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| | # Copyright (C) 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.
# Do not require this directly, only use from PublicInbox::Spawn
package PublicInbox::SpawnPP;
use v5.12;
use POSIX qw(dup2 _exit setpgid :signal_h);
use autodie qw(chdir close pipe);
use PublicInbox::OnDestroy;
# this is loaded by PublicInbox::Spawn, so we can't use/require it, here
# Pure Perl implementation for folks that do not use Inline::C
sub pi_fork_exec ($$$$$$$) {
my ($redir, $f, $cmd, $env, $rlim, $cd, $pgid) = @_;
my $old = POSIX::SigSet->new();
my $set = POSIX::SigSet->new();
$set->fillset or die "sigfillset: $!";
for (POSIX::SIGABRT, POSIX::SIGBUS, POSIX::SIGFPE,
POSIX::SIGILL, POSIX::SIGSEGV) {
$set->delset($_) or die "delset($_): $!";
}
sigprocmask(SIG_SETMASK, $set, $old) or die "SIG_SETMASK(set): $!";
pipe(my $r, my $w);
my $pid = PublicInbox::OnDestroy::fork_tmp;
if ($pid == 0) {
close $r;
$SIG{__DIE__} = sub {
warn(@_);
syswrite($w, my $num = $! + 0);
_exit(1);
};
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): $!";
}
if ($pgid >= 0 && !defined(setpgid(0, $pgid))) {
die "setpgid(0, $pgid): $!";
}
$SIG{$_} = 'DEFAULT' for grep(!/\A__/, keys %SIG);
chdir($cd) if $cd ne '';
while (@$rlim) {
my ($r, $soft, $hard) = splice(@$rlim, 0, 3);
BSD::Resource::setrlimit($r, $soft, $hard) or
die "setrlimit($r=[$soft,$hard]: $!)";
}
$old->delset(POSIX::SIGCHLD) or die "sigdelset CHLD: $!";
sigprocmask(SIG_SETMASK, $old) or die "SIG_SETMASK ~CHLD: $!";
$cmd->[0] = $f;
if ($ENV{MOD_PERL}) {
$f = PublicInbox::Spawn::which('env');
@$cmd = ('env', '-i', @$env, @$cmd);
} else {
%ENV = map { split(/=/, $_, 2) } @$env;
}
exec { $f } @$cmd;
die "exec @$cmd failed: $!";
}
close $w;
sigprocmask(SIG_SETMASK, $old) or die "SIG_SETMASK(old): $!";
if (my $cerrnum = do { local $/, <$r> }) {
$! = $cerrnum;
die "forked child $@: $!";
}
$pid;
}
1;
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