在C中重定向子进程的输入和输出

Question

I want to write ac program in which i create multiple child processes and redirect their inputs and outputs to different file descriptors .I googled a lot but couldn't find relevant results. Please help .

Answer 1

Start with dup . You really need to search a bit harder. There is plenty of material on this.

Answer 2

The answer depends on your operating system. On UNIX-like systems, you use dup() and dup2() to copy file descriptors around; each child process will inherit the current set of file descriptors from the parent when it is exec -ed. So typically you fork the child process, set file descriptors 0, 1, and 2 to whatever you want them to be, and then exec() the actual child program.

Answer 3

My favorite is forkpty . This function forks a child and give you a file descriptor to its stdin/stdout. You can use exec after forking,