-# Copyright (C) 2016 all contributors <meta@public-inbox.org>
+# Copyright (C) 2016-2021 all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+
+# Pure-Perl implementation of "spawn". This can't take advantage
+# of vfork, so no speedups under Linux for spawning from large processes.
package PublicInbox::SpawnPP;
use strict;
use warnings;
-use POSIX qw(dup2);
+use POSIX qw(dup2 :signal_h);
# Pure Perl implementation for folks that do not use Inline::C
-sub public_inbox_fork_exec ($$$$$$) {
- my ($in, $out, $err, $f, $cmd, $env) = @_;
+sub pi_fork_exec ($$$$$$) {
+ my ($redir, $f, $cmd, $env, $rlim, $cd) = @_;
+ my $old = POSIX::SigSet->new();
+ my $set = POSIX::SigSet->new();
+ $set->fillset or die "fillset failed: $!";
+ sigprocmask(SIG_SETMASK, $set, $old) or die "can't block signals: $!";
+ my $syserr;
my $pid = fork;
+ unless (defined $pid) { # compat with Inline::C version
+ $syserr = $!;
+ $pid = -1;
+ }
if ($pid == 0) {
- if ($in != 0) {
- dup2($in, 0) or die "dup2 failed for stdin: $!";
+ while (@$rlim) {
+ my ($r, $soft, $hard) = splice(@$rlim, 0, 3);
+ BSD::Resource::setrlimit($r, $soft, $hard) or
+ warn "failed to set $r=[$soft,$hard]\n";
}
- if ($out != 1) {
- dup2($out, 1) or die "dup2 failed for stdout: $!";
+ for my $child_fd (0..$#$redir) {
+ my $parent_fd = $redir->[$child_fd];
+ next if $parent_fd == $child_fd;
+ dup2($parent_fd, $child_fd) or
+ die "dup2($parent_fd, $child_fd): $!\n";
}
- if ($err != 2) {
- dup2($err, 2) or die "dup2 failed for stderr: $!";
+ if ($cd ne '') {
+ chdir $cd or die "chdir $cd: $!";
}
- %ENV = ();
- foreach my $e (@$env) {
- my ($k, $v) = split('=', $e, 2);
- $ENV{$k} = $v;
+ $SIG{$_} = 'DEFAULT' for keys %SIG;
+ my $cset = POSIX::SigSet->new();
+ $cset->addset(POSIX::SIGCHLD) or die "can't add SIGCHLD: $!";
+ sigprocmask(SIG_UNBLOCK, $cset) or
+ die "can't unblock SIGCHLD: $!";
+ if ($ENV{MOD_PERL}) {
+ exec which('env'), '-i', @$env, @$cmd;
+ die "exec env -i ... $cmd->[0] failed: $!\n";
+ } else {
+ local %ENV = map { split(/=/, $_, 2) } @$env;
+ my @cmd = @$cmd;
+ $cmd[0] = $f;
+ exec @cmd;
+ die "exec $cmd->[0] failed: $!\n";
}
- exec @$cmd;
- exit 1;
}
+ sigprocmask(SIG_SETMASK, $old) or die "can't unblock signals: $!";
+ $! = $syserr;
$pid;
}