1.\" $NetBSD: getpid.2,v 1.17 2010/04/03 15:13:43 jruoho Exp $ 2.\" 3.\" Copyright (c) 1980, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" @(#)getpid.2 8.1 (Berkeley) 6/4/93 31.\" 32.Dd April 3, 2010 33.Dt GETPID 2 34.Os 35.Sh NAME 36.Nm getpid , 37.Nm getppid 38.Nd get parent or calling process identification 39.Sh LIBRARY 40.Lb libc 41.Sh SYNOPSIS 42.In unistd.h 43.Ft pid_t 44.Fn getpid void 45.Ft pid_t 46.Fn getppid void 47.Sh DESCRIPTION 48.Fn getpid 49returns 50the process ID of 51the calling process. 52The ID is guaranteed to be unique and is 53useful for constructing temporary file names. 54.Pp 55.Fn getppid 56returns the process ID of the parent 57of the calling process. 58.Sh ERRORS 59The 60.Fn getpid 61and 62.Fn getppid 63functions are always successful, and no return value is reserved to 64indicate an error. 65.Sh SEE ALSO 66.Xr gethostid 3 67.Sh STANDARDS 68.Fn getpid 69and 70.Fn getppid 71conform to 72.St -p1003.1-90 . 73.Sh HISTORY 74The 75.Fn getpid 76function appeared in 77.At v5 . 78