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.\" @(#)getpid.2 6.4 (Berkeley) 3/10/91 33.\" 34.Dd March 10, 1991 35.Dt GETPID 2 36.Os BSD 4 37.Sh NAME 38.Nm getpid , 39.Nm getppid 40.Nd get parent or calling process identification 41.Sh SYNOPSIS 42.Fd #include <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 2 67.Sh STANDARDS 68.Fn Getpid 69and 70.Fn getppid 71conform to IEEE Std 1003.1-1988 72.Pq Dq Tn POSIX . 73