glibc/sysdeps/unix/sysv/linux/sigsetops.h

/* __sigset_t manipulators.  Linux version.
   Copyright (C) 1991-2017 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 _SIGSETOPS_H
#define _SIGSETOPS_H 1

#include <signal.h>

/* Return a mask that includes the bit for SIG only.  */
# define __sigmask(sig) \
  (((unsigned long int) 1) << (((sig) - 1) % (8 * sizeof (unsigned long int))))

/* Return the word index for SIG.  */
# define __sigword(sig) (((sig) - 1) / (8 * sizeof (unsigned long int)))

# define __sigemptyset(set)					\
  (__extension__ ({						\
    int __cnt = _SIGSET_NWORDS;					\
    sigset_t *__set = (set);					\
    while (--__cnt >= 0)					\
      __set->__val[__cnt] = 0;					\
    (void)0;							\
  }))

# define __sigfillset(set)					\
  (__extension__ ({						\
    int __cnt = _SIGSET_NWORDS;					\
    sigset_t *__set = (set);					\
    while (--__cnt >= 0)					\
      __set->__val[__cnt] = ~0UL;				\
    (void)0;							\
  }))

# define __sigisemptyset(set)					\
  (__extension__ ({						\
    int __cnt = _SIGSET_NWORDS;					\
    const sigset_t *__set = (set);				\
    int __ret = __set->__val[--__cnt];				\
    while (!__ret && --__cnt >= 0)				\
      __ret = __set->__val[__cnt];				\
    __ret == 0;							\
  }))

# define __sigandset(dest, left, right)				\
  (__extension__ ({						\
    int __cnt = _SIGSET_NWORDS;					\
    sigset_t *__dest = (dest);					\
    const sigset_t *__left = (left);				\
    const sigset_t *__right = (right);				\
    while (--__cnt >= 0)					\
      __dest->__val[__cnt] = (__left->__val[__cnt]		\
			      & __right->__val[__cnt]);		\
    (void)0;							\
  }))

# define __sigorset(dest, left, right)				\
  (__extension__ ({						\
    int __cnt = _SIGSET_NWORDS;					\
    sigset_t *__dest = (dest);					\
    const sigset_t *__left = (left);				\
    const sigset_t *__right = (right);				\
    while (--__cnt >= 0)					\
      __dest->__val[__cnt] = (__left->__val[__cnt]		\
			      | __right->__val[__cnt]);		\
    (void)0;							\
  }))

/* These macros needn't check for a bogus signal number;
   error checking is done in the non-__ versions.  */
# define __sigismember(set, sig)				\
  (__extension__ ({						\
    unsigned long int __mask = __sigmask (sig);			\
    unsigned long int __word = __sigword (sig);			\
    (set)->__val[__word] & __mask ? 1 : 0;			\
  }))

# define __sigaddset(set, sig)					\
  (__extension__ ({						\
    unsigned long int __mask = __sigmask (sig);			\
    unsigned long int __word = __sigword (sig);			\
    (set)->__val[__word] |= __mask;				\
    (void)0;							\
  }))

# define __sigdelset(set, sig)					\
  (__extension__ ({						\
    unsigned long int __mask = __sigmask (sig);			\
    unsigned long int __word = __sigword (sig);			\
    (set)->__val[__word] &= ~__mask;				\
    (void)0;							\
 }))

#endif /* bits/sigsetops.h */