[C 语言] 管道通信 (pipe)

1. 父子进程 pipe 通信
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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>

int main()
{
    pid_t pid;
    int pipe_fds[2];
    char buffer[32];
    int result;

    memset(buffer, 0, 32);
    result = pipe(pipe_fds);
    if(result == -1) {
        printf("pipe error!\n");
        exit(1);
    }

    pid = fork();
    if(pid < 0) {
        printf("fork error!\n");
        exit(0);
    } else if(pid == 0) { // child
        close(pipe_fds[1]);
        sleep(3);
        if(-1 != read(pipe_fds[0], buffer, 32))
            printf("receive data from parent, %s!\n", buffer);
        else
            printf("read error!\n");
        close(pipe_fds[0]);
    } else if(pid > 0) { // parent
        close(pipe_fds[0]);
        sleep(1);
        char *word = "hello";
        if(-1 != write(pipe_fds[1], word, strlen(word)))
            printf("send data to child, %s!\n", word);
        else
            printf("write error!\n");
        close(pipe_fds[1]);
    exit(0);
}
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