[UNIX]孤儿进程实验

#include <apue.h>

#include <errno.h>

static void sig_hup(int signo)
{
	printf("SIGHUP received, pid=%ld, ppid=%ld\n",(long)getpid(),(long)getppid());
}

static void pr_ids(char *name)
{
	printf("%s: pid = %ld, ppid= %ld, pgrp= %ld,tpgrp= %ld\n",
			name,(long)getpid(),(long)getppid(),(long)getpgrp(),
			(long)tcgetpgrp(STDIN_FILENO));
	fflush(stdout);
}

int main(void)
{
	char c;
	pid_t pid;
	pr_ids("parent");
	if((pid = fork()) < 0)
		err_sys("fork error");
	else if(pid > 0)
		sleep(5);
	else{
		pr_ids("child");
		signal(SIGHUP,sig_hup);
		kill(getpid(),SIGTSTP);
		pr_ids("child");
		if(read(STDIN_FILENO,&c,1) != 1)
			printf("read error %d on controlling TTY\n",errno);
	}

	exit(0);
}

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