管道的例子

#include <stdio.h>#include <unistd.h>#include <stdlib.h>#include <string.h>int pipe_test[2];  int main(){    pid_t pid;    char buffer[32];    memset(buffer, 0, 32);    if(pipe(pipe_test) < 0)    {        printf("Failed to create pipe!\n");        return 0;    }    if(0 == (pid = fork()))    {        close(pipe_test[1]);        sleep(3);        if(read(pipe_test[0], buffer, 32) > 0)        {            printf("Receive data from server, %s!\n", buffer);        }        close(pipe_test[0]);    }    else    {        close(pipe_test[0]);        if(-1 != write(pipe_test[1], "hello", strlen("hello")))        {            printf("Send data to client, hello!\n");        }        close(pipe_test[1]);        waitpid(pid, NULL, 0);    }    return 1;}