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- /* __sig_atomic_t, __sigset_t, and related definitions. SVR4 version.
- Copyright (C) 1994 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If
- not, write to the, 1992 Free Software Foundation, Inc., 675 Mass Ave,
- Cambridge, MA 02139, USA. */
-
- #ifndef _SIGSET_H_types
- #define _SIGSET_H_types 1
-
- typedef int __sig_atomic_t;
-
- /* A `sigset_t' has a bit for each signal. */
- typedef struct
- {
- unsigned long int __sigbits[4];
- } __sigset_t;
-
- #endif /* ! _SIGSET_H_types */
-
- /* We only want to define these functions if <signal.h> was actually
- included; otherwise we were included just to define the types. Since we
- are namespace-clean, it wouldn't hurt to define extra macros. But
- trouble can be caused by functions being defined (e.g., any global
- register vars declared later will cause compilation errors). */
-
- #if !defined (_SIGSET_H_fns) && defined (_SIGNAL_H)
- #define _SIGSET_H_fns 1
-
- /* Return a mask that includes SIG only. */
- #define __sigmask(sig) (1 << ((sig) - 1))
-
-
- /* It's easier to assume 8-bit bytes than to get CHAR_BIT. */
- #define __NSSBITS (sizeof (__sigset_t) * 8)
- #define __SSELT(s) ((s) / __NSSBITS)
- #define __SSMASK(s) (1 << ((s) % __NSSBITS))
-
- #ifndef _EXTERN_INLINE
- #define _EXTERN_INLINE extern __inline
- #endif
-
- _EXTERN_INLINE int
- __sigemptyset (__sigset_t *__set)
- {
- __set->__sigbits[0] = __set->__sigbits[1] =
- __set->__sigbits[2] = __set->__sigbits[3] = 0L;
- return 0;
- }
-
- _EXTERN_INLINE int
- __sigfillset (__sigset_t *__set)
- {
- /* SVR4 has a system call for `sigfillset' (!), and it only sets the bits
- for signals [1,31]. Setting bits for unimplemented signals seems
- harmless (and we will find out if it really is). */
- __set->__sigbits[0] = __set->__sigbits[1] =
- __set->__sigbits[2] = __set->__sigbits[3] = -1;
- return 0;
- }
-
- _EXTERN_INLINE int
- __sigaddset (__sigset_t *__set, int __sig)
- {
- __set->__sigbits[__SSELT (__sig)] |= __SSMASK (__sig);
- return 0;
- }
-
- _EXTERN_INLINE int
- __sigdelset (__sigset_t *__set, int __sig)
- {
- __set->__sigbits[__SSELT (__sig)] &= ~__SSMASK (__sig);
- return 0;
- }
-
- _EXTERN_INLINE int
- __sigismember (__const __sigset_t *__set, int __sig)
- {
- if (__set->__sigbits[__SSELT (__sig)] & __SSMASK (__sig))
- return 1;
- return 0;
- }
-
- #endif /* ! _SIGSET_H_fns */
-
-