Some bits about this, some bits about that.
Controlling TTY
Hurd controlling tty behavior is generally consistent with BSD's, including
TIOCSCTTY. Linux also has TIOCSCTTY and it is harmless to use it there.
But BSD and Hurd never do an implicit TIOCSCTTY (hence our O_NOCTTY is
zero).
C.f. http://lists.gnu.org/archive/html/bug-hurd/2009-10/msg00030.html and the following messages.
Sinals
Unix signals are implemented in glibc.
In every process, signals are handled in a separate signal thread.
[Why does kill hang sometimes?]
<youpi> kill send the signal to the process
<youpi> if the process is hung, killing waits
<youpi> signals should be just asynchronous, but apparently for some reason
Roland & co wanted some syunchronization