Library: unistd.h
Prototype: pid_t fork(void);
Syntax: pid_t PID
PID = fork();
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On completion, PID will have one of the following values:
> 0 == the childs process ID.
0 == is returned to the child process.
< 0 == an error occoured. No child created, errno is set to
indicate the problem
example
program.
pipe function.
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