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a986484f | 1 | /* Optional code to distinguish library flavours. |
04277e02 | 2 | Copyright (C) 2001-2019 Free Software Foundation, Inc. |
a986484f UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Jakub Jelinek <jakub@redhat.com>, 2001. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
a986484f UD |
10 | |
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
a986484f | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
a986484f UD |
19 | |
20 | #ifndef _DL_LIBRECON_H | |
21 | #define _DL_LIBRECON_H 1 | |
22 | ||
4e71f81e RM |
23 | static inline void __attribute__ ((unused, always_inline)) |
24 | _dl_osversion_init (char *assume_kernel) | |
25 | { | |
26 | unsigned long int i, j, osversion = 0; | |
27 | char *p = assume_kernel, *q; | |
28 | ||
29 | for (i = 0; i < 3; i++, p = q + 1) | |
30 | { | |
37b66c0b | 31 | j = _dl_strtoul (p, &q); |
4e71f81e RM |
32 | if (j >= 255 || p == q || (i < 2 && *q && *q != '.')) |
33 | { | |
34 | osversion = 0; | |
35 | break; | |
36 | } | |
37 | osversion |= j << (16 - 8 * i); | |
38 | if (!*q) | |
39 | break; | |
40 | } | |
41 | if (osversion) | |
afdca0f2 | 42 | GLRO(dl_osversion) = osversion; |
4e71f81e RM |
43 | } |
44 | ||
a986484f | 45 | /* Recognizing extra environment variables. */ |
97fd3a30 | 46 | #define EXTRA_LD_ENVVARS_13 \ |
67c94753 | 47 | if (memcmp (envline, "ASSUME_KERNEL", 13) == 0) \ |
97fd3a30 UD |
48 | { \ |
49 | _dl_osversion_init (&envline[14]); \ | |
50 | break; \ | |
51 | } | |
4e71f81e RM |
52 | |
53 | #define DL_OSVERSION_INIT \ | |
54 | do { \ | |
55 | char *assume_kernel = getenv ("LD_ASSUME_KERNEL"); \ | |
56 | if (assume_kernel) \ | |
57 | _dl_osversion_init (assume_kernel); \ | |
58 | } while (0) | |
a986484f UD |
59 | |
60 | #endif /* dl-librecon.h */ |