pipe1.c

unix环境高级编程的源代码

#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);
}