116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include <time.h>
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#include <getopt.h>
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#include <sys/signal.h>
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#include <termios.h>
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struct watchdog_info{
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unsigned int options; //options the card/driver supprots 19
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unsigned int firmware_version; //firmcard version of the card
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unsigned char identity[32]; //identity of the board 21
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};
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#define WATCHDOG_IOCTL_BASE 'W'
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#define WDIOC_GETSUPPORT _IOR(WATCHDOG_IOCTL_BASE, 0, struct watchdog_info)
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#define WDIOC_SETTIMEOUT _IOWR(WATCHDOG_IOCTL_BASE, 6, int)
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#define WDIOC_GETTIMEOUT _IOR(WATCHDOG_IOCTL_BASE, 7, int) //27
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#define WDIOS_DISABLECARD 0x0001
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#define WDIOS_ENABLECARD 0x0002
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#define WDIOC_SETOPTIONS _IOR(WATCHDOG_IOCTL_BASE, 4, int)
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#define WDIOC_KEEPALIVE _IOR(WATCHDOG_IOCTL_BASE, 5, int)
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int Getch (void) //无回显的从屏幕输入字符，来达到喂狗的目的
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{
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int ch;
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struct termios oldt, newt; //终端设备结构体
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tcgetattr(STDIN_FILENO, &oldt); //获得终端属性
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newt = oldt;
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newt.c_lflag &= ~(ECHO|ICANON); //设置无回显属性
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tcsetattr(STDIN_FILENO, TCSANOW, &newt); //设置新的终端属性
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ch = getchar(); //从键盘输入一个数据
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tcsetattr(STDIN_FILENO, TCSANOW, &oldt); //恢复终端设备初始设置
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return ch;
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}
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//suspend some seconds
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int zsleep(int millisecond)
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{
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unsigned long usec;
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usec=1000*millisecond;
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usleep(usec); //usleep(1)睡眠一微秒（10E-6),这里也就是0.1s
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}
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int Init()
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{
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int fd;
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//open device file
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fd = open("/dev/watchdog",O_RDWR); //打开看门狗设备
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if(fd < 0)
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{
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printf("device open fail\n");
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return -1;
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}
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printf("open success\n");
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return fd;
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}
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int main(int argc,char **argv)
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{
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int fd,ch;
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int i,j;
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char c;
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struct watchdog_info wi;
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if(argc != 2){
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printf("Usage : ./watchdog 10\n");
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return -1;
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}
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fd=Init(); //打开终端看门狗设备
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ioctl(fd, WDIOC_SETOPTIONS, WDIOS_ENABLECARD);
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//读板卡信息，但不常用
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ioctl(fd,WDIOC_GETSUPPORT,&wi);
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printf("options is %d,identity is %s\n",wi.options,wi.identity);
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//读看门狗溢出时间
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printf("put_usr return,if 0,success:%d\n",ioctl(fd,WDIOC_GETTIMEOUT,&i));
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printf("The old reset time is: %d\n", i);
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//关闭
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i=WDIOS_DISABLECARD;//WDIOC_SETOPTIONS=0X0001
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printf("return ENOTTY,if -1,success:%d\n",ioctl(fd,WDIOC_SETOPTIONS,&i));
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//打开
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i=WDIOS_ENABLECARD;//WDIOS_ENABLECARD 0x0002
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printf("return ENOTTY,if -1,success:%d\n",ioctl(fd,WDIOC_SETOPTIONS,&i));
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i=atoi(argv[1]);
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printf("put_user return,if 0,success:%d\n",ioctl(fd,WDIOC_SETTIMEOUT,&i));
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//读新的设置时间
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printf("put_usr return,if 0,success:%d\n",ioctl(fd,WDIOC_GETTIMEOUT,&i));
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while(1)
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{
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zsleep(100);
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if((c=Getch())!=27){
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//输入如果不是ESC，就喂狗，否则不喂狗，到时间后系统重启
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printf("keep alive \n");
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ioctl(fd,WDIOC_KEEPALIVE,NULL);
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//write(fd,NULL,1); //同样是喂狗
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}
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}
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close(fd); //关闭设备
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return 0;
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}
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