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/* __sig_atomic_t, __sigset_t, and related definitions. SVR4 version.
Copyright (C) 1994, 1995, 1996 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. */
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))
#ifdef __USE_EXTERN_INLINES
# 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] = ~0L;
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 /* use extern inlines. */
#endif /* ! _SIGSET_H_fns */
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