From f5795a6092d6b4842e97bc67c11637d792961cb5 Mon Sep 17 00:00:00 2001
From: Eric Wong <e@80x24.org>
Date: Mon, 10 Jun 2019 09:52:13 +0000
Subject: optionally support glibc malloc_info via SIGCONT

If run with PERL_INLINE_DIRECTORY for Inline::C support
along with INBOX_DEBUG=malloc_info, we can allow users
to opt-in to compiling extra code to support the glibc
malloc_info(3) function.

We'll also add SIGCONT handler to dump the malloc_info(3)
output to stderr on our daemons.
---
 lib/PublicInbox/Spawn.pm | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'lib')

diff --git a/lib/PublicInbox/Spawn.pm b/lib/PublicInbox/Spawn.pm
index 66b916df..9210f111 100644
--- a/lib/PublicInbox/Spawn.pm
+++ b/lib/PublicInbox/Spawn.pm
@@ -149,6 +149,23 @@ int pi_fork_exec(int in, int out, int err,
 }
 VFORK_SPAWN
 
+# TODO: we may support other mallocs through this parameter
+if (($ENV{INBOX_DEBUG} // '') =~ /\bmalloc_info\b/) {
+	$vfork_spawn .= <<MALLOC_DEBUG;
+#include <malloc.h>
+
+int inbox_malloc_info(int options)
+{
+	int rc = malloc_info(options, stderr);
+
+	return rc == 0 ? TRUE : FALSE;
+}
+MALLOC_DEBUG
+
+	# dump malloc info to stderr on SIGCONT
+	$SIG{CONT} = sub { inbox_malloc_info(0) };
+}
+
 my $inline_dir = $ENV{PERL_INLINE_DIRECTORY};
 $vfork_spawn = undef unless defined $inline_dir && -d $inline_dir && -w _;
 if (defined $vfork_spawn) {
-- 
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