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/* 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_KSH
handler_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_KSH
int sigdelset ARGS(( sigset_t *mask, int sig ));
#endif /* IS_KSH */
int sigemptyset ARGS(( sigset_t *mask ));
#ifndef IS_KSH
int 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 */
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