daemon.c

来自「使用python调用tuxedo服务的代码, 中间以 c 调用tuxedo客户端」· C语言 代码 · 共 65 行

//#include "ofh.h"
#include <signal.h>

void
IgnoreAllSignal()
{
struct sigaction act;

	act.sa_handler = SIG_IGN;
	sigemptyset(&act.sa_mask);
	act.sa_flags=0;
	sigaction(SIGHUP,&act,NULL);
	sigaction(SIGCHLD,&act,NULL); 
	sigaction(SIGQUIT,&act,NULL);
	
	return ;
}

int
GenDaemon()
{
int childpid,fd;
int flag;

	if (getppid()==1) {
		/*chdir ("/");*/
		umask(0);
		IgnoreAllSignal();
		return 0;
	}
	
	IgnoreAllSignal();
	if ((childpid = fork())<0 ) {
		printf("can't fork first child %s %d\n",__FILE__,__LINE__);
		exit(-1);
	}
	else
		if (childpid > 0)
			exit(0);
	/*---if ((flag=setpgrp()) == -1) {
		printf("set process group err %s %d\n",__FILE__,__LINE__);
		exit(-2);
	}----*/

/****
	IgnoreAllSignal();
	if ((childpid = fork()) < 0) {
		printf("can't fork fist child %s %d\n",__FILE__,__LINE__);
		exit(-3);
	}
	else 
		if (childpid > 0)
			exit(0);
****/

	for (fd=3; fd<=8;fd++)
		close (fd);
	
	/* chdir("/"); */
	umask(0);
	IgnoreAllSignal();
	return 0;
}