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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 1.5 93/05/05 21:17:04 sjg Exp $
- */
- #ifndef _SIGACT_H
- #define _SIGACT_H
-
- /*
- * most modern systems use void for signal handlers but
- * not all.
- */
- #ifndef SIG_HDLR
- # define SIG_HDLR void
- #endif
-
- #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
-
- SIG_HDLR (*Signal ARGS((int sig, SIG_HDLR (*disp)(int)))) ARGS((int));
-
- /*
- * 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 (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
- */
- #if !defined(__sys_stdtypes_h)
- typedef unsigned int 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 ARGS(( int sig, struct sigaction *act, struct sigaction *oact ));
- int sigaddset ARGS(( sigset_t *mask, int sig ));
- int sigdelset ARGS(( sigset_t *mask, int sig ));
- int sigemptyset ARGS(( sigset_t *mask ));
- int sigfillset ARGS(( sigset_t *mask ));
- int sigismember ARGS(( sigset_t *mask, int sig ));
- int sigpending ARGS(( sigset_t *set ));
- 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 */
-