重定向输出和错误到插座分布式shell程序 [英] Redirect stdout and stderr to socket for a distributed shell program

问题描述

我由具有客户机和服务器的分布式外壳程序。客户端发送一个命令请求到服务器和服务器本地执行该命令，并应该输出该命令给客户的结果。我有麻烦搞清楚如何标准输出/标准错误重定向到客户端。我用execvp执行的命令。

I made a distributed shell program that has a client and server. The client sends a command request to the server and the server executes that command locally and is supposed to output the results of that command to the client. I am having trouble figuring out how to redirect stdout/stderr to the client. I use execvp to execute the command.

我想我可能需要使用dup2？但我无法弄清楚如何正确使用它。任何帮助吗？

I think I might have to use dup2? But I can't figure out how to use it properly. Any help?

推荐答案

您只需要使用 dup2（）复制套接字的文件描述符到标准错误和标准输出文件描述符。这是pretty多重定向到管道同样的事情。

You just need to use dup2() to duplicate the socket's file descriptor onto the stderr and stdout file descriptors. It's pretty much the same thing as redirecting to pipes.

cpid = fork();
if (cpid == 0) {
  dup2(sockfd, STDOUT_FILENO);
  dup2(sockfd, STDERR_FILENO);
  execvp(...);
  /*... etc. etc. */

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