linux看门狗使用很简单,在应用层使用,只需要ioctl设置一下溢出时间,既可以使用看门狗,定时喂狗即可
前提是kernel支持看门狗
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
//watchdog
#define WATCHDOG_IOCTL_BASE 'W'
struct watchdog_info {
unsigned int opTIons; /* OpTIons the card/driver supports */
unsigned int firmware_version; /* Firmware version of the card */
char idenTIty[32]; /* IdenTIty of the board */
};
#define WDIOC_GETSUPPORT _IOR(WATCHDOG_IOCTL_BASE, 0, struct watchdog_info)
#define WDIOC_GETSTATUS _IOR(WATCHDOG_IOCTL_BASE, 1, int)
#define WDIOC_GETBOOTSTATUS _IOR(WATCHDOG_IOCTL_BASE, 2, int)
#define WDIOC_GETTEMP _IOR(WATCHDOG_IOCTL_BASE, 3, int)
#define WDIOC_SETOPTIONS _IOR(WATCHDOG_IOCTL_BASE, 4, int)
#define WDIOC_KEEPALIVE _IOR(WATCHDOG_IOCTL_BASE, 5, int)
#define WDIOC_SETTIMEOUT _IOWR(WATCHDOG_IOCTL_BASE, 6, int)
#define WDIOC_GETTIMEOUT _IOR(WATCHDOG_IOCTL_BASE, 7, int)
#define WDIOC_SETPRETIMEOUT _IOWR(WATCHDOG_IOCTL_BASE, 8, int)
#define WDIOC_GETPRETIMEOUT _IOR(WATCHDOG_IOCTL_BASE, 9, int)
#define WDIOC_GETTIMELEFT _IOR(WATCHDOG_IOCTL_BASE, 10, int)
#define WDIOF_OVERHEAT 0x0001 /* Reset due to CPU overheat */
#define WDIOF_FANFAULT 0x0002 /* Fan failed */
#define WDIOF_EXTERN1 0x0004 /* External relay 1 */
#define WDIOF_EXTERN2 0x0008 /* External relay 2 */
#define WDIOF_POWERUNDER 0x0010 /* Power bad/power fault */
#define WDIOF_CARDRESET 0x0020 /* Card previously reset the CPU */
#define WDIOF_POWEROVER 0x0040 /* Power over voltage */
#define WDIOF_SETTIMEOUT 0x0080 /* Set timeout (in seconds) */
#define WDIOF_MAGICCLOSE 0x0100 /* Supports magic close char */
#define WDIOF_PRETIMEOUT 0x0200 /* Pretimeout (in seconds), get/set */
#define WDIOF_KEEPALIVEPING 0x8000 /* Keep alive ping reply */
#define WDIOS_DISABLECARD 0x0001 /* Turn off the watchdog timer */
#define WDIOS_ENABLECARD 0x0002 /* Turn on the watchdog timer */
#define WDIOS_TEMPPANIC 0x0004 /* Kernel panic on temperature trip */
int wdt_fd;
int time_out = 5;
void stop_signal()
{
int i = 0 , ret = 0 ;
i = WDIOS_DISABLECARD ;
ioctl(wdt_fd, WDIOC_SETOPTIONS, &i) ;
printf("===watchdow will be closed===\n") ;
close(wdt_fd) ;
exit(0) ;
}
int main(int argc, char *argv[])
{
int new_time;
int i;
int ret, count = 10;
struct watchdog_info wdt_info;
signal(SIGINT, stop_signal) ;
wdt_fd = open("/dev/watchdog", O_RDWR);
if(wdt_fd == -1)
perror("Open Watchdog ERROR!\n");
//get watchdog infomation struct
ioctl(wdt_fd, WDIOC_GETSUPPORT, &wdt_info);
//printf("options=%d,id=%s\n", wdt_info.options, wdt_info.identity);
ioctl(wdt_fd, WDIOC_SETTIMEOUT, &time_out);
while(1)
{
ioctl(wdt_fd,WDIOC_KEEPALIVE,NULL);
sleep(atoi(argv[1]));
}
close(wdt_fd);
return 0;
}