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BSD 2.11 - man page for getpid (bsd section 2)

GETPID(2)							System Calls Manual							 GETPID(2)

NAME
getpid, getppid - get process identification
SYNOPSIS
pid = getpid() int pid; ppid = getppid() int ppid;
DESCRIPTION
Getpid returns the process ID of the current process. Most often it is used to generate uniquely-named temporary files. Getppid returns the process ID of the parent of the current process.
SEE ALSO
gethostid(2) 4th Berkeley Distribution May 13, 1986 GETPID(2)