130 lines
3.3 KiB
C
130 lines
3.3 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 1.1.1.1 1996/09/21 23:35:15 jtc Exp $
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*/
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/* Changes to sigact.h for pdksh, Michael Rendell <michael@cs.mun.ca>:
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* - changed SIG_HDLR to RETSIGTYPE for use with GNU autoconf
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* - added RETSIGVAL
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* - ifdef'd out ARGS(), volatile and const initializations
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* - ifdef'd out sigset_t definition - let autoconf handle it
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* - ifdef out routines not used in ksh if IS_KSH is defined
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* (same in sigact.c).
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*/
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#ifndef _SIGACT_H
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#define _SIGACT_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 RETSIGTYPE
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# define RETSIGTYPE void
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# define RETSIGVAL
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#endif
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#if 0 /* ARGS(), volatile and const are already set up in config*.h -mhr */
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#undef ARGS
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#if defined(__STDC__) || defined(__cplusplus)
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# define ARGS(p) p
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#else
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# define ARGS(p) ()
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# define volatile /* don't optimize please */
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# define const /* read only */
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#endif
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#endif
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#ifndef IS_KSH
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handler_t Signal ARGS((int sig, handler_t disp));
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#endif /* IS_KSH */
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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 SIG_ERR
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# define SIG_ERR ((handler_t) -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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#if 0 /* autoconf will define sigset_t if it isn't available */
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/*
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* this is a bit untidy
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*/
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#if !defined(__sys_stdtypes_h)
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typedef unsigned int sigset_t;
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#endif
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#endif /* 0 */
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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 RETSIGTYPE return type
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*/
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struct sigaction
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{
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handler_t 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 ARGS(( int sig, struct sigaction *act, struct sigaction *oact ));
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int sigaddset ARGS(( sigset_t *mask, int sig ));
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#ifndef IS_KSH
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int sigdelset ARGS(( sigset_t *mask, int sig ));
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#endif /* IS_KSH */
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int sigemptyset ARGS(( sigset_t *mask ));
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#ifndef IS_KSH
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int sigfillset ARGS(( sigset_t *mask ));
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int sigismember ARGS(( sigset_t *mask, int sig ));
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int sigpending ARGS(( sigset_t *set ));
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#endif /* IS_KSH */
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int sigprocmask ARGS(( int how, sigset_t *set, sigset_t *oset ));
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int sigsuspend ARGS(( sigset_t *mask ));
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#ifndef sigmask
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# define sigmask(s) (1<<((s)-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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