mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2025-01-01 11:24:25 +08:00
9dd8d5f870
A recent commit added a write to the watchdog test code for doing the "magic
close", but that caused a compile-time warning:
Documentation/watchdog/src/watchdog-test.c: In function ‘main’:
Documentation/watchdog/src/watchdog-test.c:94:5: warning: ignoring return value of ‘write’, declared with attribute warn_unused_result [-Wunused-result]
This changes the code to print a runtime warning if the write fails.
Fixes: 5a2d3de196 ("Documentation/watchdog: add support for magic close to watchdog-test")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Timur Tabi <timur@codeaurora.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
106 lines
2.3 KiB
C
106 lines
2.3 KiB
C
/*
|
|
* Watchdog Driver Test Program
|
|
*/
|
|
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <signal.h>
|
|
#include <sys/ioctl.h>
|
|
#include <linux/types.h>
|
|
#include <linux/watchdog.h>
|
|
|
|
int fd;
|
|
const char v = 'V';
|
|
|
|
/*
|
|
* This function simply sends an IOCTL to the driver, which in turn ticks
|
|
* the PC Watchdog card to reset its internal timer so it doesn't trigger
|
|
* a computer reset.
|
|
*/
|
|
static void keep_alive(void)
|
|
{
|
|
int dummy;
|
|
|
|
printf(".");
|
|
ioctl(fd, WDIOC_KEEPALIVE, &dummy);
|
|
}
|
|
|
|
/*
|
|
* The main program. Run the program with "-d" to disable the card,
|
|
* or "-e" to enable the card.
|
|
*/
|
|
|
|
static void term(int sig)
|
|
{
|
|
int ret = write(fd, &v, 1);
|
|
|
|
close(fd);
|
|
if (ret < 0)
|
|
printf("\nStopping watchdog ticks failed (%d)...\n", errno);
|
|
else
|
|
printf("\nStopping watchdog ticks...\n");
|
|
exit(0);
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
int flags;
|
|
unsigned int ping_rate = 1;
|
|
int ret;
|
|
|
|
setbuf(stdout, NULL);
|
|
|
|
fd = open("/dev/watchdog", O_WRONLY);
|
|
|
|
if (fd == -1) {
|
|
printf("Watchdog device not enabled.\n");
|
|
exit(-1);
|
|
}
|
|
|
|
if (argc > 1) {
|
|
if (!strncasecmp(argv[1], "-d", 2)) {
|
|
flags = WDIOS_DISABLECARD;
|
|
ioctl(fd, WDIOC_SETOPTIONS, &flags);
|
|
printf("Watchdog card disabled.\n");
|
|
goto end;
|
|
} else if (!strncasecmp(argv[1], "-e", 2)) {
|
|
flags = WDIOS_ENABLECARD;
|
|
ioctl(fd, WDIOC_SETOPTIONS, &flags);
|
|
printf("Watchdog card enabled.\n");
|
|
goto end;
|
|
} else if (!strncasecmp(argv[1], "-t", 2) && argv[2]) {
|
|
flags = atoi(argv[2]);
|
|
ioctl(fd, WDIOC_SETTIMEOUT, &flags);
|
|
printf("Watchdog timeout set to %u seconds.\n", flags);
|
|
goto end;
|
|
} else if (!strncasecmp(argv[1], "-p", 2) && argv[2]) {
|
|
ping_rate = strtoul(argv[2], NULL, 0);
|
|
printf("Watchdog ping rate set to %u seconds.\n", ping_rate);
|
|
} else {
|
|
printf("-d to disable, -e to enable, -t <n> to set " \
|
|
"the timeout,\n-p <n> to set the ping rate, and \n");
|
|
printf("run by itself to tick the card.\n");
|
|
goto end;
|
|
}
|
|
}
|
|
|
|
printf("Watchdog Ticking Away!\n");
|
|
|
|
signal(SIGINT, term);
|
|
|
|
while(1) {
|
|
keep_alive();
|
|
sleep(ping_rate);
|
|
}
|
|
end:
|
|
ret = write(fd, &v, 1);
|
|
if (ret < 0)
|
|
printf("Stopping watchdog ticks failed (%d)...\n", errno);
|
|
close(fd);
|
|
return 0;
|
|
}
|