example21.c

LinuxNetProgramming Linux网络编程基础实例

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

int main(void)
{
	int		n, fd[2];
	pid_t	pid;
	char	line[1024];

	if (pipe(fd) < 0)
		exit(0);
	if ( (pid = fork()) < 0)
		exit(0);
	else if (pid > 0) {		/* parent */
		close(fd[0]);
		write(fd[1], "I am from parent!\n", 19);
	}
else {				/* child */
		close(fd[1]);
		n = read(fd[0], line, 1024);
		write(STDOUT_FILENO, line, n);
	}
	exit(0);
}