1 # Copyright (C) 2016-2021 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 package PublicInbox::SpawnPP;
9 use POSIX qw(dup2 _exit setpgid :signal_h);
11 # Pure Perl implementation for folks that do not use Inline::C
12 sub pi_fork_exec ($$$$$$$) {
13 my ($redir, $f, $cmd, $env, $rlim, $cd, $pgid) = @_;
14 my $old = POSIX::SigSet->new();
15 my $set = POSIX::SigSet->new();
16 $set->fillset or die "fillset failed: $!";
17 sigprocmask(SIG_SETMASK, $set, $old) or die "can't block signals: $!";
20 unless (defined $pid) { # compat with Inline::C version
25 $SIG{__DIE__} = sub { warn @_; _exit 1 };
26 for my $child_fd (0..$#$redir) {
27 my $parent_fd = $redir->[$child_fd];
28 next if $parent_fd == $child_fd;
29 dup2($parent_fd, $child_fd) or
30 die "dup2($parent_fd, $child_fd): $!";
32 if ($pgid >= 0 && !defined(setpgid(0, $pgid))) {
33 die "setpgid(0, $pgid): $!";
35 $SIG{$_} = 'DEFAULT' for keys %SIG;
37 chdir $cd or die "chdir $cd: $!";
40 my ($r, $soft, $hard) = splice(@$rlim, 0, 3);
41 BSD::Resource::setrlimit($r, $soft, $hard) or
42 die "setrlimit($r=[$soft,$hard]: $!)";
44 $old->delset(POSIX::SIGCHLD) or die "delset SIGCHLD: $!";
45 sigprocmask(SIG_SETMASK, $old) or die "SETMASK: ~SIGCHLD: $!";
48 @$cmd = (which('env'), '-i', @$env, @$cmd);
50 %ENV = map { split(/=/, $_, 2) } @$env;
53 die "exec @$cmd failed: $!";
55 sigprocmask(SIG_SETMASK, $old) or die "can't unblock signals: $!";