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elf: Add library search path information to ld.so --help

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Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer 2020-10-09 10:13:14 +02:00
parent c5db00dc30
commit 10b39a5124
1 changed files with 56 additions and 0 deletions
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56
elf/dl-usage.c
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@ -46,6 +46,61 @@ PARTICULAR PURPOSE.\n\
_exit (EXIT_SUCCESS);
}
/* Print part of the library search path (from a single source). */
static void
print_search_path_for_help_1 (struct r_search_path_elem **list)
{
if (list == NULL || list == (void *) -1)
/* Path is missing or marked as inactive. */
return;
for (; *list != NULL; ++list)
{
_dl_write (STDOUT_FILENO, " ", 2);
const char *name = (*list)->dirname;
size_t namelen = (*list)->dirnamelen;
if (namelen == 0)
{
/* The empty string denotes the current directory. */
name = ".";
namelen = 1;
}
else if (namelen > 1)
/* Remove the trailing slash. */
--namelen;
_dl_write (STDOUT_FILENO, name, namelen);
_dl_printf (" (%s)\n", (*list)->what);
}
}
/* Prints the library search path. See _dl_init_paths in dl-load.c
how this information is populated. */
static void
print_search_path_for_help (struct dl_main_state *state)
{
if (__rtld_search_dirs.dirs == NULL)
/* The run-time search paths have not yet been initialized. */
_dl_init_paths (state->library_path, state->library_path_source);
_dl_printf ("\nShared library search path:\n");
/* The print order should reflect the processing in
_dl_map_object. */
struct link_map *map = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
if (map != NULL)
print_search_path_for_help_1 (map->l_rpath_dirs.dirs);
print_search_path_for_help_1 (__rtld_env_path_list.dirs);
if (map != NULL)
print_search_path_for_help_1 (map->l_runpath_dirs.dirs);
_dl_printf (" (libraries located via %s)\n", LD_SO_CACHE);
print_search_path_for_help_1 (__rtld_search_dirs.dirs);
}
void
_dl_help (const char *argv0, struct dl_main_state *state)
{
@ -80,5 +135,6 @@ setting environment variables (which would be inherited by subprocesses).\n\
This program interpreter self-identifies as: " RTLD "\n\
",
argv0);
print_search_path_for_help (state);
_exit (EXIT_SUCCESS);
}