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A software watchdog timer for linux. Support multiple watchdogs.
License: Other
This project forked from sunmingbao/soft-wdt
A software watchdog timer for linux. Support multiple watchdogs.
License: Other
soft_wdt软件看门狗简介 ====================== soft_wdt(以下简称本软件)是一个软件实现的Linux看门狗, 他和/drivers/watchdog/softdog.c实现的软件看门狗几乎一样。 主要的不同点是,前者支持一个看门狗,本软件则支持大量的看门狗。 soft_wdt代码编译后,生成一个内核模块soft_wdt.ko。 模块加载后,将创建一个设备文件/dev/soft_wdt 用户态程序,通过系统调用open每打开一次/dev/soft_wdt,就得到一个新的看门狗, 此看门狗的使用方法就和普通的看门狗一样。 例如: 1) 向fd写入任何数据,就等于是喂狗。 2) 用户可以通过ioctl对看门狗进行各种操作。 3) 如果模拟加载时,模块参数nowayout的值为0, 那么当用户向fd写入一次含有字符V(注意,是大写)的数据时, 就将此看门狗设置成了可关闭的。 下面具体说说使用方法: (一)编译看门狗 见Build.txt (二)加载看门狗 本软件提供的模块参数如下。用户可根据需要进行指定。 nowayout - 一旦启动看门狗,不可以停止 (0,no;1,yes。default=0) timeout - 看门狗超时时间,单位:秒。 (0 ~ 65536, default=5) no_reboot - 看门狗超时,不重启系统 。(0,no; 1,yes default=0) core_dump_ill_task - 看门狗超时时,core dump异常任务,(0,no; 1,yes default=1) 注意,core dump是通过向异常线程发送SIGABRT信号实现的。 因此,如果使用看门狗的程序,想自己记录异常信息,可以通过捕获SIGABRT信号来实现。 下面是加载命令的示例。 1. 使用默认参数加载(默认值如上面所列) insmod soft_wdt.ko 2. 指定参数加载(12秒超时,看门狗可关闭,超时不重启机器) insmod soft_wdt.ko timeout=12 nowayout=0 no_reboot=1 (三)用户态程序使用看门狗 //以下是示例代码 #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <sys/ioctl.h> #include <linux/watchdog.h> #define SOFT_WDT_DEV "/dev/soft_wdt" int feed_dog_cnt; int feed_dog_gap; int main(int argc, char *argv[]) { int i; int timeout; struct watchdog_info ident; int fd; if (argc<3) { printf("usage:\n %s <feed_gap(in seconds)> <feed_cnt>\n", argv[0]); return 0; } fd=open("/dev/soft_wdt", O_WRONLY); if (fd < 0) { printf("open %s failed\n", SOFT_WDT_DEV); exit(1); } printf("open %s succeed\n", SOFT_WDT_DEV); timeout = 7; printf("set timeout to %d\n", timeout); ioctl(fd, WDIOC_SETTIMEOUT, &timeout); timeout = 0; ioctl(fd, WDIOC_GETTIMEOUT, &timeout); printf("get timeout returns %d\n", timeout); ioctl(fd, WDIOC_GETSUPPORT, &ident); printf("dog name is %s\n", ident.identity); printf("make the dog closable\n"); write(fd, "V", 1); feed_dog_gap = atoi(argv[1]); feed_dog_cnt = atoi(argv[2]); for (i=0; i<feed_dog_cnt; i++) { printf("feed dog\n"); write(fd, "1234", 4); usleep(feed_dog_gap*1000000); } printf("stop feeding dog\n"); while (1) { usleep(1000000); } return 0; } ====================== 本软件是一款开源、免费软件。 具体版权说明见COPYING.txt。 ====================== 主要的版本历史: 2014年11月,1.0发布 2015年03月,2.0发布 ====================== 作者: 孙明保(来自 ZTE中兴) 邮箱: [email protected] QQ : 7743896
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