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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.
73 lines
2.0 KiB
C
73 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 <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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geteuids (int n, uid_t *uidset)
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{
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error_t err;
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int nuids;
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void *crit;
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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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nuids = _hurd_id.gen.nuids;
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if (n != 0)
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{
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/* Copy the uids onto stack storage and then release the idlock. */
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uid_t uids[nuids];
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memcpy (uids, _hurd_id.gen.uids, sizeof (uids));
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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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uid set into the user's array, which might fault. */
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if (nuids > n)
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nuids = n;
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memcpy (uidset, uids, nuids * sizeof (uid_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 nuids;
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}
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/* XXX Remove this alias when we bump the libc soname. */
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#ifdef SHARED
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weak_alias (geteuids, __getuids)
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#endif
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