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+[[!meta copyright="Copyright © 2009 Free Software Foundation, Inc."]]
+
+[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
+id="license" text="Permission is granted to copy, distribute and/or modify this
+document under the terms of the GNU Free Documentation License, Version 1.2 or
+any later version published by the Free Software Foundation; with no Invariant
+Sections, no Front-Cover Texts, and no Back-Cover Texts.  A copy of the license
+is included in the section entitled [[GNU Free Documentation
+License|/fdl]]."]]"""]]
+
+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
+
+[[!taglink open_issue_glibc]]