81 lines
2.6 KiB
Groff
81 lines
2.6 KiB
Groff
.\" Copyright (c) 1983, 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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.\" @(#)getgid.2 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd December 15, 2015
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.Dt GETGID 2
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.Os
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.Sh NAME
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.Nm getgid ,
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.Nm getegid
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.Nd get group 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 unistd.h
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.Ft gid_t
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.Fn getgid void
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.Ft gid_t
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.Fn getegid void
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.Sh DESCRIPTION
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The
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.Fn getgid
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system call returns the real group ID of the calling process,
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.Fn getegid
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returns the effective group ID of the calling process.
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.Pp
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The real group ID is specified at login time.
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.Pp
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The real group ID is the group of the user who invoked the program.
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As the effective group ID gives the process additional permissions
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during the execution of
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.Dq Em set-group-ID
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mode processes,
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.Fn getgid
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is used to determine the real-user-id of the calling process.
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.Sh ERRORS
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The
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.Fn getgid
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and
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.Fn getegid
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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 getuid 2 ,
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.Xr issetugid 2 ,
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.Xr setgid 2 ,
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.Xr setregid 2
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.Sh STANDARDS
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The
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.Fn getgid
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and
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.Fn getegid
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system calls are expected to conform to
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.St -p1003.1-90 .
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