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105 lines
2.5 KiB
C
105 lines
2.5 KiB
C
/* NAME:
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* sigact.h - sigaction et al
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*
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* SYNOPSIS:
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* #include "sigact.h"
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*
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* DESCRIPTION:
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* This header is the interface to a fake sigaction(2)
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* implementation. It provides a POSIX compliant interface
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* to whatever signal handling mechanisms are available.
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* It also provides a Signal() function that is implemented
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* in terms of sigaction().
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* If not using signal(2) as part of the underlying
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* implementation (USE_SIGNAL or USE_SIGMASK), and
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* NO_SIGNAL is not defined, it also provides a signal()
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* function that calls Signal().
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*
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* SEE ALSO:
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* sigact.c
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*/
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/*
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* RCSid:
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* $Id: sigact.h,v 1.4 2021/10/14 19:39:17 sjg Exp $
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*/
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#ifndef _SIGACT_H
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#define _SIGACT_H
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#include <sys/cdefs.h>
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/*
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* most modern systems use void for signal handlers but
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* not all.
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*/
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#ifndef SIG_HDLR
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# define SIG_HDLR void
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#endif
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/*
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* if you want to install this header as signal.h,
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* modify this to pick up the original signal.h
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*/
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#ifndef SIGKILL
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# include <signal.h>
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#endif
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#ifndef SIGKILL
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# include <sys/signal.h>
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#endif
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#ifndef SIG_ERR
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# define SIG_ERR (SIG_HDLR (*)())-1
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#endif
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#ifndef BADSIG
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# define BADSIG SIG_ERR
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#endif
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#ifndef SA_NOCLDSTOP
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/* we assume we need the fake sigaction */
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/* sa_flags */
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#define SA_NOCLDSTOP 1 /* don't send SIGCHLD on child stop */
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#define SA_RESTART 2 /* re-start I/O */
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/* sigprocmask flags */
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#define SIG_BLOCK 1
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#define SIG_UNBLOCK 2
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#define SIG_SETMASK 4
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/*
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* this is a bit untidy
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*/
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#ifdef _SIGSET_T_
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typedef _SIGSET_T_ sigset_t;
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#endif
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/*
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* POSIX sa_handler should return void, but since we are
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* implementing in terms of something else, it may
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* be appropriate to use the normal SIG_HDLR return type
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*/
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struct sigaction
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{
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SIG_HDLR (*sa_handler)();
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sigset_t sa_mask;
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int sa_flags;
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};
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int sigaction ( int /*sig*/, const struct sigaction */*act*/, struct sigaction */*oact*/ );
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int sigaddset ( sigset_t */*mask*/, int /*sig*/ );
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int sigdelset ( sigset_t */*mask*/, int /*sig*/ );
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int sigemptyset ( sigset_t */*mask*/ );
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int sigfillset ( sigset_t */*mask*/ );
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int sigismember ( const sigset_t */*mask*/, int /*sig*/ );
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int sigpending ( sigset_t */*set*/ );
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int sigprocmask ( int how, const sigset_t */*set*/, sigset_t */*oset*/ );
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int sigsuspend ( sigset_t */*mask*/ );
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#ifndef sigmask
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# define sigmask(s) (1<<((s)-1) & (32 - 1)) /* convert SIGnum to mask */
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#endif
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#if !defined(NSIG) && defined(_NSIG)
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# define NSIG _NSIG
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#endif
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#endif /* ! SA_NOCLDSTOP */
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#endif /* _SIGACT_H */
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