sigset.h
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上传日期:2009-04-28
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- /* __sig_atomic_t, __sigset_t, and related definitions. Linux version.
- Copyright (C) 1991, 1992, 1994, 1996, 1997 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 Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 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
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
- #ifndef _SIGSET_H_types
- # define _SIGSET_H_types 1
- typedef int __sig_atomic_t;
- /* A `sigset_t' has a bit for each signal. */
- # define _SIGSET_NWORDS (1024 / (8 * sizeof (unsigned long int)))
- typedef struct
- {
- unsigned long int __val[_SIGSET_NWORDS];
- } __sigset_t;
- #endif
- /* 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
- # ifndef _EXTERN_INLINE
- # define _EXTERN_INLINE extern __inline
- # endif
- /* Return a mask that includes the bit for SIG only. */
- # define __sigmask(sig)
- (((unsigned long int) 1) << (((sig) - 1) % (8 * sizeof (unsigned long int))))
- /* Return the word index for SIG. */
- # define __sigword(sig) (((sig) - 1) / (8 * sizeof (unsigned long int)))
- # if defined __GNUC__ && __GNUC__ >= 2
- # define __sigemptyset(set)
- (__extension__ ({ int __cnt = _SIGSET_NWORDS;
- sigset_t *__set = (set);
- while (--__cnt >= 0) __set->__val[__cnt] = 0;
- 0; }))
- # define __sigfillset(set)
- (__extension__ ({ int __cnt = _SIGSET_NWORDS;
- sigset_t *__set = (set);
- while (--__cnt >= 0) __set->__val[__cnt] = ~0UL;
- 0; }))
- # ifdef __USE_GNU
- /* The POSIX does not specify for handling the whole signal set in one
- command. This is often wanted and so we define three more functions
- here. */
- # define __sigisemptyset(set)
- (__extension__ ({ int __cnt = _SIGSET_NWORDS;
- const sigset_t *__set = (set);
- int __ret = __set->__val[--__cnt];
- while (!__ret && --__cnt >= 0)
- __ret = __set->__val[__cnt];
- __ret == 0; }))
- # define __sigandset(dest, left, right)
- (__extension__ ({ int __cnt = _SIGSET_NWORDS;
- sigset_t *__dest = (dest);
- const sigset_t *__left = (left);
- const sigset_t *__right = (right);
- while (--__cnt >= 0)
- __dest->__val[__cnt] = (__left->__val[__cnt]
- & __right->__val[__cnt]);
- 0; }))
- # define __sigorset(dest, left, right)
- (__extension__ ({ int __cnt = _SIGSET_NWORDS;
- sigset_t *__dest = (dest);
- const sigset_t *__left = (left);
- const sigset_t *__right = (right);
- while (--__cnt >= 0)
- __dest->__val[__cnt] = (__left->__val[__cnt]
- | __right->__val[__cnt]);
- 0; }))
- # endif
- # endif
- /* These functions needn't check for a bogus signal number -- error
- checking is done in the non __ versions. */
- extern int __sigismember (__const __sigset_t *, int);
- extern int __sigaddset (__sigset_t *, int);
- extern int __sigdelset (__sigset_t *, int);
- # ifdef __USE_EXTERN_INLINES
- # define __SIGSETFN(NAME, BODY, CONST)
- _EXTERN_INLINE int
- NAME (CONST __sigset_t *__set, int __sig)
- {
- unsigned long int __mask = __sigmask (__sig);
- unsigned long int __word = __sigword (__sig);
- return BODY;
- }
- __SIGSETFN (__sigismember, (__set->__val[__word] & __mask) ? 1 : 0, __const)
- __SIGSETFN (__sigaddset, ((__set->__val[__word] |= __mask), 0), )
- __SIGSETFN (__sigdelset, ((__set->__val[__word] &= ~__mask), 0), )
- # undef __SIGSETFN
- # endif
- #endif /* ! _SIGSET_H_fns. */