Usage
The system call takes no arguments. If it returns a negative value, the creation of a child process was unsuccessful. Otherwise, in the child process, the return value of fork is zero, whereas the return value in the parent process is the process identifier of the newly created child process (a positive value). Since both processes continue executing the same program, they typically distinguish the parent from the child by testing the return value of fork.
Read more about this topic: Fork (operating System)
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