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
Device Drivers ―>
配置好好后，即可make
应用层的使用，直接上代码
#include <stdio.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <errno.h> #include <pthread.h> #include <sys/ioctl.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> #include <sys/time.h> #include <unistd.h> #include <time.h> #include <getopt.h> #include <sys/signal.h> //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; } 来源：博客园
作者：陈昌雄
链接：https://www.cnblogs.com/ChenChangXiong/p/11526791.html