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1999-11-30  Andreas Jaeger  <aj@suse.de>

	Add ldconfig:
	* elf/Makefile (extra-objs): Added ldconfig-modules.
	(ldconfig-modules): New.
	Added vpath for xstrdup and xmalloc.
	Check for use-ldconfig instead of has-ldconfig.
	($(objpfx)ldconfig): New rule with dependencies.
	(distribute): Add new files.

	* sysdeps/unix/sysv/linux/sparc/readelflib.c: New file,
	developed together with Jakub Jelinek <jakub@redhat.com>.
	* sysdeps/generic/readelflib.c: Likewise.

	* elf/cache.c: New file.
	* elf/ldconfig.c: New file.
	* elf/ldconfig.h: New file.
	* elf/readlib.c: New file.

	* Makefile (install): Remove flag -d in ldconfig call.

	* configure.in: Rename has_ldconfig to use_ldconfig, set it to no
	by default.

	* config.make.in (has-ldconfig): Renamed to use-ldconfig, changed
	comment.
This commit is contained in:
Ulrich Drepper 1999-12-04 08:00:00 +00:00
parent 589328764d
commit 591e1ffbf8
12 changed files with 1516 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
ChangeLog
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@ -1,3 +1,30 @@
1999-11-30 Andreas Jaeger <aj@suse.de>
Add ldconfig:
* elf/Makefile (extra-objs): Added ldconfig-modules.
(ldconfig-modules): New.
Added vpath for xstrdup and xmalloc.
Check for use-ldconfig instead of has-ldconfig.
($(objpfx)ldconfig): New rule with dependencies.
(distribute): Add new files.
* sysdeps/unix/sysv/linux/sparc/readelflib.c: New file,
developed together with Jakub Jelinek <jakub@redhat.com>.
* sysdeps/generic/readelflib.c: Likewise.
* elf/cache.c: New file.
* elf/ldconfig.c: New file.
* elf/ldconfig.h: New file.
* elf/readlib.c: New file.
* Makefile (install): Remove flag -d in ldconfig call.
* configure.in: Rename has_ldconfig to use_ldconfig, set it to no
by default.
* config.make.in (has-ldconfig): Renamed to use-ldconfig, changed
comment.
1999-12-03 Ulrich Drepper <drepper@cygnus.com>
* sysdeps/generic/bits/stropts.h: Update with LiS types and

2
NEWS
View File

@ -20,6 +20,8 @@ Version 2.2
* Functions feenableexcept and fedisableexcept to control the
behaviour of individual exceptions have been added by Andreas Jaeger.
* ldconfig program added by Andreas Jaeger and Jakub Jelinek.
Version 2.1.2

5
config.make.in
View File

@ -15,9 +15,8 @@ sysconfdir = @libc_cv_sysconfdir@
libexecdir = @libexecdir@
rootsbindir = @libc_cv_rootsbindir@
# If ldconfig exists. This will go away as soon as `ldconfig' is available
# in GNU libc.
has-ldconfig = @has_ldconfig@
# Should we use and build ldconfig?
use-ldconfig = @use_ldconfig@
# Maybe the `ldd' script must be rewritten.
ldd-rewrite-script = @ldd_rewrite_script@

3
configure.in
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@ -1168,6 +1168,7 @@ libc_link_dests=
libc_link_sources=
# They also can set these variables.
use_ldconfig=no
ldd_rewrite_script=no
# Iterate over all the sysdep directories we will use, running their
@ -1282,7 +1283,7 @@ AC_SUBST(libc_cv_slibdir)
AC_SUBST(libc_cv_sysconfdir)
AC_SUBST(libc_cv_rootsbindir)
AC_SUBST(has_ldconfig)
AC_SUBST(use_ldconfig)
AC_SUBST(ldd_rewrite_script)
AC_SUBST(gnu_ld) AC_SUBST(gnu_as) AC_SUBST(elf)

14
elf/Makefile
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@ -41,7 +41,8 @@ distribute := $(rtld-routines:=.c) dynamic-link.h do-rel.h dl-machine.h \
dl-librecon.h interp.c sln.c dl-dst.h hp-timing.h \
do-lookup.h sprof.c gen-trusted-dirs.awk \
testobj1.c testobj2.c testobj3.c testobj4.c testobj5.c \
testobj6.c testobj1_1.c failobj.c
testobj6.c testobj1_1.c failobj.c \
ldconfig.h ldconfig.c cache.c readlib.c readelflib.c
include ../Makeconfig
@ -64,10 +65,17 @@ install-bin += sprof
others-static = sln
install-rootsbin = sln
ifeq (yes,$(has-ldconfig))
ifeq (yes,$(use-ldconfig))
others-static += ldconfig
others += ldconfig
install-rootsbin += ldconfig
ldconfig-modules := cache readlib xmalloc xstrdup
extra-objs += $(ldconfig-modules:=.o)
# To find xmalloc.c and xstrdup.c
vpath %.c ../locale/programs
endif
ifeq (yes,$(build-shared))
@ -191,6 +199,8 @@ $(objpfx)ldd: ldd.bash.in $(common-objpfx)soversions.mk \
$(objpfx)sprof: $(libdl)
$(objpfx)ldconfig: $(ldconfig-modules:%=$(objpfx)%.o)
test-modules = $(addprefix $(objpfx),$(addsuffix .so,$(modules-names)))
generated += $(addsuffix .so,$(modules-names))

