$OpenBSD: patch-Arch_Unix_ui_c,v 1.1 2001/04/10 00:51:59 espie Exp $
--- Arch/Unix/ui.c.orig	Tue May  7 17:21:34 1996
+++ Arch/Unix/ui.c	Tue Apr 10 02:30:14 2001
@@ -169,6 +169,7 @@ typedef struct sgttyb TERM_SETUP;
 #ifdef __hpux
 #include <sys/bsdtty.h>
 #endif
+#include <unistd.h>
 
 LOCAL void nonblocking_io(void);
 LOCAL void sane_tty(void);
@@ -271,7 +272,7 @@ LOCAL void if_fg_sane_tty(void)
 	}
 
 
-LOCAL void switch_mode(void)
+LOCAL void switch_mode(int sig)
    {
 	TERM_SETUP zap;
 
@@ -358,7 +359,7 @@ LOCAL void nonblocking_io(void)
 		_gs_opt(fileno(stdin), psanity);
 #endif
       }
-   switch_mode();
+   switch_mode(0);
    at_end(if_fg_sane_tty);
    }
 
@@ -385,7 +386,7 @@ LOCAL int may_getchar(void)
    INIT_ONCE;
 
    if (run_in_fg() && !is_fg)
-      switch_mode();
+      switch_mode(0);
 #ifdef OSK
 	if (run_in_fg() && (_gs_rdy(fileno(stdin)) > 0))
 		{