From 158ff48e348ece17fbda4d9b3c152df2f7cc76d0 Mon Sep 17 00:00:00 2001 From: "Thomas Bushnell, BSG" Date: Wed, 11 Sep 1996 02:48:08 +0000 Subject: *** empty log message *** Tue Sep 10 14:42:39 1996 Thomas Bushnell, n/BSG * elf/dl-cache.c: Rename to ... * sysdeps/generic/dl-cache.c: ... here. * sysdeps/mach/hurd/dl-cache.c: New file. * mach/Makefile (distribute): Add `errsystems.awk'. * hurd/Makefile (distribute): Add `Notes' and `intr-msg.h'. * hurd/hurdintr.awk: Delete file. (Not used in ages.) * hurd/intr-rpc.awk: Likewise. * hurd/invoke-trans.c: Likewise. * sysdeps/mach/hurd/i386/longjmp-ctx.c: Likewise. * sysdeps/mach/hurd/alpha/longjmp-ctx.c: Likewise. * sysdeps/mach/hurd/mips/longjmp-ctx.c: Likewise. * sysdeps/mach/hurd/i386/init-fault.c: Likewise. * sysdeps/mach/hurd/mips/init-fault.c: Likewise. * sysdeps/stub/init-fault.c: Likewise. * sysdeps/stub/longjmp-ctx.c: Likewise. Thu Sep 5 08:58:47 1996 Richard Henderson * sysdeps/alpha/elf/start.S: Make _start global again. --- sysdeps/generic/dl-cache.c | 86 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 86 insertions(+) create mode 100644 sysdeps/generic/dl-cache.c (limited to 'sysdeps/generic/dl-cache.c') diff --git a/sysdeps/generic/dl-cache.c b/sysdeps/generic/dl-cache.c new file mode 100644 index 0000000000..6cd454c7ac --- /dev/null +++ b/sysdeps/generic/dl-cache.c @@ -0,0 +1,86 @@ +/* Support for reading /etc/ld.so.cache files written by Linux ldconfig. +Copyright (C) 1996 Free Software Foundation, Inc. +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include +#include +#include + +/* System-dependent function to read a file's whole contents + in the most convenient manner available. */ +extern void *_dl_sysdep_read_whole_file (const char *filename, + size_t *filesize_ptr, + int mmap_prot); + +#define CACHEMAGIC "ld.so-1.7.0" + +struct cache_file + { + char magic[sizeof CACHEMAGIC - 1]; + unsigned int nlibs; + struct + { + int flags; /* This is 1 for an ELF library. */ + unsigned int key, value; /* String table indices. */ + } libs[0]; + }; + +/* Look up NAME in ld.so.cache and return the file name stored there, + or null if none is found. */ + +const char * +_dl_load_cache_lookup (const char *name) +{ + static struct cache_file *cache; + static size_t cachesize; + unsigned int i; + + if (cache == (void *) -1) + /* Previously looked for the cache file and didn't find it. */ + return NULL; + + if (cache == NULL) + { + /* Read the contents of the file. */ + void *file = _dl_sysdep_read_whole_file ("/etc/ld.so.cache", &cachesize, + PROT_READ); + if (file && cachesize > sizeof *cache && + !memcmp (file, CACHEMAGIC, sizeof CACHEMAGIC - 1)) + /* Looks ok. */ + cache = file; + else + { + if (file) + __munmap (file, cachesize); + cache = (void *) -1; + return NULL; + } + } + + for (i = 0; i < cache->nlibs; ++i) + if (cache->libs[i].flags == 1 && /* ELF library entry. */ + /* Make sure string table indices are not bogus before using them. */ + cache->libs[i].key < cachesize - sizeof *cache && + cache->libs[i].value < cachesize - sizeof *cache && + /* Does the name match? */ + ! strcmp (name, ((const char *) &cache->libs[cache->nlibs] + + cache->libs[i].key))) + return (const char *) &cache->libs[cache->nlibs] + cache->libs[i].value; + + return NULL; +} -- cgit v1.2.3