/* NAME: *      sigact.h - sigaction et al * * SYNOPSIS: *      #include "sigact.h" * * DESCRIPTION: *      This header is the interface to a fake sigaction(2)  *      implementation. It provides a POSIX compliant interface  *      to whatever signal handling mechanisms are available. *      It also provides a Signal() function that is implemented  *      in terms of sigaction(). *      If not using signal(2) as part of the underlying  *      implementation (USE_SIGNAL or USE_SIGMASK), and  *      NO_SIGNAL is not defined, it also provides a signal()  *      function that calls Signal().  *       * SEE ALSO: *      sigact.c *//* * RCSid: *      $Id: sigact.h,v 1.2 1994/05/31 13:34:34 michael Exp $ *//* Changes to sigact.h for pdksh, Michael Rendell <michael@cs.mun.ca>: *	- changed SIG_HDLR to RETSIGTYPE for use with GNU autoconf *	- added RETSIGVAL *	- ifdef'd out ARGS(), volatile and const initializations *	- ifdef'd out sigset_t definition - let autoconf handle it *	- ifdef out routines not used in ksh if IS_KSH is defined *	  (same in sigact.c). */#ifndef _SIGACT_H#define _SIGACT_H/* * most modern systems use void for signal handlers but * not all. */#ifndef RETSIGTYPE# define RETSIGTYPE void# define RETSIGVAL#endif#if 0 /* ARGS(), volatile and const are already set up in config*.h -mhr */#undef ARGS#if defined(__STDC__) || defined(__cplusplus)# define ARGS(p) p#else# define ARGS(p) ()# define volatile			/* don't optimize please */# define const				/* read only */#endif#endif#ifndef IS_KSHhandler_t Signal	ARGS((int sig, handler_t disp));#endif /* IS_KSH *//* * if you want to install this header as signal.h, * modify this to pick up the original signal.h */#ifndef SIGKILL# include <signal.h>#endif  #ifndef SIG_ERR# define SIG_ERR  ((handler_t) -1)#endif#ifndef BADSIG# define BADSIG  SIG_ERR#endif    #ifndef SA_NOCLDSTOP/* we assume we need the fake sigaction *//* sa_flags */#define	SA_NOCLDSTOP	1		/* don't send SIGCHLD on child stop */#define SA_RESTART	2		/* re-start I/O *//* sigprocmask flags */#define	SIG_BLOCK	1#define	SIG_UNBLOCK	2#define	SIG_SETMASK	4#if 0 /* autoconf will define sigset_t if it isn't available *//* * this is a bit untidy */#if !defined(__sys_stdtypes_h)typedef unsigned int sigset_t;#endif#endif /* 0 */  /* * POSIX sa_handler should return void, but since we are * implementing in terms of something else, it may * be appropriate to use the normal RETSIGTYPE return type */struct sigaction{  handler_t	sa_handler;  sigset_t	sa_mask;  int		sa_flags;};int	sigaction	ARGS(( int sig, struct sigaction *act, struct sigaction *oact ));int	sigaddset	ARGS(( sigset_t *mask, int sig ));#ifndef IS_KSHint	sigdelset	ARGS(( sigset_t *mask, int sig ));#endif /* IS_KSH */int	sigemptyset	ARGS(( sigset_t *mask ));#ifndef IS_KSHint	sigfillset	ARGS(( sigset_t *mask ));int	sigismember	ARGS(( sigset_t *mask, int sig ));int	sigpending	ARGS(( sigset_t *set ));#endif /* IS_KSH */int	sigprocmask	ARGS(( int how, sigset_t *set, sigset_t *oset ));int	sigsuspend	ARGS(( sigset_t *mask ));	#ifndef sigmask# define sigmask(s)	(1<<((s)-1))	/* convert SIGnum to mask */#endif#if !defined(NSIG) && defined(_NSIG)# define NSIG _NSIG#endif#endif /* ! SA_NOCLDSTOP */#endif /* _SIGACT_H */