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1 | /* Optional code to distinguish library flavours. | |
2 | Copyright (C) 2001-2016 Free Software Foundation, Inc. | |
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 | |
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. | |
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 | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
17 | License along with the GNU C Library; if not, see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #ifndef _DL_LIBRECON_H | |
21 | #define _DL_LIBRECON_H 1 | |
22 | ||
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 | { | |
31 | j = __strtoul_internal (p, &q, 0, 0); | |
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) | |
42 | GLRO(dl_osversion) = osversion; | |
43 | } | |
44 | ||
45 | /* Recognizing extra environment variables. */ | |
46 | #define EXTRA_LD_ENVVARS_13 \ | |
47 | if (memcmp (envline, "ASSUME_KERNEL", 13) == 0) \ | |
48 | { \ | |
49 | _dl_osversion_init (&envline[14]); \ | |
50 | break; \ | |
51 | } | |
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) | |
59 | ||
60 | #endif /* dl-librecon.h */ |