1 /* Copyright (C) 1993-2022 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, see 16 <https://www.gnu.org/licenses/>. */ 17 18 #include <errno.h> 19 #include <unistd.h> 20 #include <hurd.h> 21 #include <hurd/id.h> 22 23 /* Get the effective user ID of the calling process. */ 24 uid_t __geteuid(void)25__geteuid (void) 26 { 27 error_t err; 28 uid_t euid; 29 30 retry: 31 HURD_CRITICAL_BEGIN; 32 __mutex_lock (&_hurd_id.lock); 33 34 if (err = _hurd_check_ids ()) 35 { 36 errno = err; 37 euid = -1; 38 } 39 else if (_hurd_id.gen.nuids >= 1) 40 euid = _hurd_id.gen.uids[0]; 41 else if (_hurd_id.aux.nuids >= 1) 42 /* We have no effective uids. Return the real uid. */ 43 euid = _hurd_id.aux.uids[0]; 44 else 45 { 46 /* We do not even have a real uid. */ 47 errno = EGRATUITOUS; 48 euid = -1; 49 } 50 51 __mutex_unlock (&_hurd_id.lock); 52 HURD_CRITICAL_END; 53 if (euid == -1 && errno == EINTR) 54 /* Got a signal while inside an RPC of the critical section, retry again */ 55 goto retry; 56 57 return euid; 58 } 59 60 weak_alias (__geteuid, geteuid) 61