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/* Support for reading /etc/ld.so.cache files written by Linux ldconfig.
Copyright (C) 2003-2021 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
#include <ldconfig.h>
#include <assert.h>
/* For now we only support the natural XLEN ABI length on all targets, so the
only bits that need to go into ld.so.cache are the FLEG ABI length. */
#if defined __riscv_float_abi_double
# define _DL_CACHE_DEFAULT_ID (FLAG_RISCV_FLOAT_ABI_DOUBLE | FLAG_ELF_LIBC6)
#else
# define _DL_CACHE_DEFAULT_ID (FLAG_RISCV_FLOAT_ABI_SOFT | FLAG_ELF_LIBC6)
#endif
#define _dl_cache_check_flags(flags) \
((flags) == _DL_CACHE_DEFAULT_ID)
/* If given a path to one of our library directories, adds every library
directory via add_dir (), otherwise just adds the giver directory. On
RISC-V, libraries can be found in paths ending in:
- /lib64/lp64d
- /lib64/lp64
- /lib32/ilp32d
- /lib32/ilp32
- /lib (only ld.so)
so this will add all of those paths.
According to Joseph Myers:
My reasoning for that would be: generic autoconf-configured (etc.)
software may only know about using the lib directory, so you want the
lib directory to be searched regardless of the ABI - but it's also
useful to be able to e.g. list /usr/local/lib in /etc/ld.so.conf for all
architectures and have that automatically imply /usr/local/lib64/lp64d
etc. so that libraries can be found that come from software that does
use the ABI-specific directories. */
#define add_system_dir(dir) \
do \
{ \
static const char* lib_dirs[] = { \
"/lib64/lp64d", \
"/lib64/lp64", \
"/lib32/ilp32d", \
"/lib32/ilp32", \
NULL, \
}; \
const size_t lib_len = sizeof ("/lib") - 1; \
size_t len = strlen (dir); \
char path[len + 10]; \
const char **ptr; \
\
memcpy (path, dir, len + 1); \
\
for (ptr = lib_dirs; *ptr != NULL; ptr++) \
{ \
const char *lib_dir = *ptr; \
size_t dir_len = strlen (lib_dir); \
\
if (len >= dir_len \
&& !memcmp (path + len - dir_len, lib_dir, dir_len)) \
{ \
len -= dir_len - lib_len; \
path[len] = '\0'; \
break; \
} \
} \
add_dir (path); \
if (len >= lib_len \
&& !memcmp (path + len - lib_len, "/lib", lib_len)) \
for (ptr = lib_dirs; *ptr != NULL; ptr++) \
{ \
const char *lib_dir = *ptr; \
size_t dir_len = strlen (lib_dir); \
\
assert (dir_len >= lib_len); \
memcpy (path + len, lib_dir + lib_len, \
dir_len - lib_len + 1); \
add_dir (path); \
} \
} while (0)
#include_next <dl-cache.h>
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