pipe1.c

unix高级编程源代码.<<unix高级编程>>

#include	"ourhdr.h"

int
main(void)
{
	int		n, fd[2];
	pid_t	pid;
	char	line[MAXLINE];

	if (pipe(fd) < 0)
		err_sys("pipe error");

	if ( (pid = fork()) < 0)
		err_sys("fork error");

	else if (pid > 0) {		/* parent */
		close(fd[0]);
		write(fd[1], "hello world\n", 12);

	} else {				/* child */
		close(fd[1]);
		n = read(fd[0], line, MAXLINE);
		write(STDOUT_FILENO, line, n);
	}

	exit(0);
}