| 1 | /* Copyright (C) 1993-2024 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include <errno.h> |
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| 19 | #include <unistd.h> |
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| 20 | #include <hurd.h> |
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| 21 | #include <hurd/id.h> |
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| 22 | |
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| 23 | /* Get the effective group ID of the calling process. */ |
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| 24 | gid_t |
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| 25 | __getegid (void) |
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| 26 | { |
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| 27 | error_t err; |
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| 28 | gid_t egid; |
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| 29 | |
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| 30 | retry: |
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| 31 | HURD_CRITICAL_BEGIN; |
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| 32 | __mutex_lock (&_hurd_id.lock); |
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| 33 | |
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| 34 | if (err = _hurd_check_ids ()) |
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| 35 | egid = __hurd_fail (err); |
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| 36 | else if (_hurd_id.gen.ngids >= 1) |
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| 37 | egid = _hurd_id.gen.gids[0]; |
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| 38 | else if (_hurd_id.aux.ngids >= 1) |
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| 39 | /* We have no effective gids. Return the real gid. */ |
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| 40 | egid = _hurd_id.aux.gids[0]; |
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| 41 | else |
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| 42 | /* We do not even have a real gid. */ |
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| 43 | egid = __hurd_fail (EGRATUITOUS); |
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| 44 | |
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| 45 | __mutex_unlock (&_hurd_id.lock); |
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| 46 | HURD_CRITICAL_END; |
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| 47 | if (egid == -1 && errno == EINTR) |
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| 48 | /* Got a signal while inside an RPC of the critical section, retry again */ |
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| 49 | goto retry; |
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| 50 | |
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| 51 | return egid; |
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| 52 | } |
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| 53 | |
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| 54 | weak_alias (__getegid, getegid) |
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| 55 | |
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