syscall: support sparc64 (and maybe other big-endian systems)

Thanks to the GCC compile farm project, we can wire up syscalls
for sparc64 and set system-specific SFD_* constants properly.

I've FINALLY figured out how to use POSIX::SigSet to generate
a usable buffer for the syscall perlfunc.  This is required
for endian-neutral behavior and relevant to sparc64, at least.

There's no need for signalfd-related stuff to be constants,
either.  signalfd initialization is never a hot path and a stub
subroutine for constants uses several KB of memory in the
interpreter.

We'll drop the needless SEEK_CUR import while we're importing
O_NONBLOCK, too.

1 files changed, 3 insertions, 3 deletions

diff --git a/t/sigfd.t b/t/sigfd.t
index 07120b64..8daf3137 100644
--- a/t/sigfd.t
+++ b/t/sigfd.t
@@ -4,7 +4,7 @@ use Test::More;
 use IO::Handle;
 use POSIX qw(:signal_h);
 use Errno qw(ENOSYS);
-use PublicInbox::Syscall qw(SFD_NONBLOCK);
+use PublicInbox::Syscall qw($SFD_NONBLOCK);
 require_ok 'PublicInbox::Sigfd';
 
 SKIP: {
@@ -42,8 +42,8 @@ SKIP: {
                 }
                 $sigfd = undef;
 
-                my $nbsig = PublicInbox::Sigfd->new($sig, SFD_NONBLOCK);
-                ok($nbsig, 'Sigfd->new SFD_NONBLOCK works');
+                my $nbsig = PublicInbox::Sigfd->new($sig, $SFD_NONBLOCK);
+                ok($nbsig, 'Sigfd->new $SFD_NONBLOCK works');
                 is($nbsig->wait_once, undef, 'nonblocking ->wait_once');
                 ok($! == Errno::EAGAIN, 'got EAGAIN');
                 kill('HUP', $$) or die "kill $!";