363
elf/cache.c Normal file
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@ -0,0 +1,363 @@
/* Copyright (C) 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Jaeger <aj@suse.de>, 1999.
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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#define _GNU_SOURCE 1
#include <assert.h>
#include <errno.h>
#include <error.h>
#include <dirent.h>
#include <libintl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "ldconfig.h"
#define CACHEMAGIC "ld.so-1.7.0"
struct cache_entry
{
char *lib;
char *path;
int flags;
struct cache_entry *next;
};
struct file_entry
{
int flags; /* This is 1 for an ELF library. */
unsigned int key, value; /* String table indices. */
};
struct cache_file
{
char magic[sizeof CACHEMAGIC - 1];
unsigned int nlibs;
struct file_entry libs[0];
};
/* List of all cache entries. */
static struct cache_entry *entries;
static const char *flag_descr[] =
{ "libc4", "ELF", "libc5", "libc6"};
/* Print a single entry. */
static void
print_entry (const char *lib, int flag, const char *key)
{
printf ("\t%s (", lib);
switch (flag)
{
case FLAG_LIBC4:
case FLAG_ELF:
case FLAG_ELF_LIBC5:
case FLAG_ELF_LIBC6:
fputs (flag_descr [flag & FLAG_TYPE_MASK], stdout);
break;
default:
fputs ("unknown", stdout);
break;
}
switch (flag & FLAG_REQUIRED_MASK)
{
#ifdef __sparc__
case FLAG_SPARC_LIB64:
fputs (",64bit", stdout);
#endif
case 0:
break;
default:
fprintf (stdout, ",%d", flag & FLAG_REQUIRED_MASK);
break;
}
printf (") => %s\n", key);
}
/* Print the whole cache file. */
void
print_cache (const char *cache_name)
{
size_t cache_size;
struct stat st;
int fd;
unsigned int i;
struct cache_file *cache;
const char *cache_data;
fd = open (cache_name, O_RDONLY);
if (fd < 0)
error (EXIT_FAILURE, errno, _("Can't open cache file %s\n"), cache_name);
if (fstat (fd, &st) < 0
/* No need to map the file if it is empty. */
|| st.st_size == 0)
{
close (fd);
return;
}
cache = mmap (0, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
if (cache == MAP_FAILED)
error (EXIT_FAILURE, errno, _("mmap of cache file failed.\n"));
cache_size = st.st_size;
if (cache_size < sizeof (struct cache_file)
|| memcmp (cache->magic, CACHEMAGIC, sizeof CACHEMAGIC - 1))
return;
/* This is where the strings start. */
cache_data = (const char *) &cache->libs[cache->nlibs];
printf (_("%d libs found in cache `%s'\n"), cache->nlibs, cache_name);
/* Print everything. */
for (i = 0; i < cache->nlibs; i++)
print_entry (cache_data + cache->libs[i].key,
cache->libs[i].flags,
cache_data + cache->libs[i].value);
/* Cleanup. */
munmap (cache, cache_size);
close (fd);
}
/* Initialize cache data structures. */
void
init_cache (void)
{
entries = NULL;
}
/* Helper function which must match the one in the dynamic linker, so that
we rely on the same sort order. */
int
cache_libcmp (const char *p1, const char *p2)
{
while (*p1 != '\0')
{
if (*p1 >= '0' && *p1 <= '9')
{
if (*p2 >= '0' && *p2 <= '9')
{
/* Must compare this numerically. */
int val1;
int val2;
val1 = *p1++ - '0';
val2 = *p2++ - '0';
while (*p1 >= '0' && *p1 <= '9')
val1 = val1 * 10 + *p1++ - '0';
while (*p2 >= '0' && *p2 <= '9')
val2 = val2 * 10 + *p2++ - '0';
if (val1 != val2)
return val1 - val2;
}
else
return 1;
}
else if (*p2 >= '0' && *p2 <= '9')
return -1;
else if (*p1 != *p2)
return *p1 - *p2;
else
{
++p1;
++p2;
}
}
return *p1 - *p2;
}
static
int compare (const struct cache_entry *e1, const struct cache_entry *e2)
{
int res;
/* We need to swap entries here to get the correct sort order. */
res = cache_libcmp (e2->lib, e1->lib);
if (res == 0)
{
if (e1->flags < e2->flags)
return 1;
else if (e1->flags > e2->flags)
return -1;
}
return res;
}
/* Save the contents of the cache. */
void
save_cache (const char *cache_name)
{
struct cache_entry *entry;
int i, fd;
size_t total_strlen, len;
char *strings, *str, *temp_name;
struct cache_file *file_entries;
size_t file_entries_size;
unsigned int str_offset;
/* Number of cache entries. */
int cache_entry_count = 0;
/* The cache entries are sorted already, save them in this order. */
/* Count the length of all strings. */
total_strlen = 0;
for (entry = entries; entry != NULL; entry = entry->next)
{
/* Account the final NULs. */
total_strlen += strlen (entry->lib) + strlen (entry->path) + 2;
++cache_entry_count;
}
/* Create the on disk cache structure. */
/* First an array for all strings. */
strings = (char *)xmalloc (total_strlen + 1);
/* And the list of all entries. */
file_entries_size = sizeof (struct cache_file)
+ cache_entry_count * sizeof (struct file_entry);
file_entries = (struct cache_file *) xmalloc (file_entries_size);
/* Fill in the header. */
memset (file_entries, 0, sizeof (struct cache_file));
memcpy (file_entries->magic, CACHEMAGIC, sizeof CACHEMAGIC - 1);
file_entries->nlibs = cache_entry_count;
str_offset = 0;
str = strings;
for (i = 0, entry = entries; entry != NULL; entry = entry->next, ++i)
{
file_entries->libs[i].flags = entry->flags;
/* First the library. */
/* XXX: Actually we can optimize here and remove duplicates. */
file_entries->libs[i].key = str_offset;
len = strlen (entry->lib);
str = stpcpy (str, entry->lib);
/* Account the final NUL. */
++str;
str_offset += len + 1;
/* Then the path. */
file_entries->libs[i].value = str_offset;
len = strlen (entry->path);
str = stpcpy (str, entry->path);
/* Account the final NUL. */
++str;
str_offset += len + 1;
}
assert (str_offset == total_strlen);
/* Write out the cache. */
/* Write cache first to a temporary file and rename it later. */
temp_name = xmalloc (strlen (cache_name) + 2);
sprintf (temp_name, "%s~", cache_name);
/* First remove an old copy if it exists. */
if (unlink (temp_name) && errno != ENOENT)
error (EXIT_FAILURE, errno, _("Can't remove old temporary cache file %s"),
temp_name);
/* Create file. */
fd = open (temp_name, O_CREAT|O_WRONLY|O_TRUNC|O_NOFOLLOW, 0644);
if (fd < 0)
error (EXIT_FAILURE, errno, _("Can't create temporary cache file %s"),
temp_name);
/* Write contents. */
if (write (fd, file_entries, file_entries_size) != (ssize_t)file_entries_size)
error (EXIT_FAILURE, errno, _("Writing of cache data failed"));
if (write (fd, strings, total_strlen) != (ssize_t)total_strlen)
error (EXIT_FAILURE, errno, _("Writing of cache data failed."));
close (fd);
/* Move temporary to its final location. */
if (rename (temp_name, cache_name))
error (EXIT_FAILURE, errno, _("Renaming of %s to %s failed"), temp_name,
cache_name);
/* Free all allocated memory. */
free (file_entries);
free (strings);
while (entries)
{
entry = entries;
free (entry->path);
free (entry->lib);
entries = entries->next;
free (entry);
}
}
/* Add one library to the cache. */
void
add_to_cache (const char *path, const char *lib, int flags)
{
struct cache_entry *new_entry, *ptr, *prev;
char *full_path;
int len;
new_entry = (struct cache_entry *) xmalloc (sizeof (struct cache_entry));
len = strlen (lib) + strlen (path) + 2;
full_path = (char *) xmalloc (len);
snprintf (full_path, len, "%s/%s", path, lib);
new_entry->lib = xstrdup (lib);
new_entry->path = full_path;
new_entry->flags = flags;
/* Keep the list sorted - search for right place to insert. */
ptr = entries;
prev = entries;
while (ptr != NULL)
{
if (compare (ptr, new_entry) > 0)
break;
prev = ptr;
ptr = ptr->next;
}
/* Is this the first entry? */
if (ptr == entries)
{
new_entry->next = entries;
entries = new_entry;
}
else
{
new_entry->next = prev->next;
prev->next = new_entry;
}
}

