[PATCH 1/2] ds: use constants for @UNBLOCKABLE list

[Eric Wong <e@80x24.org>]

There's no need for for a complicated map {} block here.  All
these unblockable signals are POSIX since 2001 at the latest, so
there's no reason any platform would lack them.
---
 lib/PublicInbox/DS.pm | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/lib/PublicInbox/DS.pm b/lib/PublicInbox/DS.pm
index ff10c9c0..657a0373 100644
--- a/lib/PublicInbox/DS.pm
+++ b/lib/PublicInbox/DS.pm
@@ -193,11 +193,9 @@ sub RunTimers {
 
 sub sig_setmask { sigprocmask(SIG_SETMASK, @_) or die "sigprocmask: $!" }
 
-our @UNBLOCKABLE = map { # ensure we detect bugs, HW problems and user rlimits
-	my $cb = POSIX->can("SIG$_");
-	my $num = $cb ? $cb->() : undef;
-	$num ? ($num) : ();
-} qw(ABRT BUS FPE ILL SEGV XCPU XFSZ);
+# ensure we detect bugs, HW problems and user rlimits
+our @UNBLOCKABLE = (POSIX::SIGABRT, POSIX::SIGBUS, POSIX::SIGFPE,
+	POSIX::SIGILL, POSIX::SIGSEGV, POSIX::SIGXCPU, POSIX::SIGXFSZ);
 
 sub block_signals { # anything in @_ stays unblocked
 	my $newset = POSIX::SigSet->new;