bits/sigset.h

   1 /* __sig_atomic_t, __sigset_t, and related definitions.  Generic/BSD version.
   2    Copyright (C) 1991-2016 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 _SIGSET_H_types
  20 #define _SIGSET_H_types 1
  21
  22 typedef int __sig_atomic_t;
  23
  24 /* A `sigset_t' has a bit for each signal.  */
  25 typedef unsigned long int __sigset_t;
  26
  27 #endif
  28
  29
  30 /* We only want to define these functions if <signal.h> was actually
  31    included; otherwise we were included just to define the types.  Since we
  32    are namespace-clean, it wouldn't hurt to define extra macros.  But
  33    trouble can be caused by functions being defined (e.g., any global
  34    register vars declared later will cause compilation errors).  */
  35
  36 #if !defined _SIGSET_H_fns && defined _SIGNAL_H
  37 #define _SIGSET_H_fns 1
  38
  39 #ifndef _EXTERN_INLINE
  40 # define _EXTERN_INLINE __extern_inline
  41 #endif
  42
  43 /* Return a mask that includes SIG only.  The cast to `sigset_t' avoids
  44    overflow if `sigset_t' is wider than `int'.  */
  45 #define __sigmask(sig)  (((__sigset_t) 1) << ((sig) - 1))
  46
  47 #define __sigemptyset(set)      \
  48   (__extension__ ({ *(set) = (__sigset_t) 0; 0; })
  49 #define __sigfillset(set)       \
  50   (__extension__ ({ *(set) = ~(__sigset_t) 0; 0; }))
  51
  52 #ifdef _GNU_SOURCE
  53 # define __sigisemptyset(set)   (*(set) == (__sigset_t) 0)
  54 # define __sigandset(dest, left, right) \
  55   (__extension__ ({ *(dest) = *(left) & *(right); 0; }))
  56 # define __sigorset(dest, left, right) \
  57   (__extension__ ({ *(dest) = *(left) | *(right); 0; }))
  58 #endif
  59
  60 /* These functions needn't check for a bogus signal number -- error
  61    checking is done in the non __ versions.  */
  62
  63 extern int __sigismember (const __sigset_t *, int);
  64 extern int __sigaddset (__sigset_t *, int);
  65 extern int __sigdelset (__sigset_t *, int);
  66
  67 #ifdef __USE_EXTERN_INLINES
  68 # define __SIGSETFN(NAME, BODY, CONST)                                        \
  69   _EXTERN_INLINE int                                                          \
  70   NAME (CONST __sigset_t *__set, int __sig)                                   \
  71   {                                                                           \
  72     __sigset_t __mask = __sigmask (__sig);                                    \
  73     return BODY;                                                              \
  74   }
  75
  76 __SIGSETFN (__sigismember, (*__set & __mask) ? 1 : 0, const)
  77 __SIGSETFN (__sigaddset, ((*__set |= __mask), 0), )
  78 __SIGSETFN (__sigdelset, ((*__set &= ~__mask), 0), )
  79
  80 # undef __SIGSETFN
  81 #endif
  82
  83
  84 #endif /* ! _SIGSET_H_fns.  */