647
elf/ldconfig.c Normal file
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@ -0,0 +1,647 @@
/* Copyright (C) 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Jaeger <aj@suse.de>, 1999.
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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <argp.h>
#include <dirent.h>
#include <error.h>
#include <errno.h>
#include <libintl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "ldconfig.h"
#ifndef LD_SO_CACHE
# define LD_SO_CACHE "/etc/ld.so.cache"
#endif
#ifndef LD_SO_CONF
# define LD_SO_CONF "/etc/ld.so.conf"
#endif
/* Get libc version number. */
#include <version.h>
#define PACKAGE _libc_intl_domainname
struct lib_entry
{
int flags;
char *lib;
char *path;
};
static const struct
{
const char *name;
int flag;
} lib_types [] =
{
{"libc4", FLAG_LIBC4},
{"libc5", FLAG_ELF_LIBC5},
{"libc6", FLAG_ELF_LIBC6},
{"glibc2", FLAG_ELF_LIBC6}
};
/* List of directories to handle. */
struct dir_entry
{
char *path;
int flag;
struct dir_entry *next;
};
/* The list is unsorted, contains no duplicates. Entries are added at
the end. */
static struct dir_entry *dir_entries;
/* Flags for different options. */
/* Print Cache. */
static int opt_print_cache = 0;
/* Be verbose. */
int opt_verbose = 0;
/* Build cache. */
static int opt_build_cache = 1;
/* Generate links. */
static int opt_link = 1;
/* Only process directories specified on the command line. */
static int opt_only_cline = 0;
/* Path to root for chroot. */
static char *opt_chroot;
/* Cache file to use. */
static const char *cache_file;
/* Configuration file. */
static const char *config_file;
/* Name and version of program. */
static void print_version (FILE *stream, struct argp_state *state);
void (*argp_program_version_hook) (FILE *, struct argp_state *)
= print_version;
/* Definitions of arguments for argp functions. */
static const struct argp_option options[] =
{
{ "print-cache", 'p', NULL, 0, N_("Print cache"), 0},
{ "verbose", 'v', NULL, 0, N_("Generate verbose messages"), 0},
{ NULL, 'N', NULL, 0, N_("Don't build cache"), 0},
{ NULL, 'X', NULL, 0, N_("Don't generate links"), 0},
{ NULL, 'r', "ROOT", 0, N_("Change to and use ROOT as root directory"), 0},
{ NULL, 'C', "CACHE", 0, N_("Use CACHE as cache file"), 0},
{ NULL, 'f', "CONF", 0, N_("Use CONF as configuration file"), 0},
{ NULL, 'n', NULL, 0, N_("Only process directories specified on the command line. Don't build cache."), 0},
{ NULL, 0, NULL, 0, NULL, 0 }
};
/* Short description of program. */
static const char doc[] = N_("Configure Dynamic Linker Run Time Bindings.");
/* Prototype for option handler. */
static error_t parse_opt (int key, char *arg, struct argp_state *state);
/* Data structure to communicate with argp functions. */
static struct argp argp =
{
options, parse_opt, NULL, doc, NULL, NULL, NULL
};
/* Handle program arguments. */
static error_t
parse_opt (int key, char *arg, struct argp_state *state)
{
switch (key)
{
case 'C':
cache_file = arg;
break;
case 'f':
config_file = arg;
break;
case 'N':
opt_build_cache = 0;
break;
case 'n':
opt_build_cache = 0;
opt_only_cline = 1;
break;
case 'p':
opt_print_cache = 1;
break;
case 'r':
opt_chroot = arg;
break;
case 'v':
opt_verbose = 1;
break;
case 'X':
opt_link = 0;
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
/* Print the version information. */
static void
print_version (FILE *stream, struct argp_state *state)
{
fprintf (stream, "ldconfig (GNU %s) %s\n", PACKAGE, VERSION);
fprintf (stream, gettext ("\
Copyright (C) %s Free Software Foundation, Inc.\n\
This is free software; see the source for copying conditions. There is NO\n\
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\
"), "1999");
fprintf (stream, gettext ("Written by %s.\n"),
"Andreas Jaeger");
}
/* Add one directory to the list of directories to process. */
static void
add_dir (const char *line)
{
char *equal_sign;
struct dir_entry *entry, *ptr, *prev;
unsigned int i;
entry = xmalloc (sizeof (struct dir_entry));
entry->next = NULL;
/* Search for an '=' sign. */
entry->path = xstrdup (line);
equal_sign = strchr (entry->path, '=');
if (equal_sign)
{
*equal_sign = '\0';
++equal_sign;
entry->flag = FLAG_ANY;
for (i = 0; i < sizeof (lib_types) / sizeof (lib_types [0]); ++i)
if (strcmp (equal_sign, lib_types[i].name) == 0)
{
entry->flag = lib_types[i].flag;
break;
}
if (entry->flag == FLAG_ANY)
error (0, 0, _("%s is not a known library type"), equal_sign);
}
else
{
entry->flag = FLAG_ANY;
}
/* Canonify path: for now only remove trailing slashes. */
i = strlen (entry->path) - 1;
while (entry->path[i] == '/' && i > 0)
{
entry->path [i] = '\0';
--i;
}
ptr = dir_entries;
prev = ptr;
