Communication Between Parent and Child Processes

A call to pipe creates file descriptors, which are valid only within that process and its children.
A process's file descriptors cannot be passed to unrelated processes; however, when the process calls fork, file descriptors are copied to the new child process. Thus, pipes can connect only related processes.
In the following http://siber.cankaya.edu.tr/SystemsProgramming/cfiles/pipe.cprogram, (see Fig. 1.4.1) a fork spawns a child process. The child inherits the pipe file descriptors. The parent writes a string to the pipe, and the child reads it out.

Figure 10: Using a Pipe to Communicate with a Child Process
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**Figure 10:** Using a Pipe to Communicate with a Child Process
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2006-03-31