[PATCH 01/11] ds: new: avoid redundant check, make clobbering fatal

[Eric Wong <e@yhbt.net>]

"fileno(undef)" already dies under "use strict", so there's no
need to check for it ourselves.  As far as "fileno($closed_io)"
or "fileno($fake_io)" goes, we'll let epoll_ctl detect the
error, instead.

Our design should make DescriptorMap entries impossible to clobber,
so make it fatal via confess in case it does happen, because
inadvertantly clobbering a FD would be very bad.  While we're at
it, remove a redundant return statement and rely on implicit
returns.
---
 lib/PublicInbox/DS.pm | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/lib/PublicInbox/DS.pm b/lib/PublicInbox/DS.pm
index 09dc3992..00b5dca7 100644
--- a/lib/PublicInbox/DS.pm
+++ b/lib/PublicInbox/DS.pm
@@ -337,9 +337,6 @@ sub new {
     $self->{sock} = $sock;
     my $fd = fileno($sock);
 
-    Carp::cluck("undef sock and/or fd in PublicInbox::DS->new.  sock=" . ($sock || "") . ", fd=" . ($fd || ""))
-        unless $sock && $fd;
-
     _InitPoller();
 
     if (epoll_ctl($Epoll, EPOLL_CTL_ADD, $fd, $ev)) {
@@ -349,11 +346,10 @@ sub new {
         }
         die "couldn't add epoll watch for $fd: $!\n";
     }
-    Carp::cluck("PublicInbox::DS::new blowing away existing descriptor map for fd=$fd ($DescriptorMap{$fd})")
-        if $DescriptorMap{$fd};
+    confess("DescriptorMap{$fd} defined ($DescriptorMap{$fd})")
+        if defined($DescriptorMap{$fd});
 
     $DescriptorMap{$fd} = $self;
-    return $self;
 }