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c3b287be74
During critical sections, signal handling is deferred and thus RPCs return EINTR, even if SA_RESTART is set. We thus have to restart the whole critical section in that case. This also adds HURD_CRITICAL_UNLOCK in the cases where one wants to break the section in the middle.
61 lines
1.6 KiB
C
61 lines
1.6 KiB
C
/* Copyright (C) 1993-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <unistd.h>
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#include <hurd.h>
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#include <hurd/id.h>
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/* Get the effective group ID of the calling process. */
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gid_t
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__getegid (void)
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{
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error_t err;
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gid_t egid;
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retry:
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HURD_CRITICAL_BEGIN;
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__mutex_lock (&_hurd_id.lock);
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if (err = _hurd_check_ids ())
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{
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errno = err;
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egid = -1;
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}
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else if (_hurd_id.gen.ngids >= 1)
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egid = _hurd_id.gen.gids[0];
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else if (_hurd_id.aux.ngids >= 1)
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/* We have no effective gids. Return the real gid. */
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egid = _hurd_id.aux.gids[0];
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else
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{
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/* We do not even have a real gid. */
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errno = EGRATUITOUS;
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egid = -1;
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}
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__mutex_unlock (&_hurd_id.lock);
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HURD_CRITICAL_END;
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if (egid == -1 && errno == EINTR)
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/* Got a signal while inside an RPC of the critical section, retry again */
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goto retry;
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return egid;
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}
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weak_alias (__getegid, getegid)
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