bsd/man/man2/setregid.2

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  32 .\"     @(#)setregid.2  8.2 (Berkeley) 4/16/94
  33 .\" $FreeBSD: src/lib/libc/sys/setregid.2,v 1.6.2.4 2001/12/14 18:34:01 ru Exp $
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  35 .Dd April 16, 1994
  36 .Dt SETREGID 2
  37 .Os
  38 .Sh NAME
  39 .Nm setregid
  40 .Nd set real and effective group ID
  41 .Sh LIBRARY
  42 .Lb libc
  43 .Sh SYNOPSIS
  44 .In unistd.h
  45 .Ft int
  46 .Fn setregid "gid_t rgid" "gid_t egid"
  47 .Sh DESCRIPTION
  48 The real and effective group ID's of the current process
  49 are set to the arguments.
  50 Unprivileged users may change the real group
  51 ID to the effective group ID and vice-versa; only the super-user may
  52 make other changes.
  53 .Pp
  54 Supplying a value of -1 for either the real or effective
  55 group ID forces the system to substitute the current
  56 ID in place of the -1 parameter.
  57 .Pp
  58 The
  59 .Fn setregid
  60 function was intended to allow swapping
  61 the real and effective group IDs
  62 in set-group-ID programs to temporarily relinquish the set-group-ID value.
  63 This function did not work correctly;
  64 its purpose is now better served by the use of the
  65 .Fn setegid
  66 function (see
  67 .Xr setuid 2 ) .
  68 .Pp
  69 When setting the real and effective group IDs to the same value,
  70 the standard
  71 .Fn setgid
  72 function is preferred.
  73 .Sh RETURN VALUES
  74 .Rv -std setregid
  75 .Sh ERRORS
  76 .Bl -tag -width Er
  77 .It Bq Er EPERM
  78 The current process is not the super-user and a change
  79 other than changing the effective group-id to the real group-id
  80 was specified.
  81 .El
  82 .Sh SEE ALSO
  83 .Xr getgid 2 ,
  84 .Xr issetugid 2 ,
  85 .Xr setegid 2 ,
  86 .Xr setgid 2 ,
  87 .Xr setuid 2
  88 .Sh HISTORY
  89 The
  90 .Fn setregid
  91 system call appeared in
  92 .Bx 4.2 .