chang_gpid.c

linux下守护进程的实现源代码对于学习守护进程有很大帮助

#include <unistd.h>
#include <sys/types.h>
#include <stdlib.h>


int main(int argc,char *argv[])
{
	pid_t child;
	int pid=atoi(argv[1]);
	child=fork();
	if(child==0)
	{
		printf("child group id %d\n",getpgrp());
		if(setpgid(0,2114)==-1)
			printf("dddd\n");
		printf("child group id %d\n",getpgrp());
	}
	else if (child>0)
	{
		sleep(4);
	}
	return 0;
}