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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.
74 lines
2.0 KiB
C
74 lines
2.0 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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#include <string.h>
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int
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__getgroups (int n, gid_t *gidset)
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{
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error_t err;
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int ngids;
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void *crit;
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if (n < 0)
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return __hurd_fail (EINVAL);
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retry:
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crit = _hurd_critical_section_lock ();
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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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__mutex_unlock (&_hurd_id.lock);
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_hurd_critical_section_unlock (crit);
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if (err == 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 __hurd_fail (err);
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}
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ngids = _hurd_id.gen.ngids;
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if (n != 0)
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{
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/* Copy the gids onto stack storage and then release the idlock. */
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gid_t gids[ngids];
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memcpy (gids, _hurd_id.gen.gids, sizeof (gids));
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__mutex_unlock (&_hurd_id.lock);
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_hurd_critical_section_unlock (crit);
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/* Now that the lock is released, we can safely copy the
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group set into the user's array, which might fault. */
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if (ngids > n)
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return __hurd_fail (EINVAL);
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memcpy (gidset, gids, ngids * sizeof (gid_t));
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}
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else
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{
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__mutex_unlock (&_hurd_id.lock);
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_hurd_critical_section_unlock (crit);
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}
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return ngids;
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}
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weak_alias (__getgroups, getgroups)
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