while (ptr != NULL)
{
/* Check for duplicates. */
if (strcmp (ptr->path, entry->path) == 0)
{
if (opt_verbose)
error (0, 0, _("Path `%s' given more than once"), entry->path);
/* Use the newer information. */
ptr->flag = entry->flag;
free (entry);
break;
}
prev = ptr;
ptr = ptr->next;
}
/* Is this the first entry? */
if (ptr == NULL && dir_entries == NULL)
dir_entries = entry;
else if (ptr == NULL)
prev->next = entry;
}
/* Create a symbolic link from soname to libname in directory path. */
static void
create_links (const char *path, const char *libname, const char *soname)
{
char full_libname [PATH_MAX], full_soname [PATH_MAX];
struct stat stat_lib, stat_so, lstat_so;
int do_link = 1;
int do_remove = 1;
/* XXX: The logics in this function should be simplified. */
/* Get complete path. */
snprintf (full_libname, sizeof full_libname, "%s/%s", path, libname);
snprintf (full_soname, sizeof full_soname, "%s/%s", path, soname);
/* Does soname already exist and point to the right library? */
if (stat (full_soname, &stat_so) == 0)
{
if (stat (full_libname, &stat_lib))
{
error (0, 0, _("Can't stat %s\n"), full_libname);
return;
}
if (stat_lib.st_dev == stat_so.st_dev
&& stat_lib.st_ino == stat_so.st_ino)
/* Link is already correct. */
do_link = 0;
else if (lstat (full_soname, &lstat_so) == 0
&& !S_ISLNK (lstat_so.st_mode))
{
error (0, 0, _("%s is not a symbolic link\n"), full_soname);
do_link = 0;
do_remove = 0;
}
}
else if (lstat (full_soname, &lstat_so) != 0
|| !S_ISLNK (lstat_so.st_mode))
/* Unless it is a stale symlink, there is no need to remove. */
do_remove = 0;
if (opt_verbose)
printf ("\t%s -> %s", soname, libname);
if (do_link && opt_link)
{
/* Remove old link. */
if (do_remove)
if (unlink (full_soname))
{
error (0, 0, _("Can't unlink %s"), full_soname);
do_link = 0;
}
/* Create symbolic link. */
if (do_link && symlink (libname, full_soname))
{
error (0, 0, _("Can't link %s to %s"), full_soname, libname);
do_link = 0;
}
if (opt_verbose)
{
if (do_link)
fputs (_(" (changed)\n"), stdout);
else
fputs (_(" (SKIPPED)\n"), stdout);
}
}
else if (opt_verbose)
fputs ("\n", stdout);
}
/* Read a whole directory and search for libraries.
The purpose is two-fold:
- search for libraries which will be added to the cache
- create symbolic links to the soname for each library
This has to be done separatly for each directory.
To keep track of which libraries to add to the cache and which
links to create, we save a list of all libraries.
The algorithm is basically:
for all libraries in the directory do
get soname of library
if soname is already in list
if new library is newer, replace entry
otherwise ignore this library
otherwise add library to list
For example, if the two libraries libxy.so.1.1 and libxy.so.1.2
exist and both have the same soname, e.g. libxy.so, a symbolic link
is created from libxy.so.1.2 (the newer one) to libxy.so.
libxy.so.1.2 and libxy.so are added to the cache - but not
libxy.so.1.1. */
/* Information for one library. */
struct dlib_entry
{
char *name;
char *soname;
int flag;
int is_link;
struct dlib_entry *next;
};
static void
search_dir (const struct dir_entry *entry)
{
DIR *dir;
struct dirent *direntry;
char buf [PATH_MAX];
char *soname;
struct dlib_entry *dlibs;
struct dlib_entry *dlib_ptr;
int nchars;
struct stat stat_buf;
int is_link;
dlibs = NULL;
if (opt_verbose)
printf ("%s:\n", entry->path);
dir = opendir (entry->path);
if (dir == NULL)
{
if (opt_verbose)
error (0, errno, _("Can't open directory %s"), entry->path);
return;
}
while ((direntry = readdir (dir)) != NULL)
{
int flag;
#ifdef _DIRENT_HAVE_D_TYPE
/* We only look at links and regular files. */
if (direntry->d_type != DT_UNKNOWN
&& direntry->d_type != DT_LNK
&& direntry->d_type != DT_REG)
continue;
#endif /* _DIRENT_HAVE_D_TYPE */
/* Does this file look like a shared library? The dynamic
linker is also considered as shared library. */
if ((strncmp (direntry->d_name, "lib", 3) != 0
&& strncmp (direntry->d_name, "ld-", 3) != 0)
|| strstr (direntry->d_name, ".so") == NULL)
continue;
nchars = snprintf (buf, sizeof (buf), "%s/%s", entry->path,
direntry->d_name);
/* Check for overflow. */
if (nchars >= (int) sizeof (buf))
{
error (0, 0, _("buffer for snprintf too small for %s/%s--file is ignored\n"),
entry->path, direntry->d_name);
continue;
}
if (lstat (buf, &stat_buf))
{
error (0, errno, _("Can't lstat %s"), buf);
continue;
}
else if (!S_ISREG (stat_buf.st_mode) && !S_ISLNK (stat_buf.st_mode))
continue;
is_link = S_ISLNK (stat_buf.st_mode);
if (process_file (buf, direntry->d_name, &flag, &soname, is_link))
continue;
/* Links will just point to itself. */
if (is_link)
{
free (soname);
