From: Eric Wong <e@80x24.org>
To: meta@public-inbox.org
Subject: [PATCH 08/17] daemon: use sigprocmask to block signals at startup
Date: Sun, 24 Nov 2019 00:22:28 +0000 [thread overview]
Message-ID: <20191124002237.15713-9-e@80x24.org> (raw)
In-Reply-To: <20191124002237.15713-1-e@80x24.org>
`$SIG{FOO} = "IGNORE"' will cause the daemon to miss signals
entirely. Instead, we can use sigprocmask to block signal
delivery until we have our signal handlers setup. This closes a
race where a PID file can be written for an init script and a
signal to be dropped via "IGNORE".
---
lib/PublicInbox/Daemon.pm | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/lib/PublicInbox/Daemon.pm b/lib/PublicInbox/Daemon.pm
index b3743f5c..e830a98f 100644
--- a/lib/PublicInbox/Daemon.pm
+++ b/lib/PublicInbox/Daemon.pm
@@ -8,7 +8,7 @@ use warnings;
use Getopt::Long qw/:config gnu_getopt no_ignore_case auto_abbrev/;
use IO::Handle;
use IO::Socket;
-use POSIX qw(WNOHANG);
+use POSIX qw(WNOHANG :signal_h);
use Socket qw(IPPROTO_TCP SOL_SOCKET);
sub SO_ACCEPTFILTER () { 0x1000 }
use Cwd qw/abs_path/;
@@ -19,7 +19,7 @@ require PublicInbox::EvCleanup;
require PublicInbox::Listener;
require PublicInbox::ParentPipe;
my @CMD;
-my $set_user;
+my ($set_user, $oldset);
my (@cfg_listen, $stdout, $stderr, $group, $user, $pid_file, $daemonize);
my $worker_processes = 1;
my @listeners;
@@ -76,9 +76,11 @@ sub accept_tls_opt ($) {
sub daemon_prepare ($) {
my ($default_listen) = @_;
+ $oldset = POSIX::SigSet->new();
+ my $newset = POSIX::SigSet->new();
+ $newset->fillset or die "fillset: $!";
+ sigprocmask(SIG_SETMASK, $newset, $oldset) or die "sigprocmask: $!";
@CMD = ($0, @ARGV);
- $SIG{HUP} = $SIG{USR1} = $SIG{USR2} = $SIG{PIPE} =
- $SIG{TTIN} = $SIG{TTOU} = $SIG{WINCH} = 'IGNORE';
my %opts = (
'l|listen=s' => \@cfg_listen,
'1|stdout=s' => \$stdout,
@@ -482,6 +484,7 @@ sub master_loop {
syswrite($w, '.');
};
}
+ sigprocmask(SIG_SETMASK, $oldset) or die "sigprocmask: $!";
reopen_logs();
# main loop
my $quit = 0;
@@ -616,6 +619,7 @@ sub daemon_loop ($$$$) {
# this calls epoll_create:
PublicInbox::Listener->new($_, $tls_cb || $post_accept)
} @listeners;
+ sigprocmask(SIG_SETMASK, $oldset) or die "sigprocmask: $!";
PublicInbox::DS->EventLoop;
$parent_pipe = undef;
}
next prev parent reply other threads:[~2019-11-24 0:22 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-15 9:50 [PATCH 00/29] speed up tests by preloading Eric Wong
2019-11-15 9:50 ` [PATCH 01/29] edit: pass global variables into subs Eric Wong
2019-11-15 9:50 ` [PATCH 02/29] edit: use OO API of File::Temp to shorten lifetime Eric Wong
2019-11-15 9:50 ` [PATCH 03/29] admin: get rid of singleton $CFG var Eric Wong
2019-11-15 9:50 ` [PATCH 04/29] index: pass global variables into subs Eric Wong
2019-11-15 9:50 ` [PATCH 05/29] init: " Eric Wong
2019-11-15 9:50 ` [PATCH 06/29] mda: " Eric Wong
2019-11-15 9:50 ` [PATCH 07/29] learn: " Eric Wong
2019-11-15 9:50 ` [PATCH 08/29] inboxwritable: add ->cleanup method Eric Wong
2019-11-15 9:50 ` [PATCH 09/29] import: only pass Inbox object to SearchIdx->new Eric Wong
2019-11-15 9:50 ` [PATCH 10/29] xapcmd: do not fire END and DESTROY handlers in child Eric Wong
2019-11-15 9:50 ` [PATCH 11/29] spawn: which: allow embedded slash for relative path Eric Wong
