1.\" $OpenBSD: getpid.2,v 1.8 2000/10/19 17:34:34 aaron 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. All advertising materials mentioning features or use of this software 16.\" must display the following acknowledgement: 17.\" This product includes software developed by the University of 18.\" California, Berkeley and its contributors. 19.\" 4. Neither the name of the University nor the names of its contributors 20.\" may be used to endorse or promote products derived from this software 21.\" without specific prior written permission. 22.\" 23.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33.\" SUCH DAMAGE. 34.\" 35.\" @(#)getpid.2 8.1 (Berkeley) 6/4/93 36.\" 37.Dd June 4, 1993 38.Dt GETPID 2 39.Os 40.Sh NAME 41.Nm getpid , 42.Nm getppid 43.Nd get parent or calling process identification 44.Sh SYNOPSIS 45.Fd #include <sys/types.h> 46.Fd #include <unistd.h> 47.Ft pid_t 48.Fn getpid void 49.Ft pid_t 50.Fn getppid void 51.Sh DESCRIPTION 52.Fn getpid 53returns the process ID of the calling process. 54Though the ID is guaranteed to be unique, it should 55.Em NOT 56be used for constructing temporary file names; see 57.Xr mkstemp 3 58instead. 59.Pp 60.Fn getppid 61returns the process ID of the parent of the calling process. 62.Sh ERRORS 63The 64.Fn getpid 65and 66.Fn getppid 67functions are always successful, and no return value is reserved to 68indicate an error. 69.Sh SEE ALSO 70.Xr gethostid 3 71.Sh STANDARDS 72.Fn getpid 73and 74.Fn getppid 75conform to 76.St -p1003.1-88 . 77