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download PDF document: getpid.2.pdf

GETPID(2) FreeBSD System Calls Manual GETPID(2)
NAME getpid, getppid - get parent or calling process identification
LIBRARY Standard C Library (libc, -lc)
SYNOPSIS #include <unistd.h>
pid_t getpid(void);
pid_t getppid(void);
DESCRIPTION The getpid() system call returns the process ID of the calling process. Though the ID is guaranteed to be unique, it should NOT be used for constructing temporary file names, for security reasons; see mkstemp(3) instead.
The getppid() system call returns the process ID of the parent of the calling process.
ERRORS The getpid() and getppid() system calls are always successful, and no return value is reserved to indicate an error.
SEE ALSO fork(2), getpgrp(2), kill(2), setpgid(2), setsid(2), exec(3)
STANDARDS The getpid() and getppid() system calls are expected to conform to IEEE Std 1003.1-1990 ("POSIX.1").
HISTORY The getpid() function appeared in Version 7 AT&T UNIX.
FreeBSD 14.0-RELEASE-p11 December 15, 2015 FreeBSD 14.0-RELEASE-p11