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| | # 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 :signal_h);
# Pure Perl implementation for folks that do not use Inline::C
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) {
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";
}
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): $!\n";
}
if ($cd ne '') {
chdir $cd or die "chdir $cd: $!";
}
$SIG{$_} = 'DEFAULT' for keys %SIG;
$old->delset(POSIX::SIGCHLD) or die "delset SIGCHLD: $!";
sigprocmask(SIG_SETMASK, $old) or die "SETMASK: ~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";
}
}
sigprocmask(SIG_SETMASK, $old) or die "can't unblock signals: $!";
$! = $syserr;
$pid;
}
1;
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