[PATCH] manual: Document the System V sigpause function

[Florian Weimer <fweimer at redhat dot com>]

<signal.h> currently provides only the System V variant of sigpause.
Update the documentation of the function and move it to its own node.

-----
 manual/signal.texi | 35 ++++++++++++++++++++---------------
 1 file changed, 20 insertions(+), 15 deletions(-)

diff --git a/manual/signal.texi b/manual/signal.texi
index 33e6646975..62cec48450 100644
--- a/manual/signal.texi
+++ b/manual/signal.texi
@@ -39,6 +39,8 @@ and synchronize.
 * Signal Stack::                Using a Separate Signal Stack.
 * BSD Signal Handling::         Additional functions for backward
 			         compatibility with BSD.
+* Obsolete Signal Handling::	Deprecated functions for compatibility with
+                                 other sytems.
 @end menu
 
 @node Concepts of Signals
@@ -3295,19 +3297,22 @@ the calling process's signal mask to @var{mask}.  The return value is
 the previous set of blocked signals.
 @end deftypefun
 
-@deftypefun int sigpause (int @var{mask})
-@standards{BSD, signal.h}
-@safety{@prelim{}@mtunsafe{@mtasurace{:sigprocmask/!bsd!linux}}@asunsafe{@asulock{/hurd}}@acunsafe{@aculock{/hurd}}}
-@c sigpause @mtasurace:sigprocmask/!bsd!linux @asulock/hurd @aculock/hurd
-@c [posix]
-@c  __sigpause @mtasurace:sigprocmask/!bsd!linux @asulock/hurd @aculock/hurd
-@c   do_sigpause @mtasurace:sigprocmask/!bsd!linux @asulock/hurd @aculock/hurd
-@c    sigprocmask(0) dup @asulock/hurd @aculock/hurd [no @mtasurace:sigprocmask/bsd(SIG_UNBLOCK)]
-@c    sigdelset dup ok
-@c    sigset_set_old_mask dup ok
-@c    sigsuspend dup @mtasurace:sigprocmask/!bsd!linux @asulock/hurd @aculock/hurd
-This function is the equivalent of @code{sigsuspend} (@pxref{Waiting
-for a Signal}):  it sets the calling process's signal mask to @var{mask},
-and waits for a signal to arrive.  On return the previous set of blocked
-signals is restored.
+@node Obsolete Signal Handling
+@section Obsolete Signal Handling
+
+This section describes deprecated signal handling functions which are
+provided for compatibility with other systems.
+
+@deftypefun int sigpause (int @var{signal})
+@standards{XOPEN, signal.h}
+@safety{@prelim{}@mtunsafe{@mtasurace{:sigprocmask}}@asunsafe{@asulock{/hurd}}@acunsafe{@aculock{/hurd}}}
+This deprecated function is a precursor to the @code{sigsuspend}
+function (@pxref{Waiting for a Signal}): it removes @var{signal} from
+the thread's signal mask, and waits for a signal to arrive.  On return
+the previous set of blocked signals is restored.
+
+New code should use the @code{sigsuspend} function directly.
+
+The @code{sigpause} function in @theglibc{} is the @w{System V}
+variant.  The BSD variant is no longer provided by @theglibc{}.
 @end deftypefun