glibc/bits/sigset.h

/* __sig_atomic_t, __sigset_t, and related definitions.  Generic/BSD version.
   Copyright (C) 1991-2016 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, see
   <http://www.gnu.org/licenses/>.  */

#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

#ifndef _EXTERN_INLINE
# define _EXTERN_INLINE __extern_inline
#endif

/* 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)	\
  (__extension__ ({ *(set) = (__sigset_t) 0; 0; })
#define	__sigfillset(set)	\
  (__extension__ ({ *(set) = ~(__sigset_t) 0; 0; }))

#ifdef _GNU_SOURCE
# define __sigisemptyset(set)	(*(set) == (__sigset_t) 0)
# define __sigandset(dest, left, right) \
  (__extension__ ({ *(dest) = *(left) & *(right); 0; }))
# define __sigorset(dest, left, right) \
  (__extension__ ({ *(dest) = *(left) | *(right); 0; }))
#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)				      \
  {									      \
    __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


#endif /* ! _SIGSET_H_fns.  */