soname = xstrdup (direntry->d_name);
}
if (flag == FLAG_ELF
&& (entry->flag == FLAG_ELF_LIBC5
|| entry->flag == FLAG_ELF_LIBC6))
flag = entry->flag;
/* Some sanity checks to print warnings. */
if (opt_verbose)
{
if (flag == FLAG_ELF_LIBC5 && entry->flag != FLAG_ELF_LIBC5
&& entry->flag != FLAG_ANY)
error (0, 0, _("libc5 library %s in wrong directory"), buf);
if (flag == FLAG_ELF_LIBC6 && entry->flag != FLAG_ELF_LIBC6
&& entry->flag != FLAG_ANY)
error (0, 0, _("libc6 library %s in wrong directory"), buf);
if (flag == FLAG_LIBC4 && entry->flag != FLAG_LIBC4
&& entry->flag != FLAG_ANY)
error (0, 0, _("libc4 library %s in wrong directory"), buf);
}
/* Add library to list. */
for (dlib_ptr = dlibs; dlib_ptr != NULL; dlib_ptr = dlib_ptr->next)
{
/* Is soname already in list? */
if (strcmp (dlib_ptr->soname, soname) == 0)
{
/* Prefer a file to a link, otherwise check which one
is newer. */
if ((!is_link && dlib_ptr->is_link)
|| (is_link == dlib_ptr->is_link
&& cache_libcmp (dlib_ptr->name, direntry->d_name) < 0))
{
/* It's newer - add it. */
/* Flag should be the same - sanity check. */
if (dlib_ptr->flag != flag)
{
if (dlib_ptr->flag == FLAG_ELF
&& (flag == FLAG_ELF_LIBC5 || flag == FLAG_ELF_LIBC6))
dlib_ptr->flag = flag;
else if ((dlib_ptr->flag == FLAG_ELF_LIBC5
|| dlib_ptr->flag == FLAG_ELF_LIBC6)
&& flag == FLAG_ELF)
dlib_ptr->flag = flag;
else
error (0, 0, _("libraries %s and %s in directory %s have same soname but different type."),
dlib_ptr->name, direntry->d_name, entry->path);
}
free (dlib_ptr->name);
dlib_ptr->name = xstrdup (direntry->d_name);
dlib_ptr->is_link = is_link;
}
/* Don't add this library, abort loop. */
/* Also free soname, since it's dynamically allocated. */
free (soname);
break;
}
}
/* Add the library if it's not already in. */
if (dlib_ptr == NULL)
{
dlib_ptr = (struct dlib_entry *)xmalloc (sizeof (struct dlib_entry));
dlib_ptr->name = xstrdup (direntry->d_name);
dlib_ptr->flag = flag;
dlib_ptr->soname = soname;
dlib_ptr->is_link = is_link;
/* Add at head of list. */
dlib_ptr->next = dlibs;
dlibs = dlib_ptr;
}
}
closedir (dir);
/* Now dlibs contains a list of all libs - add those to the cache
and created all symbolic links. */
for (dlib_ptr = dlibs; dlib_ptr != NULL; dlib_ptr = dlib_ptr->next)
{
/* Don't create links to links. */
if (dlib_ptr->is_link == 0)
create_links (entry->path, dlib_ptr->name, dlib_ptr->soname);
if (opt_build_cache)
add_to_cache (entry->path, dlib_ptr->soname, dlib_ptr->flag);
}
/* Free all resources. */
while (dlibs)
{
dlib_ptr = dlibs;
free (dlib_ptr->soname);
free (dlib_ptr->name);
dlibs = dlibs->next;
free (dlib_ptr);
}
}
/* Search through all libraries. */
static void
search_dirs (void)
{
struct dir_entry *entry;
for (entry = dir_entries; entry != NULL; entry = entry->next)
search_dir (entry);
/* Free all allocated memory. */
while (dir_entries)
{
entry = dir_entries;
dir_entries = dir_entries->next;
free (entry->path);
free (entry);
}
}
/* Parse configuration file. */
static void
parse_conf (const char *filename)
{
FILE *file;
char *line = NULL;
size_t len = 0;
file = fopen (filename, "r");
if (file == NULL)
{
error (0, errno, _("Can't open configuration file %s"), filename);
return;
}
do
{
ssize_t n = getline (&line, &len, file);
if (n < 0)
break;
if (line[n - 1] == '\n')
line[n - 1] = '\0';
/* Because the file format does not know any form of quoting we
can search forward for the next '#' character and if found
make it terminating the line. */
*strchrnul (line, '#') = '\0';
/* If the line is blank it is ignored. */
if (line[0] == '\0')
continue;
add_dir (line);
} while (!feof (file));
/* Free buffer and close file. */
free (line);
fclose (file);
}
int
main (int argc, char **argv)
{
int remaining;
/* Parse and process arguments. */
argp_parse (&argp, argc, argv, 0, &remaining, NULL);
/* Remaining arguments are additional libraries. */
if (remaining != argc)
{
int i;
for (i = remaining; i < argc; ++i)
add_dir (argv [i]);
}
if (cache_file == NULL)
cache_file = LD_SO_CACHE;
if (config_file == NULL)
config_file = LD_SO_CONF;
/* Chroot first. */
if (opt_chroot)
{
if (chroot (opt_chroot))
/* Report failure and exit program. */
error (EXIT_FAILURE, errno, _("Can't chroot to %s"), opt_chroot);
/* chroot doesn't change the working directory, let's play safe. */
if (chdir ("/"))
error (EXIT_FAILURE, errno, _("Can't chdir to /"));
}
if (opt_print_cache)
{
print_cache (cache_file);
exit (0);
}
if (opt_build_cache)
init_cache ();
if (!opt_only_cline)
{
/* Always add the standard search paths. */
add_dir ("/lib");
add_dir ("/usr/lib");
parse_conf (config_file);
}
search_dirs ();
if (opt_build_cache)
save_cache (cache_file);
return 0;
}

