C: dup2, pipe and fork not working as expected?

You're always suppose to read from file-descriptor 0 and write to file-descriptor 1 with pipes ... you have this relationship reversed in the parent process. For what you're wanting to-do, you may end up needing two pipes for two-way communication between the parent and child that avoids situations where the parent ends up reading the contents it wrote to the pipe since process scheduling is non-deterministic (i.e. , the child is not guaranteed to read what the parent wrote to the pipe if the parent is also reading from the same pipe since the parent could just end up writing and then reading with no interleaving of the child process to read what the parent wrote).

You need two pipes for this: one for the child process's stdin, and one for its stdout. You cannot reuse the two ends of a pipe as two pipes.

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