bsd/man/man2/getgid.2

   1 .\"     $NetBSD: getgid.2,v 1.5 1995/02/27 12:32:53 cgd Exp $
   2 .\"
   3 .\" Copyright (c) 1983, 1991, 1993
   4 .\"     The Regents of the University of California.  All rights reserved.
   5 .\"
   6 .\" Redistribution and use in source and binary forms, with or without
   7 .\" modification, are permitted provided that the following conditions
   8 .\" are met:
   9 .\" 1. Redistributions of source code must retain the above copyright
  10 .\"    notice, this list of conditions and the following disclaimer.
  11 .\" 2. Redistributions in binary form must reproduce the above copyright
  12 .\"    notice, this list of conditions and the following disclaimer in the
  13 .\"    documentation and/or other materials provided with the distribution.
  14 .\" 3. All advertising materials mentioning features or use of this software
  15 .\"    must display the following acknowledgement:
  16 .\"     This product includes software developed by the University of
  17 .\"     California, Berkeley and its contributors.
  18 .\" 4. Neither the name of the University nor the names of its contributors
  19 .\"    may be used to endorse or promote products derived from this software
  20 .\"    without specific prior written permission.
  21 .\"
  22 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25 .\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32 .\" SUCH DAMAGE.
  33 .\"
  34 .\"     @(#)getgid.2    8.1 (Berkeley) 6/4/93
  35 .\"
  36 .Dd June 4, 1993
  37 .Dt GETGID 2
  38 .Os BSD 4.2
  39 .Sh NAME
  40 .Nm getgid ,
  41 .Nm getegid
  42 .Nd get group process identification
  43 .Sh SYNOPSIS
  44 .Fd #include <sys/types.h>
  45 .Fd #include <unistd.h>
  46 .Ft gid_t
  47 .Fn getgid void
  48 .Ft gid_t
  49 .Fn getegid void
  50 .Sh DESCRIPTION
  51 The
  52 .Fn getgid
  53 function returns the real group ID of the calling process,
  54 .Fn getegid
  55 returns the effective group ID of the calling process.
  56 .Pp
  57 The real group ID is specified at login time.
  58 .Pp
  59 The real group ID is the group of the user who invoked the program.
  60 As the effective group ID gives the process additional permissions
  61 during the execution of
  62 .Dq Em set-group-ID
  63 mode processes,
  64 .Fn getgid
  65 is used to determine the real-user-id of the calling process.
  66 .Sh ERRORS
  67 The
  68 .Fn getgid
  69 and
  70 .Fn getegid
  71 functions are always successful, and no return value is reserved to
  72 indicate an error.
  73 .Sh SEE ALSO
  74 .Xr getuid 2 ,
  75 .Xr setregid 2 ,
  76 .Xr setgid 3
  77 .Sh STANDARDS
  78 .Fn Getgid
  79 and
  80 .Fn getegid
  81 conform to
  82 .St -p1003.1-88 .