98 lines
2.9 KiB
C
98 lines
2.9 KiB
C
/* __sig_atomic_t, __sigset_t, and related definitions. SVR4 version.
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Copyright (C) 1994, 1995 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
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not, write to the, 1992 Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, 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. */
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typedef struct
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{
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unsigned long int __sigbits[4];
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} __sigset_t;
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#endif /* ! _SIGSET_H_types */
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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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/* Return a mask that includes SIG only. */
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#define __sigmask(sig) (1 << ((sig) - 1))
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/* It's easier to assume 8-bit bytes than to get CHAR_BIT. */
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#define __NSSBITS (sizeof (__sigset_t) * 8)
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#define __SSELT(s) ((s) / __NSSBITS)
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#define __SSMASK(s) (1 << ((s) % __NSSBITS))
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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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_EXTERN_INLINE int
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__sigemptyset (__sigset_t *__set)
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{
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__set->__sigbits[0] = __set->__sigbits[1] =
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__set->__sigbits[2] = __set->__sigbits[3] = 0L;
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return 0;
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}
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_EXTERN_INLINE int
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__sigfillset (__sigset_t *__set)
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{
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/* SVR4 has a system call for `sigfillset' (!), and it only sets the bits
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for signals [1,31]. Setting bits for unimplemented signals seems
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harmless (and we will find out if it really is). */
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__set->__sigbits[0] = __set->__sigbits[1] =
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__set->__sigbits[2] = __set->__sigbits[3] = ~0L;
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return 0;
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}
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_EXTERN_INLINE int
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__sigaddset (__sigset_t *__set, int __sig)
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{
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__set->__sigbits[__SSELT (__sig)] |= __SSMASK (__sig);
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return 0;
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}
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_EXTERN_INLINE int
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__sigdelset (__sigset_t *__set, int __sig)
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{
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__set->__sigbits[__SSELT (__sig)] &= ~__SSMASK (__sig);
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return 0;
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}
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_EXTERN_INLINE int
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__sigismember (__const __sigset_t *__set, int __sig)
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{
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if (__set->__sigbits[__SSELT (__sig)] & __SSMASK (__sig))
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return 1;
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return 0;
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}
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#endif /* ! _SIGSET_H_fns */
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