Pipes between child processes in C

Question

I\'ve seen this question before, but still a bit confused: how would I create communication between child processes of the same parent? All I\'m trying to do at the moment i

Answer 1

The code to setup a pipe and have stadin/stdout redirected to the pipe is.

In parent (before fork)

   int p[2];
   pipe(p);

In the child (after fork) to get the pipe as stdin

   close(0);
   dup(p[0]);

In the child (after fork) to get the pipe as stdout

  close(1);
  dup(p[1]);

You can start writing to the pipe as soon as it is created. However this child process which is writing to the pipe will pause as soon as the pipe-buffer is filled and until the other process is starting reading from the pipe.

Also look at the popen call as that may actually be a simpler version of what you need.