2019-11-15 9:50 ` [PATCH 12/29] t/common: introduce run_script wrapper for t/cgi.t Eric Wong
2019-11-15 9:50 ` [PATCH 13/29] t/edit: switch to use run_script Eric Wong
2019-11-15 9:50 ` [PATCH 14/29] t/init: convert to using run_script Eric Wong
2019-11-15 9:50 ` [PATCH 15/29] t/purge: convert to run_script Eric Wong
2019-11-15 9:50 ` [PATCH 16/29] t/v2mirror: get rid of IPC::Run dependency Eric Wong
2019-11-15 9:50 ` [PATCH 17/29] t/mda: switch to run_script for testing Eric Wong
2019-11-15 9:50 ` [PATCH 18/29] t/mda_filter_rubylang: drop IPC::Run dependency Eric Wong
2019-11-15 9:50 ` [PATCH 19/29] doc: remove IPC::Run as a dev and test dependency Eric Wong
2019-11-15 9:50 ` [PATCH 20/29] t/v2mirror: switch to default run_mode for speedup Eric Wong
2019-11-15 9:50 ` [PATCH 21/29] t/convert-compact: convert to run_script Eric Wong
2019-11-15 9:50 ` [PATCH 22/29] t/httpd: use run_script for -init Eric Wong
2019-11-15 9:50 ` [PATCH 23/29] t/watch_maildir_v2: " Eric Wong
2019-11-15 9:50 ` [PATCH 24/29] t/nntpd: " Eric Wong
2019-11-15 9:50 ` [PATCH 25/29] t/watch_filter_rubylang: run_script for -init and -index Eric Wong
2019-11-15 9:50 ` [PATCH 26/29] t/v2mda: switch to run_script in many places Eric Wong
2019-11-15 9:50 ` [PATCH 27/29] t/indexlevels-mirror*: switch to run_script Eric Wong
2019-11-15 9:50 ` [PATCH 28/29] t/xcpdb-reshard: use run_script for -xcpdb Eric Wong
2019-11-15 9:51 ` [PATCH 29/29] t/common: start_script replaces spawn_listener Eric Wong
2019-11-16 6:52 ` Eric Wong
2019-11-16 11:43 ` Eric Wong
2019-11-24 0:22 ` [PATCH 00/17] test fixes and cleanups Eric Wong
2019-11-24 0:22 ` [PATCH 01/17] tests: disable daemon workers in a few more places Eric Wong
2019-11-24 0:22 ` [PATCH 02/17] tests: use strict everywhere Eric Wong
2019-11-24 0:22 ` [PATCH 03/17] t/v1-add-remove-add: quiet down "git init" Eric Wong
2019-11-24 0:22 ` [PATCH 04/17] t/xcpdb-reshard: test xcpdb --compact Eric Wong
2019-11-24 0:22 ` [PATCH 05/17] t/httpd-corner: wait for worker process death Eric Wong
2019-11-24 0:22 ` [PATCH 06/17] t/nntpd-tls: sometimes SSL_connect succeeds quickly Eric Wong
2019-11-24 0:22 ` [PATCH 07/17] .gitignore: ignore local prove(1) files Eric Wong
2019-11-24 0:22 ` Eric Wong [this message]
2019-11-24 0:22 ` [PATCH 09/17] daemon: use sigprocmask when respawning workers Eric Wong
2019-11-24 0:22 ` [PATCH 10/17] daemon: avoid race when quitting workers Eric Wong
2019-11-25 8:59 ` Eric Wong
2019-11-27 1:33 ` [PATCH 0/2] fix kqueue support and missed signal wakeups Eric Wong
2019-11-27 1:33 ` [PATCH 1/2] dskqxs: fix missing EV_DISPATCH define Eric Wong
2019-11-27 1:33 ` [PATCH 2/2] httpd|nntpd: avoid missed signal wakeups Eric Wong
2019-11-24 0:22 ` [PATCH 11/17] t/common: start_script replaces spawn_listener Eric Wong
2019-11-24 0:22 ` [PATCH 12/17] t/nntpd-validate: get rid of threads dependency Eric Wong
2019-11-24 0:22 ` [PATCH 13/17] xapcmd: replace Xtmpdirs with File::Temp->newdir Eric Wong
2019-11-24 0:22 ` [PATCH 14/17] tests: use File::Temp->newdir instead of tempdir() Eric Wong
2019-11-24 0:22 ` [PATCH 15/17] tests: quiet down commit graph Eric Wong
2019-11-24 0:22 ` [PATCH 16/17] t/perf-*.t: use $ENV{GIANT_INBOX_DIR} consistently Eric Wong
2019-11-24 0:22 ` [PATCH 17/17] tests: move giant inbox/git dependent tests to xt/ Eric Wong
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