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      1 /*	$NetBSD: iosignal.h,v 1.5 2020/05/25 20:47:19 christos Exp $	*/
      2 
      3 #ifndef IOSIGNAL_H
      4 #define IOSIGNAL_H
      5 
      6 #include "ntp_refclock.h"
      7 
      8  /*
      9  * Some systems (MOST) define SIGPOLL == SIGIO, others SIGIO == SIGPOLL, and
     10  * a few have separate SIGIO and SIGPOLL signals.  This code checks for the
     11  * SIGIO == SIGPOLL case at compile time.
     12  * Do not define USE_SIGPOLL or USE_SIGIO.
     13  * these are interal only to iosignal.c and ntpd/work_fork.c!
     14  */
     15 #if defined(USE_SIGPOLL)
     16 # undef USE_SIGPOLL
     17 #endif
     18 #if defined(USE_SIGIO)
     19 # undef USE_SIGIO
     20 #endif
     21 
     22 /* type of input handler function - only shared between iosignal.c and ntp_io.c */
     23 typedef void (input_handler_t)(l_fp *);
     24 
     25 #if defined(HAVE_SIGNALED_IO)
     26 # if defined(USE_TTY_SIGPOLL) || defined(USE_UDP_SIGPOLL)
     27 #  define USE_SIGPOLL
     28 # endif
     29 
     30 # if !defined(USE_TTY_SIGPOLL) || !defined(USE_UDP_SIGPOLL)
     31 #  define USE_SIGIO
     32 # endif
     33 
     34 # if defined(USE_SIGIO) && defined(USE_SIGPOLL)
     35 #  if SIGIO == SIGPOLL
     36 #   define USE_SIGIO
     37 #   undef USE_SIGPOLL
     38 #  endif	/* SIGIO == SIGPOLL */
     39 # endif		/* USE_SIGIO && USE_SIGPOLL */
     40 
     41 #define	USING_SIGIO()	using_sigio
     42 
     43 extern int		using_sigio;
     44 
     45 extern void		block_sigio	(void);
     46 extern void		unblock_sigio	(void);
     47 extern int		init_clock_sig	(struct refclockio *);
     48 extern void		init_socket_sig	(int);
     49 extern void		set_signal	(input_handler_t *);
     50 
     51 # define BLOCKIO()	block_sigio()
     52 # define UNBLOCKIO()	unblock_sigio()
     53 
     54 #else	/* !HAVE_SIGNALED_IO follows */
     55 # define BLOCKIO()	do {} while (0)
     56 # define UNBLOCKIO()	do {} while (0)
     57 # define USING_SIGIO()	FALSE
     58 #endif
     59 
     60 #endif	/* IOSIGNAL_H */
     61