100 lines
3.6 KiB
C
100 lines
3.6 KiB
C
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/* Operating system specific code for generic dynamic loader functions.
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Copyright (C) 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <sys/sysctl.h>
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#ifdef SHARED
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/* This is the function used in the dynamic linker to print the fatal error
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message. */
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static inline void
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__attribute__ ((__noreturn__))
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dl_fatal (const char *str)
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{
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_dl_sysdep_output (2, str, NULL);
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_exit (1);
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}
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#endif
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#define DL_SYSDEP_OSCHECK(FATAL) \
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do { \
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/* Test whether the kernel is new enough. This test is only \
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performed if the library is not compiled to run on all \
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kernels. */ \
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if (__LINUX_KERNEL_VERSION > 0) \
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{ \
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static const int sysctl_args[] = { CTL_KERN, KERN_OSRELEASE }; \
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char buf[64]; \
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size_t reslen = sizeof (buf); \
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unsigned int version; \
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int parts; \
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char *cp; \
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\
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/* Try reading the number using `sysctl' first. */ \
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if (__sysctl ((int *) sysctl_args, \
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sizeof (sysctl_args) / sizeof (sysctl_args[0]), \
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buf, &reslen, NULL, 0) < 0) \
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{ \
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/* This was not successful. Now try reading the /proc \
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filesystem. */ \
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int fd = __open ("/proc/sys/kernel/osrelease", O_RDONLY); \
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if (fd == -1 \
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|| (reslen = __read (fd, buf, sizeof (buf))) <= 0) \
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/* This also didn't work. We give up since we cannot \
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make sure the library can actually work. */ \
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FATAL ("FATAL: cannot determine library version\n"); \
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\
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__close (fd); \
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} \
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buf[MIN (reslen, sizeof (buf) - 1)] = '\0'; \
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\
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/* Now convert it into a number. The string consists of at most \
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three parts. */ \
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version = 0; \
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parts = 0; \
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cp = buf; \
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while ((*cp >= '0') && (*cp <= '9')) \
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{ \
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unsigned int here = *cp++ - '0'; \
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\
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while ((*cp >= '0') && (*cp <= '9')) \
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{ \
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here *= 10; \
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here += *cp++ - '0'; \
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} \
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\
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++parts; \
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version <<= 8; \
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version |= here; \
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\
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if (*cp++ != '.') \
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/* Another part following? */ \
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break; \
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} \
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\
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if (parts < 3) \
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version <<= 8 * (3 - parts); \
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\
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/* Now we can test with the required version. */ \
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if (version < __LINUX_KERNEL_VERSION) \
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/* Not sufficent. */ \
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FATAL ("FATAL: kernel too old\n"); \
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} \
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} while (0)
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