treewide: favor open(..., '+<&=', $fd)

Cut down on unnecessary imports of IO::Handle and
method lookup + dispatch overhead.

5 files changed, 9 insertions, 9 deletions

diff --git a/examples/unsubscribe.milter b/examples/unsubscribe.milter
index 7b126e30..608524cb 100644
--- a/examples/unsubscribe.milter
+++ b/examples/unsubscribe.milter
@@ -2,7 +2,6 @@
 # Copyright (C) 2016-2021 all contributors <meta@public-inbox.org>
 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
 use strict;
-use warnings;
 use Sendmail::PMilter qw(:all);
 use IO::Socket;
 use Crypt::CBC;
@@ -128,7 +127,7 @@ my $fds = $ENV{LISTEN_FDS};
 if ($fds && (($ENV{LISTEN_PID} || 0) == $$)) {
         die "$0 can only listen on one FD\n" if $fds != 1;
         my $start_fd = 3;
-        my $s = IO::Socket->new_from_fd($start_fd, 'r') or
+        open(my $s, '<&=', $start_fd) or
                 die "inherited bad FD from LISTEN_FDS: $!\n";
         $milter->set_socket($s);
 } else {
diff --git a/lib/PublicInbox/DS.pm b/lib/PublicInbox/DS.pm
index 3cddfd18..7a4dfed0 100644
--- a/lib/PublicInbox/DS.pm
+++ b/lib/PublicInbox/DS.pm
@@ -25,7 +25,6 @@ use v5.10.1;
 use parent qw(Exporter);
 use bytes;
 use POSIX qw(WNOHANG sigprocmask SIG_SETMASK);
-use IO::Handle qw();
 use Fcntl qw(SEEK_SET :DEFAULT O_APPEND);
 use Time::HiRes qw(clock_gettime CLOCK_MONOTONIC);
 use Scalar::Util qw(blessed);
@@ -135,7 +134,7 @@ sub add_timer ($$;@) {
 sub set_cloexec ($) {
     my ($fd) = @_;
 
-    $_io = IO::Handle->new_from_fd($fd, 'r+') or return;
+    open($_io, '+<&=', $fd) or return;
     defined(my $fl = fcntl($_io, F_GETFD, 0)) or return;
     fcntl($_io, F_SETFD, $fl | FD_CLOEXEC);
 }
diff --git a/lib/PublicInbox/Daemon.pm b/lib/PublicInbox/Daemon.pm
index b5f97d81..727311a4 100644
--- a/lib/PublicInbox/Daemon.pm
+++ b/lib/PublicInbox/Daemon.pm
@@ -367,7 +367,7 @@ sub inherit ($) {
         my $end = $fds + 2; # LISTEN_FDS_START - 1
         my @rv = ();
         foreach my $fd (3..$end) {
-                my $s = IO::Handle->new_from_fd($fd, 'r');
+                open(my $s, '<&=', $fd) or warn "fdopen fd=$fd: $!";
                 if (my $k = sockname($s)) {
                         my $prev_was_blocking = $s->blocking(0);
                         warn <<"" if $prev_was_blocking;
diff --git a/lib/PublicInbox/Sigfd.pm b/lib/PublicInbox/Sigfd.pm
index a4d1b3bb..d91ea0e7 100644
--- a/lib/PublicInbox/Sigfd.pm
+++ b/lib/PublicInbox/Sigfd.pm
@@ -8,7 +8,6 @@ use strict;
 use parent qw(PublicInbox::DS);
 use PublicInbox::Syscall qw(signalfd EPOLLIN EPOLLET SFD_NONBLOCK);
 use POSIX ();
-use IO::Handle ();
 
 # returns a coderef to unblock signals if neither signalfd or kqueue
 # are available.
@@ -27,7 +26,7 @@ sub new {
         my $io;
         my $fd = signalfd(-1, [keys %signo], $flags);
         if (defined $fd && $fd >= 0) {
-                $io = IO::Handle->new_from_fd($fd, 'r+');
+                open($io, '+<&=', $fd) or die "open: $!";
         } elsif (eval { require PublicInbox::DSKQXS }) {
                 $io = PublicInbox::DSKQXS->signalfd([keys %signo], $flags);
         } else {
diff --git a/t/epoll.t b/t/epoll.t
index f2a68904..f346b387 100644
--- a/t/epoll.t
+++ b/t/epoll.t
@@ -1,11 +1,14 @@
+#!perl -w
+# Copyright (C) 2020-2021 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
 use strict;
+use v5.10.1;
 use Test::More;
-use IO::Handle;
 use PublicInbox::Syscall qw(:epoll);
 plan skip_all => 'not Linux' if $^O ne 'linux';
 my $epfd = epoll_create();
 ok($epfd >= 0, 'epoll_create');
-my $hnd = IO::Handle->new_from_fd($epfd, 'r+'); # close on exit
+open(my $hnd, '+<&=', $epfd); # for autoclose
 
 pipe(my ($r, $w)) or die "pipe: $!";
 is(epoll_ctl($epfd, EPOLL_CTL_ADD, fileno($w), EPOLLOUT), 0,