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/* getresgid -- fetch real group ID, effective group ID, and saved-set group ID
Copyright (C) 2002-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <unistd.h>
#include <hurd.h>
#include <hurd/id.h>
/* Fetch the real group ID, effective group ID, and saved-set group ID,
of the calling process. */
int
__getresgid (gid_t *rgid, gid_t *egid, gid_t *sgid)
{
error_t err;
retry:
HURD_CRITICAL_BEGIN;
__mutex_lock (&_hurd_id.lock);
err = _hurd_check_ids ();
if (!err)
{
if (_hurd_id.aux.ngids < 1)
/* We do not even have a real GID. */
err = EGRATUITOUS;
else
{
gid_t real = _hurd_id.aux.gids[0];
*rgid = real;
*egid = _hurd_id.gen.ngids < 1 ? real : _hurd_id.gen.gids[0];
*sgid = _hurd_id.aux.ngids < 2 ? real : _hurd_id.aux.gids[1];
}
}
__mutex_unlock (&_hurd_id.lock);
HURD_CRITICAL_END;
if (err == EINTR)
/* Got a signal while inside an RPC of the critical section, retry again */
goto retry;
return __hurd_fail (err);
}
libc_hidden_def (__getresgid)
weak_alias (__getresgid, getresgid)
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