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9ec31e5727
The __hurd_fail () inline function is the dedicated, idiomatic way of
reporting errors in the Hurd part of glibc. Not only is it more concise
than '{ errno = err; return -1; }', it is since commit
6639cc1002
"hurd: Mark error functions as __COLD" marked with the cold attribute,
telling the compiler that this codepath is unlikely to be executed.
In one case, use __hurd_dfail () over the plain __hurd_fail ().
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-Id: <20230520115531.3911877-1-bugaevc@gmail.com>
52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
/* Copyright (C) 1993-2023 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 real user ID of the calling process. */
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uid_t
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__getuid (void)
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{
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error_t err;
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uid_t uid;
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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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uid = __hurd_fail (err);
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else if (_hurd_id.aux.nuids >= 1)
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uid = _hurd_id.aux.uids[0];
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else
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/* We do not even have a real uid. */
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uid = __hurd_fail (EGRATUITOUS);
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__mutex_unlock (&_hurd_id.lock);
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HURD_CRITICAL_END;
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if (uid == -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 uid;
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}
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weak_alias (__getuid, getuid)
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