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90 lines
3.2 KiB
C
90 lines
3.2 KiB
C
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/* __sig_atomic_t, __sigset_t, and related definitions. Linux version.
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Copyright (C) 1991, 1992, 1994, 1996, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef _SIGSET_H_types
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#define _SIGSET_H_types 1
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typedef int __sig_atomic_t;
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/* A `sigset_t' has a bit for each signal. Having 32 * 4 * 8 bits gives
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us up to 1024 signals. */
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#define _SIGSET_NWORDS 32
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typedef struct
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{
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unsigned int __val[_SIGSET_NWORDS];
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} __sigset_t;
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#endif
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/* We only want to define these functions if <signal.h> was actually
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included; otherwise we were included just to define the types. Since we
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are namespace-clean, it wouldn't hurt to define extra macros. But
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trouble can be caused by functions being defined (e.g., any global
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register vars declared later will cause compilation errors). */
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#if !defined (_SIGSET_H_fns) && defined (_SIGNAL_H)
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#define _SIGSET_H_fns 1
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#ifndef _EXTERN_INLINE
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#define _EXTERN_INLINE extern __inline
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#endif
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/* Return a mask that includes the bit for SIG only. */
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#define __sigmask(sig) (((unsigned int) 1) << (((sig) - 1) \
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% (8 * sizeof (unsigned int))))
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/* Return the word index for SIG. */
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#define __sigword(sig) (((sig) - 1) / (8 * sizeof (unsigned int)))
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#if defined __GNUC__ && __GNUC__ >= 2
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#define __sigemptyset(set) \
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(__extension__ ({ unsigned int __cnt; \
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for (__cnt = 0; __cnt < _SIGSET_NWORDS; ++__cnt) \
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(set)->__val[__cnt] = 0; 0; }))
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#define __sigfillset(set) \
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(__extension__ ({ unsigned int __cnt; \
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for (__cnt = 0; __cnt < _SIGSET_NWORDS; ++__cnt) \
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(set)->__val[__cnt] = ~0; 0; }))
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#endif
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/* These functions needn't check for a bogus signal number -- error
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checking is done in the non __ versions. */
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extern int __sigismember (__const __sigset_t *, int);
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extern int __sigaddset (__sigset_t *, int);
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extern int __sigdelset (__sigset_t *, int);
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#define __SIGSETFN(NAME, BODY, CONST) \
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_EXTERN_INLINE int \
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NAME (CONST __sigset_t *__set, int __sig) \
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{ \
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unsigned int __mask = __sigmask (__sig); \
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unsigned int __word = __sigword (__sig); \
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return BODY; \
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}
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__SIGSETFN (__sigismember, (__set->__val[__word] & __mask) ? 1 : 0, __const)
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__SIGSETFN (__sigaddset, ((__set->__val[__word] |= __mask), 0), )
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__SIGSETFN (__sigdelset, ((__set->__val[__word] &= ~__mask), 0), )
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#undef __SIGSETFN
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#endif /* ! _SIGSET_H_fns. */
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