group_id_sample.c

创建守护进程

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



int main(int argc,char *argv[])
{
	pid_t child;
	printf("getpid=%d\n",getpid());
	printf("group id=%d\n",getpgrp());
	child=fork();
	if(child==0)
	{
		printf("child group id=%d\n",getpgid(getpid()));
		setpgid(0,0);
		printf("new group id=%d\n",getpgrp());
		exit(0);
	}
	return 0;
}