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RedHat 9 (Linux i386) - man page for getpid (redhat section 2)

GETPID(2)						     Linux Programmer's Manual							 GETPID(2)

NAME
getpid, getppid - get process identification
SYNOPSIS
#include <sys/types.h> #include <unistd.h> pid_t getpid(void); pid_t getppid(void);
DESCRIPTION
getpid returns the process ID of the current process. (This is often used by routines that generate unique temporary file names.) getppid returns the process ID of the parent of the current process.
CONFORMING TO
POSIX, BSD 4.3, SVID
SEE ALSO
exec(3), fork(2), kill(2), mkstemp(3), tmpnam(3), tempnam(3), tmpfile(3) Linux 0.99.11 1993-07-23 GETPID(2)