Follow-up Comment #3, bug #48371 (project hurd):
I patched trans/streamio.c (trivfs_S_io_read) so that, if amount == 0, it
returns success without blocking. I didn't change dev_read because it's
called only from trivfs_S_io_read and I thought it'd be better to avoid
locking global_lock in this case. After installing this change and rebooting,
I then ran as root
rpctrace perl -e 'sysread STDIN, $_, 0' < /dev/klog
and it didn't hang. I also ran "cat /dev/klog", which correctly output the
"unexpected RESEND from keyboard" message from gnumach when I used a key
combination to defocus the virtualbox window. I did not retest /dev/klog
support in rsyslog.
As discussed on #hurd, I don't intend to post the patch itself.
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