From: Rusty Russell <rusty@rustcorp.com.au>
Date: Fri, 21 Jan 2011 03:50:02 +0000 (+1030)
Subject: lca2011: dump talloc tree on SIGUSR1
X-Git-Url: http://git.ozlabs.org/?a=commitdiff_plain;h=e3096dff04758d433eb415f00d586d144b2ffea4;p=ccan-lca-2011.git

lca2011: dump talloc tree on SIGUSR1

Useful for finding runtime memory leaks.
---

diff --git a/ccan/oserver/oserver.c b/ccan/oserver/oserver.c
index c293dd5..c7a523c 100644
--- a/ccan/oserver/oserver.c
+++ b/ccan/oserver/oserver.c
@@ -306,6 +306,21 @@ static int destroy_oserver(struct oserver *oserver)
 	return 0;
 }
 
+static void talloc_dump(struct tevent_context *ev,
+			struct tevent_signal *se,
+			int signum,
+			int count,
+			void *siginfo,
+			void *_oserver)
+{
+	struct oserver *oserver = _oserver;
+	FILE *f = fopen("/var/run/oserver/talloc.dump", "w");
+	if (f) {
+		talloc_report_full(oserver, f);
+		fclose(f);
+	}
+}
+
 struct oserver *oserver_setup(struct tevent_context *ev, unsigned short port)
 {
 	struct oserver *oserver;
@@ -352,5 +367,9 @@ struct oserver *oserver_setup(struct tevent_context *ev, unsigned short port)
 	/* Don't kill us if client dies. */
 	signal(SIGPIPE, SIG_IGN);
 
+	/* Show talloc tree on SIGUSR1. */
+	tevent_add_signal(ev, oserver, SIGUSR1, SA_RESTART,
+			  talloc_dump, oserver);
+
 	return oserver;
 }