]>
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1 /* Optional code to distinguish library flavours.
2 Copyright (C) 2001-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Jakub Jelinek <jakub@redhat.com>, 2001.
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.
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.
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/>. */
20 #ifndef _DL_LIBRECON_H
21 #define _DL_LIBRECON_H 1
23 static inline void __attribute__ ((unused
, always_inline
))
24 _dl_osversion_init (char *assume_kernel
)
26 unsigned long int i
, j
, osversion
= 0;
27 char *p
= assume_kernel
, *q
;
29 for (i
= 0; i
< 3; i
++, p
= q
+ 1)
31 j
= _dl_strtoul (p
, &q
);
32 if (j
>= 255 || p
== q
|| (i
< 2 && *q
&& *q
!= '.'))
37 osversion
|= j
<< (16 - 8 * i
);
42 GLRO(dl_osversion
) = osversion
;
45 /* Recognizing extra environment variables. */
46 #define EXTRA_LD_ENVVARS_13 \
47 if (memcmp (envline, "ASSUME_KERNEL", 13) == 0) \
49 _dl_osversion_init (&envline[14]); \
53 #define DL_OSVERSION_INIT \
55 char *assume_kernel = getenv ("LD_ASSUME_KERNEL"); \
57 _dl_osversion_init (assume_kernel); \
60 #endif /* dl-librecon.h */