GETPID(2) — System Interface Manual — System Calls
NAME
getpid − get process identification
SYNOPSIS
pid = getpid()
long pid;
DESCRIPTION
Getpid returns the process ID of the current process. Most often it is used with the host identifier gethostid(2) to generate uniquely-named temporary files.
SEE ALSO
Sun System Release 0.3 — 25 April 1983