2 # Copyright (C) 2020-2021 all contributors <meta@public-inbox.org>
3 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
6 use Socket qw(AF_UNIX SOCK_SEQPACKET MSG_EOR pack_sockaddr_un);
7 use PublicInbox::CmdIPC4;
10 my $recv_cmd = PublicInbox::CmdIPC4->can('recv_cmd4');
11 my $send_cmd = PublicInbox::CmdIPC4->can('send_cmd4') // do {
12 require PublicInbox::Spawn; # takes ~50ms even if built *sigh*
13 $recv_cmd = PublicInbox::Spawn->can('recv_cmd4');
14 PublicInbox::Spawn->can('send_cmd4');
19 my ($fds, $argc, @argv) = @_;
20 die "BUG: already exec-ed\n" if @orig_pid;
22 require POSIX; # WNOHANG
23 my @old = (*STDIN{IO}, *STDOUT{IO}, *STDERR{IO});
26 open(my $tmpfh, '+<&=', $fd) or die "open +<&=$fd: $!";
27 push @rdr, shift(@old), $tmpfh;
29 my $pid = fork // die "fork: $!";
31 POSIX::setsid() > 0 or die "setsid: $!";
32 return; # continue $recv_cmd in background
34 my %env = map { split(/=/, $_, 2) } splice(@argv, $argc);
35 while (my ($old_io, $tmpfh) = splice(@rdr, 0, 2)) {
36 open $old_io, '+<&', $tmpfh or die "open +<&=: $!";
38 @ENV{keys %env} = values %env;
40 warn "exec: @argv: $!\n";
44 if ($send_cmd && eval {
46 my $runtime_dir = ($ENV{XDG_RUNTIME_DIR} // '') . '/lei';
47 if ($runtime_dir eq '/lei') {
49 $runtime_dir = File::Spec->tmpdir."/lei-$<";
51 unless (-d $runtime_dir) {
53 File::Path::mkpath($runtime_dir, 0, 0700);
55 "$runtime_dir/$narg.seq.sock";
57 my $addr = pack_sockaddr_un($path);
58 socket($sock, AF_UNIX, SOCK_SEQPACKET, 0) or die "socket: $!";
59 unless (connect($sock, $addr)) { # start the daemon if not started
60 local $ENV{PERL5LIB} = join(':', @INC);
61 open(my $daemon, '-|', $^X, qw[-MPublicInbox::LEI
62 -E PublicInbox::LEI::lazy_start(@ARGV)],
63 $path, $! + 0, $narg) or die "popen: $!";
64 while (<$daemon>) { warn $_ } # EOF when STDERR is redirected
65 close($daemon) or warn <<"";
66 lei-daemon could not start, exited with \$?=$?
68 # try connecting again anyways, unlink+bind may be racy
69 connect($sock, $addr) or die <<"";
70 connect($path): $! (after attempted daemon start)
71 Falling back to (slow) one-shot mode
74 # (Socket::MsgHdr|Inline::C), $sock are all available:
75 open my $dh, '<', '.' or die "open(.) $!";
76 my $buf = join("\0", scalar(@ARGV), @ARGV);
77 while (my ($k, $v) = each %ENV) { $buf .= "\0$k=$v" }
79 my $n = $send_cmd->($sock, [0, 1, 2, fileno($dh)], $buf, MSG_EOR);
81 die "sendmsg: $! (check RLIMIT_NOFILE)\n" if $!{ETOOMANYREFS};
85 }) { # connected and request sent to lei-daemon, wait for responses or EOF
88 my (@fds) = $recv_cmd->($sock, my $buf, 4096 * 33);
89 if (scalar(@fds) == 1 && !defined($fds[0])) {
91 last if $!{ECONNRESET};
95 if ($buf =~ /\Aexec (.+)\z/) {
96 $exec_cmd->(\@fds, split(/\0/, $1));
97 } elsif ($buf eq '-WINCH') {
98 kill($buf, @orig_pid); # for MUA
99 } elsif ($buf =~ /\Ax_it ([0-9]+)\z/) {
102 } elsif ($buf =~ /\Achild_error ([0-9]+)\z/) {
108 if (my $sig = ($x_it_code & 127)) {
112 exit($x_it_code >> 8);
113 } else { # for systems lacking Socket::MsgHdr or Inline::C
115 require PublicInbox::LEI;
116 PublicInbox::LEI::oneshot(__PACKAGE__);