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. 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.\" @(#)getpid.2 8.1 (Berkeley) 6/4/93 33.\" $FreeBSD: src/lib/libc/sys/getpid.2,v 1.8.2.5 2001/12/14 18:34:00 ru Exp $ 34.\" $DragonFly: src/lib/libc/sys/getpid.2,v 1.3 2007/12/08 23:20:29 swildner Exp $ 35.\" 36.Dd June 4, 1993 37.Dt GETPID 2 38.Os 39.Sh NAME 40.Nm getpid , 41.Nm getppid 42.Nd get parent or calling process identification 43.Sh LIBRARY 44.Lb libc 45.Sh SYNOPSIS 46.In sys/types.h 47.In unistd.h 48.Ft pid_t 49.Fn getpid void 50.Ft pid_t 51.Fn getppid void 52.Sh DESCRIPTION 53.Fn Getpid 54returns 55the process ID of 56the calling process. 57Though the ID is guaranteed to be unique, it should 58.Em NOT 59be used for constructing temporary file names, for 60security reasons; see 61.Xr mkstemp 3 62instead. 63.Pp 64.Fn Getppid 65returns the process ID of the parent 66of the calling process. 67.Sh ERRORS 68The 69.Fn getpid 70and 71.Fn getppid 72functions are always successful, and no return value is reserved to 73indicate an error. 74.Sh SEE ALSO 75.Xr lwp_gettid 2 , 76.Xr gethostid 3 77.Sh STANDARDS 78The 79.Fn getpid 80and 81.Fn getppid 82function calls are expected to conform to 83.St -p1003.1-90 . 84.Sh HISTORY 85A 86.Fn getpid 87function call appeared in 88.At v7 . 89