Remove dead code dealing with POSIX_SIGNALS.

* atimer.c (set_alarm): Remove dead code, all USG systems define
POSIX_SIGNALS.
* data.c (arith_error): Likewise.
* keyboard.c (input_available_signal, handle_user_signal)
(interrupt_signal): Likewise.
* process.c (sigchld_handler): Likewise.
(create_process): Remove if 0 code.  Remove HPUX conditional when
!defined (POSIX_SIGNALS), it cannot be true.
* syssignal.h: Remove USG5_4 and USG conditionals when
!POSIX_SIGNALS, they cannot be true.

1 files changed, 0 insertions, 5 deletions

diff --git a/src/data.c b/src/data.c
index e405ca6af9e..bdba3a9bb36 100644
--- a/src/data.c
+++ b/src/data.c
@@ -3291,11 +3291,6 @@ SIGTYPE
 arith_error (signo)
      int signo;
 {
-#if defined(USG) && !defined(POSIX_SIGNALS)
-  /* USG systems forget handlers when they are used;
-     must reestablish each time */
-  signal (signo, arith_error);
-#endif /* USG */
   sigsetmask (SIGEMPTYMASK);
 
   SIGNAL_THREAD_CHECK (signo);