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* [glibc/fw/glibc-hwcaps] elf: Add library search path information to ld.so --help
@ 2020-10-01 16:54 Florian Weimer
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From: Florian Weimer @ 2020-10-01 16:54 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=eb770614c0c8080d999f755aa4cd52bd21b91155
commit eb770614c0c8080d999f755aa4cd52bd21b91155
Author: Florian Weimer <fweimer@redhat.com>
Date: Tue Jun 9 11:51:12 2020 +0200
elf: Add library search path information to ld.so --help
Diff:
---
elf/dl-usage.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 56 insertions(+)
diff --git a/elf/dl-usage.c b/elf/dl-usage.c
index 0a62e8f7cf..20aa715cb1 100644
--- a/elf/dl-usage.c
+++ b/elf/dl-usage.c
@@ -46,6 +46,61 @@ PARTICULAR PURPOSE.\n\
_exit (0);
}
+/* 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)
+ {
+ (void) _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;
+ (void) _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 inherted by subprocesses).\n\
This program interpreter self-identifies as: " RTLD "\n\
",
argv0);
+ print_search_path_for_help (state);
_exit (0);
}
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