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1998-03-06 17:04 Ulrich Drepper <drepper@cygnus.com> * libc.map: Add _dl_debug_impcalls, _dl_debug_fd, _dl_sysdep_output, __libc_start_main. * csu/Makefile (routines): Add libc-start. * elf/dl-error.c: Remove declaration of _dl_argv. Include <unitsd.h>. * elf/dl-lookup.c: Likewise. * elf/dl-version.c: Likewise. * sysdeps/i386/dl-machine.h: Likewise. * elf/link.h: Declare _dl_argv, _dl_debug_fd. Declare _dl_sysdep_output. Make _dl_sysdep_fatal, _dl_sysdep_error and _dl_sysdep_message macros which use _dl_sysdep_output. * elf/dl-fini.c: Write out which destructor is called while debugging. * elf/dl-init.c: Likewise for constructor. * elf/dl-load.c: Use _dl_debug_message instead of _dl_sysdep_message. * elf/dl-misc.c: Remove _dl_sysdep_fatal, _dl_sysdep_error and _dl_sysdep_message. Add _dl_sysdep_output. * elf/rtld.c: Recognize LD_DEBUG_OUTPUT. Set _dl_debug_fd if this file can be opened. For LD_DEBUG=libs also set _dl_debug_impcalls. * sysdeps/generic/dl-cache.c: Include unistd.h. * sysdeps/generic/libc-start.c: New file. * sysdeps/i386/elf/start.S: Don't call main directly, call * sysdeps/unix/sysv/linux/libc-start.c: New file. __libc_start_main instead. * elf/Makefile ($(objpfx)ld.so): Add $(load-map-file) as dependency.
113 lines
3.4 KiB
C
113 lines
3.4 KiB
C
/* Support for reading /etc/ld.so.cache files written by Linux ldconfig.
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Copyright (C) 1996, 1997, 1998 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 <link.h>
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#include <unistd.h>
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#include <sys/mman.h>
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/* System-dependent function to read a file's whole contents
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in the most convenient manner available. */
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extern void *_dl_sysdep_read_whole_file (const char *filename,
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size_t *filesize_ptr,
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int mmap_prot);
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#ifndef LD_SO_CACHE
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# define LD_SO_CACHE "/etc/ld.so.cache"
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#endif
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#define CACHEMAGIC "ld.so-1.7.0"
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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
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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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} libs[0];
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};
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/* Look up NAME in ld.so.cache and return the file name stored there,
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or null if none is found. */
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const char *
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_dl_load_cache_lookup (const char *name)
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{
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static struct cache_file *cache;
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static size_t cachesize;
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unsigned int i;
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const char *best;
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/* Print a message if the loading of libs is traced. */
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if (_dl_debug_libs)
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_dl_sysdep_message ("\t search cache=", LD_SO_CACHE, "\n", NULL);
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if (cache == NULL)
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{
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/* Read the contents of the file. */
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void *file = _dl_sysdep_read_whole_file (LD_SO_CACHE, &cachesize,
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PROT_READ);
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if (file && cachesize > sizeof *cache &&
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!memcmp (file, CACHEMAGIC, sizeof CACHEMAGIC - 1))
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/* Looks ok. */
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cache = file;
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else
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{
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if (file)
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__munmap (file, cachesize);
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cache = (void *) -1;
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return NULL;
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}
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}
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if (cache == (void *) -1)
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/* Previously looked for the cache file and didn't find it. */
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return NULL;
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best = NULL;
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for (i = 0; i < cache->nlibs; ++i)
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if ((cache->libs[i].flags == 1 ||
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cache->libs[i].flags == 3) && /* ELF library entry. */
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/* Make sure string table indices are not bogus before using them. */
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cache->libs[i].key < cachesize - sizeof *cache &&
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cache->libs[i].value < cachesize - sizeof *cache &&
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/* Does the name match? */
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! strcmp (name, ((const char *) &cache->libs[cache->nlibs] +
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cache->libs[i].key)))
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{
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if ((best == NULL) || (cache->libs[i].flags == 3))
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{
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best = ((const char *) &cache->libs[cache->nlibs]
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+ cache->libs[i].value);
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if (cache->libs[i].flags == 3)
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/* We've found an exact match for the shared object and no
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general `ELF' release. Stop searching. */
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break;
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}
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}
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/* Print our result if wanted. */
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if (_dl_debug_libs && best != NULL)
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_dl_sysdep_message ("\t trying file=", best, "\n", NULL);
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return best;
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}
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