63
elf/ldconfig.h Normal file
View File

@ -0,0 +1,63 @@
/* Copyright (C) 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Jaeger <aj@suse.de>, 1999.
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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef _LDCONFIG_H
#define _LDCONFIG_H
#define FLAG_ANY -1
#define FLAG_TYPE_MASK 0x00ff
#define FLAG_LIBC4 0x0000
#define FLAG_ELF 0x0001
#define FLAG_ELF_LIBC5 0x0002
#define FLAG_ELF_LIBC6 0x0003
#define FLAG_REQUIRED_MASK 0xff00
#define FLAG_SPARC_LIB64 0x0100
/* Declared in cache.c. */
extern void print_cache (const char *cache_name);
extern void init_cache (void);
extern void save_cache (const char *cache_name);
extern void add_to_cache (const char *path, const char *lib, int flags);
extern int cache_libcmp (const char *p1, const char *p2);
/* Declared in readlib.c. */
extern int process_file (const char *file_name, const char *lib, int *flag,
char **soname, int is_link);
/* Declared in readelflib.c. */
extern int process_elf_file (const char *file_name, const char *lib, int *flag,
char **soname, void *file_contents);
/* Declared in ldconfig.c. */
extern int opt_verbose;
/* Prototypes for a few program-wide used functions. */
extern void *xmalloc (size_t __n);
extern void *xcalloc (size_t __n, size_t __size);
extern void *xrealloc (void *__p, size_t __n);
extern char *xstrdup (const char *__str);
#endif /* ! _LDCONFIG_H */

