93 lines
2.0 KiB
C
93 lines
2.0 KiB
C
#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <string.h>
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// 单机聊天工具 (bob方)
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int main(int argc, char const *argv[])
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{
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// 使用方法 gcc xx.c -D CREATE_FIFO 会在运行时执行预处理区段
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#ifdef CREATE_FIFO
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mkfifo("fifo_bob_to_lucy", 0644);
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mkfifo("fifo_lucy_to_bob", 0644);
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#endif
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if (mkfifo("fifo_bob_to_lucy", 0644) != -1)
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{
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if (errno != EEXIST)
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{
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perror("fifo_bob_to_lucy");
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return 1;
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}
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}
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if (mkfifo("fifo_lucy_to_bob", 0644) != -1)
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{
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if (errno != EEXIST)
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{
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perror("fifo_lucy_to_bob");
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return 1;
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}
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}
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int i = 0;
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for (; i < 2; i++)
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{
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int pid = fork();
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if (pid == 0)
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break;
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}
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if (i == 0)
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{
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// 第一个子进程
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// 从键盘输入数据并发送给对方 (bob -> lucy)
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int fd = open("fifo_bob_to_lucy", O_WRONLY); // 只写消息
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while (1)
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{
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char buf[128] = {};
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int len = read(STDIN_FILENO, buf, 128);
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buf[len - 1] = '\0';
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write(fd, buf, len);
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if (strcmp(buf, "bye") == 0)
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{
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break;
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}
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}
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close(fd);
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_exit(0);
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}
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else if (i == 1)
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{
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// 第二个进程，读数据 (lucy -> bob)
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int fd = open("fifo_lucy_to_bob", O_RDONLY);
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while (1)
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{
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char buf[128] = "";
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int len = read(fd, buf, 128);
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if (len <= 0)
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break;
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printf("接收 Lucy: %s\n", buf);
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}
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close(fd);
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_exit(0);
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}
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else
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{
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// 主进程
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while (1)
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{
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// int status;
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int pid_ = waitpid(0, NULL, WNOHANG);
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if (pid_ == -1)
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{
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// 所有子进程都已经退出
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break;
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}
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}
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}
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return 0;
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}
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