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

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>

int
main(int argc, char *argv[])
{
	pid_t child;

	printf("pgid = %d\n", getpgrp());

	child = fork();
	if (child == 0) {
		struct termios termios_p;

		printf("forked, pgid = %d\n", getpgrp());

		if (setpgrp() == -1) {
			printf("error: setpgid: %s\n", strerror(errno));
			exit(EXIT_FAILURE);
		}

		printf("new pgid = %d\n", getpgrp());

		if (tcgetattr(STDIN_FILENO, &termios_p) == -1) {
			printf("error: tcgetattr: %s\n", strerror(errno));
			exit(EXIT_FAILURE);
		}

		if (tcsetattr(STDIN_FILENO, 0, &termios_p) == -1) {
			printf("error: tcsetattr: %s\n", strerror(errno));
			exit(EXIT_FAILURE);
		}

		exit(EXIT_SUCCESS);
	}

	printf("forked, child = %d\n", child);

	while (1) {
		pid_t pid;
		int status;

		pid = wait(&status);
		if (pid == -1) {
			printf("error: wait: %s\n", strerror(errno));
			exit(EXIT_FAILURE);
		}

		printf("pid %d status %d\n", pid, status);
	}

	return EXIT_SUCCESS;
}