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NAME
fork - create a child process
SYNOPSIS
#include <unistd.h>
pid_t fork(void);
DESCRIPTION
fork() creates a new process by duplicating the calling process. The
new process is referred to as the child process. The calling process
is referred to as the parent process.
The child process and the parent process run in separate memory spa‐
ces. At the time of fork() both memory spaces have the same content.
Memory writes, file mappings (mmap(2)), and unmappings (munmap(2))
performed by one of the processes do not affect the other.
RETURN VALUE
On success, the PID of the child process is returned in the parent,
and 0 is returned in the child. On failure, -1 is returned in the
parent, no child process is created, and errno is set appropriately.