160
elf/readlib.c Normal file
View File

@ -0,0 +1,160 @@
/* Copyright (C) 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Jaeger <aj@suse.de>, 1999 and
Jakub Jelinek <jakub@redhat.com>, 1999.
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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* The code in this file and in readelflib is a heavily simplified
version of the readelf program that's part of the current binutils
development version. Besides the simplification, it has also been
modified to read some other file formats. */
#include <a.out.h>
#include <elf.h>
#include <error.h>
#include <link.h>
#include <libintl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include "ldconfig.h"
#define Elf32_CLASS ELFCLASS32
#define Elf64_CLASS ELFCLASS64
struct known_names
{
const char *soname;
int flag;
};
static struct known_names interpreters [] =
{
{"/lib/ld-linux.so.2", FLAG_ELF_LIBC6},
{"/lib/ld-linux.so.1", FLAG_ELF_LIBC5}
};
static struct known_names known_libs [] =
{
{"libc.so.6", FLAG_ELF_LIBC6},
{"libc.so.5", FLAG_ELF_LIBC5},
{"libm.so.6", FLAG_ELF_LIBC6},
{"libm.so.5", FLAG_ELF_LIBC5}
};
/* Returns 0 if everything is ok, != 0 in case of error. */
int
process_file (const char *file_name, const char *lib, int *flag, char **soname, int is_link)
{
FILE *file;
struct stat statbuf;
void *file_contents;
int ret;
ElfW(Ehdr) *elf_header;
struct exec *aout_header;
ret = 0;
*flag = FLAG_ANY;
*soname = NULL;
file = fopen (file_name, "rb");
if (file == NULL)
{
/* No error for stale symlink. */
if (is_link && strstr (file_name, ".so.") != NULL)
return 1;
error (0, 0, _("Input file %s not found.\n"), file_name);
return 1;
}
if (fstat (fileno (file), &statbuf) < 0)
{
error (0, 0, _("Cannot fstat file %s.\n"), file_name);
return 1;
}
file_contents = mmap (0, statbuf.st_size, PROT_READ, MAP_SHARED, fileno (file), 0);
if (file_contents == MAP_FAILED)
{
error (0, 0, _("Cannot mmap file %s.\n"), file_name);
fclose (file);
return 1;
}
/* First check if this is an aout file. */
aout_header = (struct exec *) file_contents;
if (N_MAGIC (*aout_header) == ZMAGIC
|| N_MAGIC (*aout_header) == QMAGIC)
{
/* Aout files don't have a soname, just return the the name
including the major number. */
char *copy, *major, *dot;
copy = xstrdup (lib);
major = strstr (copy, ".so.");
if (major)
{
dot = strstr (major + 4, ".");
if (dot)
*dot = '\0';
}
*soname = copy;
*flag = FLAG_LIBC4;
goto done;
}
elf_header = (ElfW(Ehdr) *) file_contents;
if (elf_header->e_ident [EI_MAG0] != ELFMAG0
|| elf_header->e_ident [EI_MAG1] != ELFMAG1
|| elf_header->e_ident [EI_MAG2] != ELFMAG2
|| elf_header->e_ident [EI_MAG3] != ELFMAG3)
{
/* The file is neither ELF nor aout. Check if it's a linker script,
like libc.so - otherwise complain. */
int len = statbuf.st_size;
/* Only search the beginning of the file. */
if (len > 512)
len = 512;
if (memmem (file_contents, len, "GROUP", 5) == NULL
&& memmem (file_contents, len, "GNU ld script", 13) == NULL)
error (0, 0, _("%s is not an ELF file - it has the wrong magic bytes at the start.\n"),
file_name);
ret = 1;
goto done;
}
if (process_elf_file (file_name, lib, flag, soname, file_contents))
ret = 1;
done:
/* Clean up allocated memory and resources. */
munmap (file_contents, statbuf.st_size);
fclose (file);
return ret;
}
/* Get architecture specific version of process_elf_file. */
#include "readelflib.c"

2
manual/time.texi
View File

@ -2237,7 +2237,7 @@ the requested time in the @var{requested_time} parameter is rounded up
to the next integer multiple of the actual resolution of the system.
If the function returns because the time has elapsed the return value is
zero. If the function return @math{-1} the global variable @var{errno}
zero. If the function returns @math{-1} the global variable @var{errno}
is set to the following values:
@table @code

