1/* Optional code to distinguish library flavours.
2 Copyright (C) 2001-2022 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#ifndef _DL_LIBRECON_H
20#define _DL_LIBRECON_H 1
21
22static inline void __attribute__ ((unused, always_inline))
23_dl_osversion_init (char *assume_kernel)
24{
25 unsigned long int i, j, osversion = 0;
26 char *p = assume_kernel, *q;
27
28 for (i = 0; i < 3; i++, p = q + 1)
29 {
30 j = _dl_strtoul (p, &q);
31 if (j >= 255 || p == q || (i < 2 && *q && *q != '.'))
32 {
33 osversion = 0;
34 break;
35 }
36 osversion |= j << (16 - 8 * i);
37 if (!*q)
38 break;
39 }
40 if (osversion)
41 GLRO(dl_osversion) = osversion;
42}
43
44/* Recognizing extra environment variables. */
45#define EXTRA_LD_ENVVARS_13 \
46 if (memcmp (envline, "ASSUME_KERNEL", 13) == 0) \
47 { \
48 _dl_osversion_init (&envline[14]); \
49 break; \
50 }
51
52#define DL_OSVERSION_INIT \
53 do { \
54 char *assume_kernel = getenv ("LD_ASSUME_KERNEL"); \
55 if (assume_kernel) \
56 _dl_osversion_init (assume_kernel); \
57 } while (0)
58
59#endif /* dl-librecon.h */
60