diff options
Diffstat (limited to 'sys/sys/_sigset.h')
| -rw-r--r-- | sys/sys/_sigset.h | 53 |
1 files changed, 30 insertions, 23 deletions
diff --git a/sys/sys/_sigset.h b/sys/sys/_sigset.h index c26054b..515a00d 100644 --- a/sys/sys/_sigset.h +++ b/sys/sys/_sigset.h @@ -36,16 +36,17 @@ * SUCH DAMAGE. * * @(#)signal.h 8.2 (Berkeley) 1/21/94 - * $Id: signal.h,v 1.2 1994/08/02 07:53:32 davidg Exp $ + * $Id: signal.h,v 1.3 1995/01/29 01:19:25 ats Exp $ */ #ifndef _SYS_SIGNAL_H_ #define _SYS_SIGNAL_H_ -#define NSIG 32 /* counting 0; could be 33 (mask is 1-32) */ +#include <sys/cdefs.h> +#include <machine/signal.h> /* sig_atomic_t; trap codes; sigcontext */ -#ifndef _ANSI_SOURCE -#include <machine/signal.h> /* sigcontext; codes for SIGILL, SIGFPE */ +#if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE) +#define NSIG 32 /* counting 0; could be 33 (mask is 1-32) */ #endif #define SIGHUP 1 /* hangup */ @@ -93,19 +94,27 @@ #define SIGUSR1 30 /* user defined signal 1 */ #define SIGUSR2 31 /* user defined signal 2 */ -#if defined(_ANSI_SOURCE) || defined(__cplusplus) -/* - * Language spec sez we must list exactly one parameter, even though we +/*- + * Type of a signal handling function. + * + * Language spec sez signal handlers take exactly one arg, even though we * actually supply three. Ugh! + * + * We don't try to hide the difference by leaving out the args because + * that would cause warnings about conformant programs. Nonconformant + * programs can avoid the warnings by casting to (__sighandler_t *) or + * sig_t before calling signal() or assigning to sa_handler or sv_handler. + * + * The kernel should reverse the cast before calling the function. It + * has no way to do this, but on most machines 1-arg and 3-arg functions + * have the same calling protocol so there is no problem in practice. + * A bit in sa_flags could be used to specify the number of args. */ -#define SIG_DFL (void (*)(int))0 -#define SIG_IGN (void (*)(int))1 -#define SIG_ERR (void (*)(int))-1 -#else -#define SIG_DFL (void (*)())0 -#define SIG_IGN (void (*)())1 -#define SIG_ERR (void (*)())-1 -#endif +typedef void __sighandler_t __P((int)); + +#define SIG_DFL ((__sighandler_t *)0) +#define SIG_IGN ((__sighandler_t *)1) +#define SIG_ERR ((__sighandler_t *)-1) #ifndef _ANSI_SOURCE typedef unsigned int sigset_t; @@ -114,13 +123,13 @@ typedef unsigned int sigset_t; * Signal vector "template" used in sigaction call. */ struct sigaction { - void (*sa_handler)(); /* signal handler */ + __sighandler_t *sa_handler; /* signal handler */ sigset_t sa_mask; /* signal mask to apply */ int sa_flags; /* see signal options below */ }; #ifndef _POSIX_SOURCE #define SA_ONSTACK 0x0001 /* take signal on signal stack */ -#define SA_RESTART 0x0002 /* restart system on signal return */ +#define SA_RESTART 0x0002 /* restart system call on signal return */ #define SA_DISABLE 0x0004 /* disable taking signals on alternate stack */ #ifdef COMPAT_SUNOS #define SA_USERTRAMP 0x0100 /* do not bounce off kernel's sigtramp */ @@ -136,10 +145,7 @@ struct sigaction { #define SIG_SETMASK 3 /* set specified signal set */ #ifndef _POSIX_SOURCE -#ifndef KERNEL -#include <sys/cdefs.h> -#endif -typedef void (*sig_t) __P((int)); /* type of signal function */ +typedef __sighandler_t *sig_t; /* type of pointer to a signal function */ /* * Structure used in sigaltstack call. @@ -157,7 +163,7 @@ struct sigaltstack { * Signal vector "template" used in sigvec call. */ struct sigvec { - void (*sv_handler)(); /* signal handler */ + __sighandler_t *sv_handler; /* signal handler */ int sv_mask; /* signal mask to apply */ int sv_flags; /* see signal options below */ }; @@ -190,6 +196,7 @@ struct sigstack { * defined by <sys/signal.h>. */ __BEGIN_DECLS -void (*signal __P((int, void (*) __P((int))))) __P((int)); +__sighandler_t *signal __P((int, __sighandler_t *)); __END_DECLS + #endif /* !_SYS_SIGNAL_H_ */ |
