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141 lines
3.6 KiB
C
141 lines
3.6 KiB
C
/* Support for reading /etc/ld.so.cache files written by Linux ldconfig.
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Copyright (C) 1999, 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 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 <stdint.h>
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#ifndef _DL_CACHE_DEFAULT_ID
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# define _DL_CACHE_DEFAULT_ID 3
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#endif
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#ifndef _dl_cache_check_flags
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# define _dl_cache_check_flags(flags) \
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((flags) == 1 || (flags) == _DL_CACHE_DEFAULT_ID)
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#endif
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#ifndef SYSCONFDIR
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# define SYSCONFDIR "/etc"
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#endif
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#ifndef LD_SO_CACHE
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# define LD_SO_CACHE SYSCONFDIR "/ld.so.cache"
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#endif
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#define CACHEMAGIC "ld.so-1.7.0"
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/* libc5 and glibc 2.0/2.1 use the same format. For glibc 2.2 another
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format has been added in a compatible way:
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The beginning of the string table is used for the new table:
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old_magic
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nlibs
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libs[0]
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...
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libs[nlibs-1]
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pad, new magic needs to be aligned
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- this is string[0] for the old format
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new magic - this is string[0] for the new format
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newnlibs
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...
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newlibs[0]
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...
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newlibs[newnlibs-1]
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string 1
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string 2
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...
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*/
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struct file_entry
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{
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int flags; /* This is 1 for an ELF library. */
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unsigned int key, value; /* String table indices. */
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};
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struct cache_file
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{
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char magic[sizeof CACHEMAGIC - 1];
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unsigned int nlibs;
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struct file_entry libs[0];
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};
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#define CACHEMAGIC_NEW "glibc-ld.so.cache"
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#define CACHE_VERSION "1.1"
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#define CACHEMAGIC_VERSION_NEW CACHEMAGIC_NEW CACHE_VERSION
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struct file_entry_new
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{
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int32_t flags; /* This is 1 for an ELF library. */
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uint32_t key, value; /* String table indices. */
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uint32_t osversion; /* Required OS version. */
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uint64_t hwcap; /* Hwcap entry. */
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};
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struct cache_file_new
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{
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char magic[sizeof CACHEMAGIC_NEW - 1];
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char version[sizeof CACHE_VERSION - 1];
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uint32_t nlibs; /* Number of entries. */
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uint32_t len_strings; /* Size of string table. */
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uint32_t unused[5]; /* Leave space for future extensions
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and align to 8 byte boundary. */
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struct file_entry_new libs[0]; /* Entries describing libraries. */
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/* After this the string table of size len_strings is found. */
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};
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/* Used to align cache_file_new. */
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#define ALIGN_CACHE(addr) \
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(((addr) + __alignof__ (struct cache_file_new) -1) \
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& (~(__alignof__ (struct cache_file_new) - 1)))
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static int
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_dl_cache_libcmp (const char *p1, const char *p2)
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{
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while (*p1 != '\0')
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{
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if (*p1 >= '0' && *p1 <= '9')
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{
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if (*p2 >= '0' && *p2 <= '9')
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{
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/* Must compare this numerically. */
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int val1;
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int val2;
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val1 = *p1++ - '0';
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val2 = *p2++ - '0';
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while (*p1 >= '0' && *p1 <= '9')
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val1 = val1 * 10 + *p1++ - '0';
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while (*p2 >= '0' && *p2 <= '9')
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val2 = val2 * 10 + *p2++ - '0';
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if (val1 != val2)
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return val1 - val2;
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}
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else
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return 1;
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}
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else if (*p2 >= '0' && *p2 <= '9')
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return -1;
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else if (*p1 != *p2)
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return *p1 - *p2;
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else
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{
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++p1;
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++p2;
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}
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}
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return *p1 - *p2;
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}
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