sysdeps/generic/sigsetops.h

   1 /* __sigset_t manipulators.  Generic/BSD 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 SIG only.  The cast to `sigset_t' avoids
  25    overflow if `sigset_t' is wider than `int'.  */
  26 # define __sigmask(sig) (((__sigset_t) 1) << ((sig) - 1))
  27
  28 #define __sigemptyset(set)                      \
  29   (__extension__ ({                             \
  30     *(set) = (__sigset_t) 0;                    \
  31     0;                                          \
  32   }))
  33 #define __sigfillset(set)                       \
  34   (__extension__ ({                             \
  35     *(set) = ~(__sigset_t) 0;                   \
  36     0;                                          \
  37   }))
  38
  39 # define __sigisemptyset(set)                   \
  40   (*(set) == (__sigset_t) 0)
  41
  42 # define __sigandset(dest, left, right)         \
  43   (__extension__ ({                             \
  44     *(dest) = *(left) & *(right);               \
  45     0;                                          \
  46   }))
  47
  48 # define __sigorset(dest, left, right)          \
  49   (__extension__ ({                             \
  50     *(dest) = *(left) | *(right);               \
  51     0;                                          \
  52   }))
  53
  54 /* These macros needn't check for a bogus signal number;
  55    checking is done in the non-__ versions.  */
  56 # define __sigismember(set, sig)                \
  57   (__extension__ ({                             \
  58     __sigset_t __mask = __sigmask (sig);        \
  59     *(set) & __mask ? 1 : 0;                    \
  60   }))
  61
  62 # define __sigaddset(set, sig)                  \
  63   (__extension__ ({                             \
  64     __sigset_t __mask = __sigmask (sig);        \
  65     *(set) |= __mask;                           \
  66     0;                                          \
  67   }))
  68
  69 # define __sigdelset(set, sig)                  \
  70   (__extension__ ({                             \
  71     __sigset_t __mask = __sigmask (sig);        \
  72     *(set) &= ~__mask;                          \
  73     0;                                          \
  74   }))
  75
  76 #endif