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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 1.4 2021/10/14 19:39:17 sjg Exp $
*/
#ifndef _SIGACT_H
#define _SIGACT_H
#include <sys/cdefs.h>
/*
* most modern systems use void for signal handlers but
* not all.
*/
#ifndef SIG_HDLR
# define SIG_HDLR void
#endif
/*
* 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 SIGKILL
# include <sys/signal.h>
#endif
#ifndef SIG_ERR
# define SIG_ERR (SIG_HDLR (*)())-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
/*
* this is a bit untidy
*/
#ifdef _SIGSET_T_
typedef _SIGSET_T_ sigset_t;
#endif
/*
* POSIX sa_handler should return void, but since we are
* implementing in terms of something else, it may
* be appropriate to use the normal SIG_HDLR return type
*/
struct sigaction
{
SIG_HDLR (*sa_handler)();
sigset_t sa_mask;
int sa_flags;
};
int sigaction ( int /*sig*/, const struct sigaction */*act*/, struct sigaction */*oact*/ );
int sigaddset ( sigset_t */*mask*/, int /*sig*/ );
int sigdelset ( sigset_t */*mask*/, int /*sig*/ );
int sigemptyset ( sigset_t */*mask*/ );
int sigfillset ( sigset_t */*mask*/ );
int sigismember ( const sigset_t */*mask*/, int /*sig*/ );
int sigpending ( sigset_t */*set*/ );
int sigprocmask ( int how, const sigset_t */*set*/, sigset_t */*oset*/ );
int sigsuspend ( sigset_t */*mask*/ );
#ifndef sigmask
# define sigmask(s) (1<<((s)-1) & (32 - 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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