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119 lines
3.4 KiB
C
119 lines
3.4 KiB
C
/* Operating system specific code for generic dynamic loader functions. Linux.
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Copyright (C) 2000,2001,2002,2004,2005 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <string.h>
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#include <fcntl.h>
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#include <sys/sysctl.h>
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#include <sys/utsname.h>
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#include "kernel-features.h"
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#include <dl-sysdep.h>
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#ifndef MIN
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# define MIN(a,b) (((a)<(b))?(a):(b))
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#endif
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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_dprintf (2, str);
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_exit (1);
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}
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#endif
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static inline int __attribute__ ((always_inline))
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_dl_discover_osversion (void)
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{
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char bufmem[64];
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char *buf = bufmem;
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unsigned int version;
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int parts;
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char *cp;
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struct utsname uts;
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/* Try the uname system call. */
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if (__uname (&uts))
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{
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/* This was not successful. Now try reading the /proc filesystem. */
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int fd = __open ("/proc/sys/kernel/osrelease", O_RDONLY);
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if (fd < 0)
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return -1;
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ssize_t reslen = __read (fd, bufmem, sizeof (bufmem));
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__close (fd);
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if (reslen <= 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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return -1;
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buf[MIN (reslen, (ssize_t) sizeof (bufmem) - 1)] = '\0';
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}
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else
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buf = uts.release;
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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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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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++parts;
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version <<= 8;
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version |= here;
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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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if (parts < 3)
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version <<= 8 * (3 - parts);
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return version;
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}
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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 performed \
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if the library is not compiled to run on all kernels. */ \
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\
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int version = _dl_discover_osversion (); \
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if (__builtin_expect (version >= 0, 1)) \
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{ \
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GLRO(dl_osversion) = version; \
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\
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/* Now we can test with the required version. */ \
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if (__LINUX_KERNEL_VERSION > 0 && 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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else if (__LINUX_KERNEL_VERSION > 0) \
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FATAL ("FATAL: cannot determine kernel version\n"); \
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} while (0)
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