optionally support glibc malloc_info via SIGCONT malloc_info

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.

1 files changed, 25 insertions, 0 deletions

diff --git a/t/malloc_info.t b/t/malloc_info.t
new file mode 100644
index 00000000..352ec5cf
--- /dev/null
+++ b/t/malloc_info.t
@@ -0,0 +1,25 @@
+# Copyright (C) 2019 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+use strict;
+use warnings;
+use Test::More;
+use PublicInbox::Spawn ();
+
+if (!PublicInbox::Spawn->can('inbox_malloc_info')) {
+        plan skip_all => 'inbox_malloc_info not enabled';
+}
+
+open my $olderr, '>&', \*STDERR or die "dup stderr: $!";
+open my $tmp, '+>', undef or die "tmpfile: $!";
+open STDERR, '>&', $tmp or die "redirect stderr to \$tmp: $!";
+my @x = map { '0' x (1024 * 1024) } (1..128);
+my $cb = $SIG{CONT};
+$cb->();
+@x = ('hello');
+PublicInbox::Spawn::inbox_malloc_info(0);
+open STDERR, '>&', $olderr or die "restore stderr: $!";
+sysseek($tmp, 0, 0) == 0 or die "sysseek: $!";
+my @info = <$tmp>;
+like($info[0], qr/</, 'output looks like XML');
+
+done_testing;