1.\" Copyright (c) 1980, 1991 Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" from: @(#)getpid.2 6.4 (Berkeley) 3/10/91 33.\" $Id: getpid.2,v 1.4 1993/11/25 00:39:00 jtc Exp $ 34.\" 35.Dd March 10, 1991 36.Dt GETPID 2 37.Os BSD 4 38.Sh NAME 39.Nm getpid , 40.Nm getppid 41.Nd get parent or calling process identification 42.Sh SYNOPSIS 43.Fd #include <sys/types.h> 44.Fd #include <unistd.h> 45.Ft pid_t 46.Fn getpid void 47.Ft pid_t 48.Fn getppid void 49.Sh DESCRIPTION 50.Fn Getpid 51returns 52the process ID of 53the calling process. 54The ID is guaranteed to be unique and is 55useful for constructing temporary file names. 56.Pp 57.Fn Getppid 58returns the process ID of the parent 59of the calling process. 60.Sh ERRORS 61The 62.Fn getpid 63and 64.Fn getppid 65functions are always successful, and no return value is reserved to 66indicate an error. 67.Sh SEE ALSO 68.Xr gethostid 2 69.Sh STANDARDS 70.Fn Getpid 71and 72.Fn getppid 73conform to 74.St -p1003.1-88 . 75