1 # Copyright (C) all contributors <meta@public-inbox.org>
2 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
4 # Pure-Perl implementation of "spawn". This can't take advantage
5 # of vfork, so no speedups under Linux for spawning from large processes.
6 # Do not require this directly, only use from PublicInbox::Spawn
7 package PublicInbox::SpawnPP;
9 use POSIX qw(dup2 _exit setpgid :signal_h);
10 # this is loaded by PublicInbox::Spawn, so we can't use/require it, here
12 # Pure Perl implementation for folks that do not use Inline::C
13 sub pi_fork_exec ($$$$$$$) {
14 my ($redir, $f, $cmd, $env, $rlim, $cd, $pgid) = @_;
15 my $old = POSIX::SigSet->new();
16 my $set = POSIX::SigSet->new();
17 $set->fillset or die "sigfillset: $!";
18 sigprocmask(SIG_SETMASK, $set, $old) or die "SIG_SETMASK(set): $!";
20 pipe(my ($r, $w)) or die "pipe: $!";
21 my $pid = fork // die "fork (+exec) @$cmd: $!\n";
26 syswrite($w, my $num = $! + 0);
29 for my $child_fd (0..$#$redir) {
30 my $parent_fd = $redir->[$child_fd];
31 next if $parent_fd == $child_fd;
32 dup2($parent_fd, $child_fd) or
33 die "dup2($parent_fd, $child_fd): $!";
35 if ($pgid >= 0 && !defined(setpgid(0, $pgid))) {
36 die "setpgid(0, $pgid): $!";
38 $SIG{$_} = 'DEFAULT' for grep(!/\A__/, keys %SIG);
40 chdir $cd or die "chdir $cd: $!";
43 my ($r, $soft, $hard) = splice(@$rlim, 0, 3);
44 BSD::Resource::setrlimit($r, $soft, $hard) or
45 die "setrlimit($r=[$soft,$hard]: $!)";
47 $old->delset(POSIX::SIGCHLD) or die "sigdelset CHLD: $!";
48 sigprocmask(SIG_SETMASK, $old) or die "SIG_SETMASK ~CHLD: $!";
51 $f = PublicInbox::Spawn::which('env');
52 @$cmd = ('env', '-i', @$env, @$cmd);
54 %ENV = map { split(/=/, $_, 2) } @$env;
57 die "exec @$cmd failed: $!";
60 sigprocmask(SIG_SETMASK, $old) or die "SIG_SETMASK(old): $!";
61 if (my $cerrnum = do { local $/, <$r> }) {
63 die "forked child $@: $!";