1.\" $OpenBSD: getpid.2,v 1.13 2015/09/10 17:55:21 schwarze Exp $ 2.\" $NetBSD: getpid.2,v 1.5 1995/02/27 12:33:12 cgd Exp $ 3.\" 4.\" Copyright (c) 1980, 1991, 1993 5.\" The Regents of the University of California. All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. Neither the name of the University nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" @(#)getpid.2 8.1 (Berkeley) 6/4/93 32.\" 33.Dd $Mdocdate: September 10 2015 $ 34.Dt GETPID 2 35.Os 36.Sh NAME 37.Nm getpid , 38.Nm getppid 39.Nd get parent or calling process identification 40.Sh SYNOPSIS 41.In unistd.h 42.Ft pid_t 43.Fn getpid void 44.Ft pid_t 45.Fn getppid void 46.Sh DESCRIPTION 47.Fn getpid 48returns the process ID of the calling process. 49Though the ID is guaranteed to be unique, it should 50.Em NOT 51be used for constructing temporary file names; see 52.Xr mkstemp 3 53instead. 54.Pp 55.Fn getppid 56returns the process ID of the parent of the calling process. 57.Sh RETURN VALUES 58These functions are always successful, and no return value is 59reserved to indicate an error. 60.Sh SEE ALSO 61.Xr gethostid 3 62.Sh STANDARDS 63.Fn getpid 64and 65.Fn getppid 66conform to 67.St -p1003.1-2008 . 68