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commit 10b39a5124aea509dfeef2f39a0835adb0fb2296
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Fri Oct 9 10:13:14 2020 +0200
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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>
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diff --git a/elf/dl-usage.c b/elf/dl-usage.c
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index 1003a435bfc2b39e..8d39bc9d5442bc59 100644
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--- a/elf/dl-usage.c
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+++ b/elf/dl-usage.c
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@@ -46,6 +46,61 @@ PARTICULAR PURPOSE.\n\
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_exit (EXIT_SUCCESS);
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}
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+/* Print part of the library search path (from a single source). */
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+static void
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+print_search_path_for_help_1 (struct r_search_path_elem **list)
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+{
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+ if (list == NULL || list == (void *) -1)
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+ /* Path is missing or marked as inactive. */
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+ return;
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+
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+ for (; *list != NULL; ++list)
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+ {
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+ _dl_write (STDOUT_FILENO, " ", 2);
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+ const char *name = (*list)->dirname;
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+ size_t namelen = (*list)->dirnamelen;
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+ if (namelen == 0)
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+ {
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+ /* The empty string denotes the current directory. */
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+ name = ".";
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+ namelen = 1;
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+ }
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+ else if (namelen > 1)
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+ /* Remove the trailing slash. */
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+ --namelen;
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+ _dl_write (STDOUT_FILENO, name, namelen);
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+ _dl_printf (" (%s)\n", (*list)->what);
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+ }
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+}
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+
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+/* Prints the library search path. See _dl_init_paths in dl-load.c
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+ how this information is populated. */
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+static void
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+print_search_path_for_help (struct dl_main_state *state)
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+{
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+ if (__rtld_search_dirs.dirs == NULL)
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+ /* The run-time search paths have not yet been initialized. */
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+ _dl_init_paths (state->library_path, state->library_path_source);
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+
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+ _dl_printf ("\nShared library search path:\n");
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+
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+ /* The print order should reflect the processing in
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+ _dl_map_object. */
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+
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+ struct link_map *map = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
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+ if (map != NULL)
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+ print_search_path_for_help_1 (map->l_rpath_dirs.dirs);
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+
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+ print_search_path_for_help_1 (__rtld_env_path_list.dirs);
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+
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+ if (map != NULL)
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+ print_search_path_for_help_1 (map->l_runpath_dirs.dirs);
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+
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+ _dl_printf (" (libraries located via %s)\n", LD_SO_CACHE);
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+
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+ print_search_path_for_help_1 (__rtld_search_dirs.dirs);
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+}
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+
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void
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_dl_help (const char *argv0, struct dl_main_state *state)
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{
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@@ -80,5 +135,6 @@ setting environment variables (which would be inherited by subprocesses).\n\
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This program interpreter self-identifies as: " RTLD "\n\
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",
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argv0);
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+ print_search_path_for_help (state);
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_exit (EXIT_SUCCESS);
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}
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