Understand the System Requirements

System requirements shall be well understood The purpose is to design an implementation of bidirectional communication channel between a parent and a child process using system calls piped.

The function takes:

char$[]$ msg: A data structure for communication, for reading and writing between processes.

int mode: Describes the operation mode by a number $0,1,2$ or $3.$

Variable arguments: To possibly expand on that, although not necessarily for further features.

Identify Key Functionalities

Mode Interpretation:

Mode $0$: Read from the child process.

Mode $1$: Write to the child process.

Mode $2$: Read from the parent process.

Mode $3$: Write to the parent process.