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/* __sig_atomic_t, __sigset_t, and related definitions. Generic/BSD version.
Copyright (C) 1991, 1992, 1994, 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 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 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 unsigned long int __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
/* Return a mask that includes SIG only. The cast to `sigset_t' avoids
overflow if `sigset_t' is wider than `int'. */
#define __sigmask(sig) (((__sigset_t) 1) << ((sig) - 1))
#define __sigemptyset(set) ((*(set) = (__sigset_t) 0), 0)
#define __sigfillset(set) ((*(set) = ~(__sigset_t) 0), 0)
/* These functions must check for a bogus signal number. We detect it by a
zero sigmask, since a number too low or too high will have shifted the 1
off the high end of the mask. If we find an error, we punt to a random
call we know fails with EINVAL (kludge city!), so as to avoid referring
to `errno' in this file (sigh). */
extern int __sigismember (__const __sigset_t *, int);
extern int __sigaddset (__sigset_t *, int);
extern int __sigdelset (__sigset_t *, int);
#ifndef _EXTERN_INLINE
#define _EXTERN_INLINE extern __inline
#endif
#define __SIGSETFN(NAME, BODY, CONST) \
_EXTERN_INLINE int \
__##NAME (CONST __sigset_t *__set, int __sig) \
{ \
if (__sig < 1 || __sig > (int) sizeof (__sigset_t) * 8) \
{ \
extern int raise (int); \
return raise (-1); \
} \
else \
{ \
__sigset_t __mask = __sigmask (__sig); \
return BODY; \
} \
}
__SIGSETFN (sigismember, (*__set & __mask) ? 1 : 0, __const)
__SIGSETFN (sigaddset, ((*__set |= __mask), 0), )
__SIGSETFN (sigdelset, ((*__set &= ~__mask), 0), )
#undef __SIGSETFN
#endif /* ! _SIGSET_H_fns. */
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