1.\" Copyright (c) 1980, 1991, 1993 2.\" The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)getpid.2 8.1 (Berkeley) 6/4/93 29.\" $FreeBSD: src/lib/libc/sys/getpid.2,v 1.8.2.5 2001/12/14 18:34:00 ru Exp $ 30.\" $DragonFly: src/lib/libc/sys/getpid.2,v 1.3 2007/12/08 23:20:29 swildner Exp $ 31.\" 32.Dd June 4, 1993 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 sys/types.h 43.In unistd.h 44.Ft pid_t 45.Fn getpid void 46.Ft pid_t 47.Fn getppid void 48.Sh DESCRIPTION 49.Fn Getpid 50returns 51the process ID of 52the calling process. 53Though the ID is guaranteed to be unique, it should 54.Em NOT 55be used for constructing temporary file names, for 56security reasons; see 57.Xr mkstemp 3 58instead. 59.Pp 60.Fn Getppid 61returns the process ID of the parent 62of the calling process. 63.Sh ERRORS 64The 65.Fn getpid 66and 67.Fn getppid 68functions are always successful, and no return value is reserved to 69indicate an error. 70.Sh SEE ALSO 71.Xr lwp_gettid 2 , 72.Xr gethostid 3 73.Sh STANDARDS 74The 75.Fn getpid 76and 77.Fn getppid 78function calls are expected to conform to 79.St -p1003.1-90 . 80.Sh HISTORY 81A 82.Fn getpid 83function call appeared in 84.At v7 . 85