eid, saved_etime) < 0)
exit(EXIT_FAILURE);
zed_event_init(zcp);
zed_event_seek(zcp, saved_eid, saved_etime);
while (!_got_exit) {
if (_got_hup) {
_got_hup = 0;
(void) zed_conf_scan_dir(zcp);
}
zed_event_service(zcp);
}
zed_log_msg(LOG_NOTICE, "Exiting");
zed_event_fini(zcp);
zed_conf_destroy(zcp);
zed_log_fini();
exit(EXIT_SUCCESS);
}
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