From a88a3482b5a6315258761b9f80fd6a7e086c1462 Mon Sep 17 00:00:00 2001
From: Willy Tarreau <w@1wt.eu>
Date: Thu, 23 Nov 2023 08:26:52 +0100
Subject: [PATCH] MINOR: debug: dump the mapping of the libs into post_mortem

Having the libs and their addresses listed in the post_mortem struct
is also helpful. Sometimes it helps notice that one version is not the
expected one, e.g. due to some LD_LIBRARY_PATH. We don't emit it on
"show dev" however since that's already available via "show libs".
---
 src/debug.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/src/debug.c b/src/debug.c
index 837061505..f964e7e20 100644
--- a/src/debug.c
+++ b/src/debug.c
@@ -106,6 +106,11 @@ struct post_mortem {
 		} thread_info[MAX_THREADS];
 #endif
 	} process;
+
+#if defined(HA_HAVE_DUMP_LIBS)
+	/* information about dynamic shared libraries involved */
+	char *libs;                      // dump of one addr / path per line, or NULL
+#endif
 } post_mortem ALIGNED(256) = { };
 
 /* Points to a copy of the buffer where the dump functions should write, when
@@ -2147,11 +2152,26 @@ static int feed_post_mortem()
 	if (strcmp(post_mortem.platform.utsname.sysname, "Linux") == 0)
 		feed_post_mortem_linux();
 
+#if defined(HA_HAVE_DUMP_LIBS)
+	chunk_reset(&trash);
+	if (dump_libs(&trash, 1))
+		post_mortem.libs = strdup(trash.area);
+#endif
+
 	return ERR_NONE;
 }
 
 REGISTER_POST_CHECK(feed_post_mortem);
 
+static void deinit_post_mortem(void)
+{
+#if defined(HA_HAVE_DUMP_LIBS)
+	ha_free(&post_mortem.libs);
+#endif
+}
+
+REGISTER_POST_DEINIT(deinit_post_mortem);
+
 #ifdef USE_THREAD
 /* init code is called one at a time so let's collect all per-thread info on
  * the last starting thread. These info are not critical anyway and there's no