sysdeps/unix/sysv/linux/sigsetops.h

   1 /* __sigset_t manipulators.  Linux version.
   2    Copyright (C) 1991-2018 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _SIGSETOPS_H
  20 #define _SIGSETOPS_H 1
  21
  22 #include <signal.h>
  23
  24 /* Return a mask that includes the bit for SIG only.  */
  25 # define __sigmask(sig) \
  26   (((unsigned long int) 1) << (((sig) - 1) % (8 * sizeof (unsigned long int))))
  27
  28 /* Return the word index for SIG.  */
  29 # define __sigword(sig) (((sig) - 1) / (8 * sizeof (unsigned long int)))
  30
  31 # define __sigemptyset(set)                                     \
  32   (__extension__ ({                                             \
  33     int __cnt = _SIGSET_NWORDS;                                 \
  34     sigset_t *__set = (set);                                    \
  35     while (--__cnt >= 0)                                        \
  36       __set->__val[__cnt] = 0;                                  \
  37     (void)0;                                                    \
  38   }))
  39
  40 # define __sigfillset(set)                                      \
  41   (__extension__ ({                                             \
  42     int __cnt = _SIGSET_NWORDS;                                 \
  43     sigset_t *__set = (set);                                    \
  44     while (--__cnt >= 0)                                        \
  45       __set->__val[__cnt] = ~0UL;                               \
  46     (void)0;                                                    \
  47   }))
  48
  49 # define __sigisemptyset(set)                                   \
  50   (__extension__ ({                                             \
  51     int __cnt = _SIGSET_NWORDS;                                 \
  52     const sigset_t *__set = (set);                              \
  53     int __ret = __set->__val[--__cnt];                          \
  54     while (!__ret && --__cnt >= 0)                              \
  55       __ret = __set->__val[__cnt];                              \
  56     __ret == 0;                                                 \
  57   }))
  58
  59 # define __sigandset(dest, left, right)                         \
  60   (__extension__ ({                                             \
  61     int __cnt = _SIGSET_NWORDS;                                 \
  62     sigset_t *__dest = (dest);                                  \
  63     const sigset_t *__left = (left);                            \
  64     const sigset_t *__right = (right);                          \
  65     while (--__cnt >= 0)                                        \
  66       __dest->__val[__cnt] = (__left->__val[__cnt]              \
  67                               & __right->__val[__cnt]);         \
  68     (void)0;                                                    \
  69   }))
  70
  71 # define __sigorset(dest, left, right)                          \
  72   (__extension__ ({                                             \
  73     int __cnt = _SIGSET_NWORDS;                                 \
  74     sigset_t *__dest = (dest);                                  \
  75     const sigset_t *__left = (left);                            \
  76     const sigset_t *__right = (right);                          \
  77     while (--__cnt >= 0)                                        \
  78       __dest->__val[__cnt] = (__left->__val[__cnt]              \
  79                               | __right->__val[__cnt]);         \
  80     (void)0;                                                    \
  81   }))
  82
  83 /* These macros needn't check for a bogus signal number;
  84    error checking is done in the non-__ versions.  */
  85 # define __sigismember(set, sig)                                \
  86   (__extension__ ({                                             \
  87     unsigned long int __mask = __sigmask (sig);                 \
  88     unsigned long int __word = __sigword (sig);                 \
  89     (set)->__val[__word] & __mask ? 1 : 0;                      \
  90   }))
  91
  92 # define __sigaddset(set, sig)                                  \
  93   (__extension__ ({                                             \
  94     unsigned long int __mask = __sigmask (sig);                 \
  95     unsigned long int __word = __sigword (sig);                 \
  96     (set)->__val[__word] |= __mask;                             \
  97     (void)0;                                                    \
  98   }))
  99
 100 # define __sigdelset(set, sig)                                  \
 101   (__extension__ ({                                             \
 102     unsigned long int __mask = __sigmask (sig);                 \
 103     unsigned long int __word = __sigword (sig);                 \
 104     (set)->__val[__word] &= ~__mask;                            \
 105     (void)0;                                                    \
 106  }))
 107
 108 #endif /* bits/sigsetops.h */