92 lines
2.6 KiB
Groff
92 lines
2.6 KiB
Groff
.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)getpid.2 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd November 2, 2006
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.Dt GETPID 2
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.Os
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.Sh NAME
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.Nm getpid ,
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.Nm getppid
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.Nd get parent or calling process identification
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/types.h
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.In unistd.h
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.Ft pid_t
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.Fn getpid void
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.Ft pid_t
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.Fn getppid void
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.Sh DESCRIPTION
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The
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.Fn getpid
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system call
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returns
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the process ID of
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the calling process.
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Though the ID is guaranteed to be unique, it should
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.Em NOT
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be used for constructing temporary file names, for
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security reasons; see
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.Xr mkstemp 3
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instead.
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.Pp
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The
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.Fn getppid
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system call
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returns the process ID of the parent
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of the calling process.
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.Sh ERRORS
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The
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.Fn getpid
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and
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.Fn getppid
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system calls are always successful, and no return value is reserved to
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indicate an error.
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.Sh SEE ALSO
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.Xr fork 2 ,
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.Xr getpgrp 2 ,
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.Xr kill 2 ,
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.Xr setpgid 2 ,
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.Xr setsid 2 ,
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.Xr exec 3
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.Sh STANDARDS
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The
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.Fn getpid
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and
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.Fn getppid
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system calls are expected to conform to
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.St -p1003.1-90 .
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.Sh HISTORY
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The
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.Fn getpid
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function appeared in
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.At v7 .
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