| 1 | /* Optional code to distinguish library flavours. |
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| 2 | Copyright (C) 2001-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #ifndef _DL_LIBRECON_H |
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| 20 | #define _DL_LIBRECON_H 1 |
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| 21 | |
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| 22 | static inline void __attribute__ ((unused, always_inline)) |
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| 23 | _dl_osversion_init (char *assume_kernel) |
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| 24 | { |
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| 25 | unsigned long int i, j, osversion = 0; |
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| 26 | char *p = assume_kernel, *q; |
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| 27 | |
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| 28 | for (i = 0; i < 3; i++, p = q + 1) |
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| 29 | { |
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| 30 | j = _dl_strtoul (p, &q); |
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| 31 | if (j >= 255 || p == q || (i < 2 && *q && *q != '.')) |
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| 32 | { |
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| 33 | osversion = 0; |
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| 34 | break; |
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| 35 | } |
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| 36 | osversion |= j << (16 - 8 * i); |
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| 37 | if (!*q) |
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| 38 | break; |
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| 39 | } |
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| 40 | if (osversion) |
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| 41 | GLRO(dl_osversion) = osversion; |
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| 42 | } |
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| 43 | |
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| 44 | /* Recognizing extra environment variables. */ |
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| 45 | #define \ |
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| 46 | if (memcmp (envline, "ASSUME_KERNEL", 13) == 0) \ |
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| 47 | { \ |
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| 48 | _dl_osversion_init (&envline[14]); \ |
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| 49 | break; \ |
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| 50 | } |
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| 51 | |
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| 52 | #define DL_OSVERSION_INIT \ |
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| 53 | do { \ |
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| 54 | char *assume_kernel = getenv ("LD_ASSUME_KERNEL"); \ |
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| 55 | if (assume_kernel) \ |
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| 56 | _dl_osversion_init (assume_kernel); \ |
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| 57 | } while (0) |
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| 58 | |
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| 59 | #endif /* dl-librecon.h */ |
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| 60 | |
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