1 /* Copyright (C) 2017-2021 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 <stdlib.h> 19 #include <string.h> 20 #include <errno.h> 21 #include <unistd.h> 22 #include <libc-lock.h> 23 #include "nisdomain.h" 24 25 #define MAXDOMAINNAMELEN 1024 26 27 static char domainname[MAXDOMAINNAMELEN]; 28 __libc_lock_define_initialized(static,domainname_lock)29__libc_lock_define_initialized (static, domainname_lock) 30 31 int 32 __nss_get_default_domain (char **outdomain) 33 { 34 int result = 0; 35 *outdomain = NULL; 36 37 __libc_lock_lock (domainname_lock); 38 39 if (domainname[0] != '\0') 40 { 41 if (getdomainname (domainname, MAXDOMAINNAMELEN) < 0) 42 result = errno; 43 else if (strcmp (domainname, "(none)") == 0) 44 { 45 /* If domainname is not set, some systems will return "(none)" */ 46 domainname[0] = '\0'; 47 result = ENOENT; 48 } 49 else 50 *outdomain = domainname; 51 } 52 else 53 *outdomain = domainname; 54 55 __libc_lock_unlock (domainname_lock); 56 57 return result; 58 } 59