用c实现进程监控，如果某一进程退出则重启

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <fcntl.h>#include <sys/types.h>#include <sys/stat.h>#include <linux/types.h>  #include <sys/wait.h>#include <errno.h>#include <unistd.h>//要监控的程序#define P1 "hello1"#define P2 "hello2"#define P3 "hello3"#define PATH "."/*****************************/int is_run(char *name);void killall_hello(void);/*****************************///运行返回1，没有运行返回0int is_run(char *name){    int ret = -1;    char buf[256] = {'\0'};    snprintf(buf, sizeof(buf), "pidof %s >> /dev/null", name);     ret = system(buf);    if(!WEXITSTATUS(ret)){ //#include <sys/wait.h>        printf("%s is running!\n", name);        return 1;    }    else{        printf("%s is not running!\n", name);        return 0;    }}void killall_hello(void){     char buf[128] = {'\0'};    snprintf(buf, sizeof(buf), "killall %s", P1);    system(buf);    snprintf(buf, sizeof(buf), "killall %s", P2);    system(buf);    snprintf(buf, sizeof(buf), "killall %s", P3);    system(buf);}int main(int argc, char **argv){    int p1_ret = -1;    int p2_ret = -1;    int p3_ret = -1;    char buf[128];    bzero(buf, sizeof(buf));    while(1){    p1_ret = is_run(P1);    p2_ret = is_run(P2);    p3_ret = is_run(P3);    if (!(p1_ret && p2_ret && p3_ret))    {        killall_hello();         printf("rerun hello3\n");        snprintf(buf, sizeof(buf), "%s/%s &", PATH, P3);        system(buf);    //打印日志信息    system("date >> w.log");    if(!p1_ret){        snprintf(buf, sizeof(buf), "echo %s not run , killall , run %s >> w.log", P1, P3);        system(buf);    }else if(!p2_ret){        snprintf(buf, sizeof(buf), "echo %s not run , killall , run %s >> w.log", P2, P3);        system(buf);    }else if(!p3_ret){        snprintf(buf, sizeof(buf), "echo %s not run , killall , run %s >> w.log", P3, P3);        system(buf);            }        }    sleep(5);    }    exit(0);}