mirror of
https://github.com/troglobit/finit.git
synced 2026-10-02 05:52:48 +07:00
138 lines
2.9 KiB
C
138 lines
2.9 KiB
C
/* Built-in watchdog daemon
|
|
*
|
|
* Copyright (c) 2016 Joachim Nilsson <troglobit@gmail.com>
|
|
*
|
|
* 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 <paths.h>
|
|
#include <signal.h>
|
|
#include <sys/un.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/socket.h>
|
|
#include <linux/watchdog.h>
|
|
|
|
#include "finit.h"
|
|
#include "helpers.h"
|
|
#include "util.h"
|
|
#include "watchdog.h"
|
|
|
|
int running = 1;
|
|
int handover = 0;
|
|
|
|
static int notify(void)
|
|
{
|
|
int sd, result = 255;
|
|
ssize_t len;
|
|
struct sockaddr_un sun = {
|
|
.sun_family = AF_UNIX,
|
|
.sun_path = INIT_SOCKET,
|
|
};
|
|
struct init_request rq;
|
|
|
|
sd = socket(AF_UNIX, SOCK_STREAM, 0);
|
|
if (-1 == sd)
|
|
return -1;
|
|
|
|
if (connect(sd, (struct sockaddr*)&sun, sizeof(sun)) == -1)
|
|
goto exit;
|
|
|
|
rq.cmd = INIT_CMD_WDOG_HELLO;
|
|
rq.magic = INIT_MAGIC;
|
|
rq.runlevel = getpid();
|
|
len = sizeof(rq);
|
|
if (write(sd, &rq, len) != len)
|
|
goto exit;
|
|
|
|
if (read(sd, &rq, len) != len)
|
|
goto exit;
|
|
|
|
result = 0;
|
|
exit:
|
|
close(sd);
|
|
return result;
|
|
}
|
|
|
|
static void sighandler(int signo)
|
|
{
|
|
if (signo == SIGTERM)
|
|
handover = 1;
|
|
running = 0;
|
|
}
|
|
|
|
static int init(char *progname, char *devnode, int timeout)
|
|
{
|
|
int fd;
|
|
|
|
sprintf(progname, "@finit-watchdog");
|
|
signal(SIGTERM, sighandler);
|
|
signal(SIGPWR, sighandler);
|
|
|
|
fd = open(devnode, O_WRONLY);
|
|
if (fd == -1)
|
|
return -1;
|
|
|
|
ioctl(fd, WDIOC_SETTIMEOUT, &timeout);
|
|
|
|
return fd;
|
|
}
|
|
|
|
static int loop(int fd)
|
|
{
|
|
int done = 0;
|
|
|
|
while (running) {
|
|
do_sleep(1);
|
|
ioctl(fd, WDIOC_KEEPALIVE, &done);
|
|
|
|
if (!done && !notify())
|
|
done = 1;
|
|
}
|
|
|
|
if (handover)
|
|
return !write(fd, "V", 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void watchdog(char *progname)
|
|
{
|
|
if (fork() == 0) {
|
|
int fd, ret;
|
|
|
|
fd = init(progname, WDT_DEVNODE, WDT_TIMEOUT);
|
|
if (fd == -1) {
|
|
_pe("Failed connecting to watchdog %s", WDT_DEVNODE);
|
|
_exit(1);
|
|
}
|
|
|
|
ret = loop(fd);
|
|
close(fd);
|
|
|
|
_exit(ret);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Local Variables:
|
|
* indent-tabs-mode: t
|
|
* c-file-style: "linux"
|
|
* End:
|
|
*/
|