1  /* __sigset_t manipulators.  Generic/BSD version.
       2     Copyright (C) 1991-2023 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     <https://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