-# Copyright (C) 2016-2018 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 :signal_h);
+use v5.10.1;
+use POSIX qw(dup2 _exit setpgid :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, $pgid) = @_;
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 $syserr;
+ pipe(my ($r, $w));
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: $!";
+ 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): $!";
}
- if ($out != 1) {
- dup2($out, 1) or die "dup2 failed for stdout: $!";
+ if ($pgid >= 0 && !defined(setpgid(0, $pgid))) {
+ die "setpgid(0, $pgid): $!";
}
- if ($err != 2) {
- dup2($err, 2) or die "dup2 failed for stderr: $!";
+ for (keys %SIG) {
+ $SIG{$_} = 'DEFAULT' if substr($_, 0, 1) ne '_';
}
-
+ if ($cd ne '') {
+ chdir $cd or die "chdir $cd: $!";
+ }
+ while (@$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 "delset SIGCHLD: $!";
+ sigprocmask(SIG_SETMASK, $old) or die "SETMASK: ~SIGCHLD: $!";
+ $cmd->[0] = $f;
if ($ENV{MOD_PERL}) {
- exec qw(env -i), @$env, @$cmd;
- die "exec env -i ... $cmd->[0] failed: $!\n";
+ @$cmd = (which('env'), '-i', @$env, @$cmd);
} else {
- local %ENV = map { split(/=/, $_, 2) } @$env;
- exec @$cmd;
- die "exec $cmd->[0] failed: $!\n";
+ %ENV = map { split(/=/, $_, 2) } @$env;
}
+ undef $r;
+ exec { $f } @$cmd;
+ die "exec @$cmd failed: $!";
}
+ close $w;
sigprocmask(SIG_SETMASK, $old) or die "can't unblock signals: $!";
- $! = $syserr;
+ if (my $cerrnum = do { local $/, <$r> }) {
+ $pid = -1;
+ $! = $cerrnum;
+ } else {
+ $! = $syserr;
+ }
$pid;
}