https://jackxiang.com/index.php zh-cn https://jackxiang.com/post// jack <xdy108@126.com> Fri, 11 Aug 2017 12:30:50 +0000 https://jackxiang.com/post// 下面就是一个通过向进程发送Signal信号以该进程退出，重新起了一新的子进程，用到了kill -HUP PID，主要是学习HUP信号的C语言编码方法。
#include <stdio.h> #include <string.h> #include <stdlib.h> #include <signal.h> #include <unistd.h> #include <errno.h> #include <syslog.h> #include <stdarg.h> char **bak_argv; int flag = 0; void restart(void); void sighup_handler(int sig); // argv[0] 尽量使用绝对路径, 因为程序执行过程中可能会使用 chdir() . int main(int argc, char *argv[]) { openlog("sig_hup", LOG_PID, 0); syslog(LOG_ERR, "%s", argv[0]); closelog(); bak_argv = argv; signal(SIGHUP, sighup_handler); while(1) {   if(flag)    restart();   sleep(10); } return 0; } void sighup_handler(int sig) { flag = 1; } void restart(void) { switch(fork()) {   case -1:    openlog("sig_hup", LOG_PID, 0);    syslog(LOG_ERR, "fork failed: %s", strerror(errno));    closelog();    exit(EXIT_FAILURE);    break;   case 0:    break;   default:    exit(EXIT_SUCCESS); } execv(bak_argv[0], bak_argv); openlog("sig_hup", LOG_PID, 0); syslog(LOG_ERR, "execv(%s, ...) failed: %s\n", bak_argv[0], strerror(errno)); closelog(); exit(EXIT_FAILURE); }

gcc 编译：
gcc nohup.c -o b.out

运行：
./a.out


ps aux|grep b.out
root      4919  0.0  0.1   4296  1328 pts/6    S+   20:22   0:00 ./b.out

kill -HUP 4919

#ps aux|grep b.out
root      4958  0.0  0.1   4296  1324 pts/6    S    20:23   0:00 ./b.out

From:http://www.jb51.net/article/37422.htm ]]> https://jackxiang.com/post//#blogcomment <user@domain.com> Thu, 01 Jan 1970 00:00:00 +0000 https://jackxiang.com/post//#blogcomment