180
sysdeps/generic/readelflib.c Normal file
View File

@ -0,0 +1,180 @@
/* Copyright (C) 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Jaeger <aj@suse.de>, 1999 and
Jakub Jelinek <jakub@redhat.com>, 1999.
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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* This code is a heavily simplified version of the readelf program
that's part of the current binutils development version. For architectures
which need to handle both 32bit and 64bit ELF libraries, this file is
included twice for each arch size. */
/* Returns 0 if everything is ok, != 0 in case of error. */
int
process_elf_file (const char *file_name, const char *lib, int *flag, char **soname,
void *file_contents)
{
int i;
unsigned int j;
int loadaddr;
unsigned int dynamic_addr;
size_t dynamic_size;
char *program_interpreter;
ElfW(Ehdr) *elf_header;
ElfW(Phdr) *elf_pheader, *segment;
ElfW(Dyn) *dynamic_segment, *dyn_entry;
char *dynamic_strings;
elf_header = (ElfW(Ehdr) *) file_contents;
if (elf_header->e_ident [EI_CLASS] != ElfW (CLASS))
{
if (opt_verbose)
{
if (ElfW (CLASS) == ELFCLASS32)
error (0, 0, _("%s is a 32 bit ELF file.\n"), file_name);
else if (ElfW (CLASS) == ELFCLASS64)
error (0, 0, _("%s is a 64 bit ELF file.\n"), file_name);
else
error (0, 0, _("Unknown ELFCLASS in file %s.\n"), file_name);
}
return 1;
}
if (elf_header->e_type != ET_DYN)
{
error (0, 0, _("%s is not a shared object file (Type: %d).\n"), file_name,
elf_header->e_type);
return 1;
}
/* Get information from elf program header. */
elf_pheader = (ElfW(Phdr) *) (elf_header->e_phoff + file_contents);
/* The library is an elf library, now search for soname and
libc5/libc6. */
*flag = FLAG_ELF;
loadaddr = -1;
dynamic_addr = 0;
dynamic_size = 0;
program_interpreter = NULL;
for (i = 0, segment = elf_pheader;
i < elf_header->e_phnum; i++, segment++)
{
switch (segment->p_type)
{
case PT_LOAD:
if (loadaddr == -1)
loadaddr = (segment->p_vaddr & 0xfffff000)
- (segment->p_offset & 0xfffff000);
break;
case PT_DYNAMIC:
if (dynamic_addr)
error (0, 0, _("more than one dynamic segment\n"));
dynamic_addr = segment->p_offset;
dynamic_size = segment->p_filesz;
break;
case PT_INTERP:
program_interpreter = (char *) (file_contents + segment->p_offset);
/* Check if this is enough to classify the binary. */
for (j = 0; j < sizeof (interpreters) / sizeof (interpreters [0]);
++j)
if (strcmp (program_interpreter, interpreters[j].soname) == 0)
{
*flag = interpreters[j].flag;
break;
}
break;
default:
break;
}
}
if (loadaddr == -1)
{
/* Very strange. */
loadaddr = 0;
}
/* Now we can read the dynamic sections. */
if (dynamic_size == 0)
return 1;
dynamic_segment = (ElfW(Dyn) *) (file_contents + dynamic_addr);
/* Find the string table. */
dynamic_strings = NULL;
for (dyn_entry = dynamic_segment; dyn_entry->d_tag != DT_NULL;
++dyn_entry)
{
if (dyn_entry->d_tag == DT_STRTAB)
{
dynamic_strings = (char *) (file_contents + dyn_entry->d_un.d_val - loadaddr);
break;
}
}
if (dynamic_strings == NULL)
return 1;
/* Now read the DT_NEEDED and DT_SONAME entries. */
for (dyn_entry = dynamic_segment; dyn_entry->d_tag != DT_NULL;
++dyn_entry)
{
if (dyn_entry->d_tag == DT_NEEDED || dyn_entry->d_tag == DT_SONAME)
{
char *name = dynamic_strings + dyn_entry->d_un.d_val;
if (dyn_entry->d_tag == DT_NEEDED)
{
if (*flag == FLAG_ELF)
{
/* Check if this is enough to classify the binary. */
for (j = 0;
j < sizeof (known_libs) / sizeof (known_libs [0]);
++j)
if (strcmp (name, known_libs [j].soname) == 0)
{
*flag = known_libs [j].flag;
break;
}
}
}
else if (dyn_entry->d_tag == DT_SONAME)
*soname = xstrdup (name);
/* Do we have everything we need? */
if (*soname && *flag != FLAG_ELF)
return 0;
}
}
/* We reach this point only if the file doesn't contain a DT_SONAME
or if we can't classify the library. If it doesn't have a
soname, return the name of the library. */
if (*soname == NULL)
*soname = xstrdup (lib);
return 0;
}

57
sysdeps/unix/sysv/linux/sparc/readelflib.c Normal file
View File

@ -0,0 +1,57 @@
/* Copyright (C) 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Jaeger <aj@suse.de>, 1999 and
Jakub Jelinek <jakub@redhat.com>, 1999.
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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
int process_elf32_file (const char *file_name, const char *lib, int *flag,
char **soname, void *file_contents);
int process_elf64_file (const char *file_name, const char *lib, int *flag,
char **soname, void *file_contents);
/* Returns 0 if everything is ok, != 0 in case of error. */
int
process_elf_file (const char *file_name, const char *lib, int *flag,
char **soname, void *file_contents)
{
ElfW(Ehdr) *elf_header = (ElfW(Ehdr) *) file_contents;
int ret;
if (elf_header->e_ident [EI_CLASS] == ELFCLASS32)
return process_elf32_file (file_name, lib, flag, soname, file_contents);
else
{
ret = process_elf64_file (file_name, lib, flag, soname, file_contents);
/* Sparc 64bit libraries are always libc.so.6+. */
if (!ret)
*flag = FLAG_SPARC_LIB64|FLAG_ELF_LIBC6;
return ret;
}
}
#undef __ELF_NATIVE_CLASS
#undef process_elf_file
#define process_elf_file process_elf32_file
#define __ELF_NATIVE_CLASS 32
#include "sysdeps/generic/readelflib.c"
#undef __ELF_NATIVE_CLASS
#undef process_elf_file
#define process_elf_file process_elf64_file
#define __ELF_NATIVE_CLASS 64
#include "sysdeps/generic/readelflib.c"