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git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/unix/sysv/linux/dl-osinfo.h
1 /* Operating system specific code for generic dynamic loader functions.
2 Copyright (C) 2000 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
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 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
21 #include <sys/sysctl.h>
22 #include <sys/utsname.h>
23 #include "kernel-features.h"
26 # define MIN(a,b) (((a)<(b))?(a):(b))
29 /* There is no prototype for __sysctl in that file. */
30 extern int __sysctl (int *name
, int nlen
, void *oldval
,
31 size_t *oldlenp
, void *newval
, size_t newlen
);
35 /* This is the function used in the dynamic linker to print the fatal error
38 __attribute__ ((__noreturn__
))
39 dl_fatal (const char *str
)
41 _dl_sysdep_output (2, str
, NULL
);
47 #define DL_SYSDEP_OSCHECK(FATAL) \
49 /* Test whether the kernel is new enough. This test is only \
50 performed if the library is not compiled to run on all \
52 if (__LINUX_KERNEL_VERSION > 0) \
56 unsigned int version; \
61 /* Try the uname syscall */ \
64 /* This was not successful. Now try reading the /proc \
67 int fd = __open ("/proc/sys/kernel/osrelease", O_RDONLY); \
69 || (reslen = __read (fd, bufmem, sizeof (bufmem))) <= 0) \
70 /* This also didn't work. We give up since we cannot \
71 make sure the library can actually work. */ \
72 FATAL ("FATAL: cannot determine library version\n"); \
74 buf[MIN (reslen, (ssize_t) sizeof (bufmem) - 1)] = '\0'; \
79 /* Now convert it into a number. The string consists of at most \
84 while ((*cp >= '0') && (*cp <= '9')) \
86 unsigned int here = *cp++ - '0'; \
88 while ((*cp >= '0') && (*cp <= '9')) \
91 here += *cp++ - '0'; \
99 /* Another part following? */ \
104 version <<= 8 * (3 - parts); \
106 /* Now we can test with the required version. */ \
107 if (version < __LINUX_KERNEL_VERSION) \
108 /* Not sufficent. */ \
109 FATAL ("FATAL: kernel too old\n"); \