1 /* __errno_location -- helper function for locating per-thread errno value
2 Copyright (C) 2002-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #if IS_IN (rtld)
20 /* rtld can not access TLS too early, thus rtld_errno.
21
22 Instead of making __open/__close pass errno from TLS to rtld_errno, simply
23 use a weak __errno_location using rtld_errno, which will be overriden by the
24 libc definition. */
25 static int rtld_errno;
26 int * weak_function
__errno_location(void)27 __errno_location (void)
28 {
29 return &rtld_errno;
30 }
31 libc_hidden_weak (__errno_location)
32 #else
33 #include "../../../csu/errno-loc.c"
34 #endif
35