sysdeps/generic/sigset.h

   1 /* __sig_atomic_t, __sigset_t, and related definitions.  Generic/BSD version.
   2    Copyright (C) 1991, 1992, 1994, 1996, 1997 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 Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    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    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #ifndef _SIGSET_H_types
  21 #define _SIGSET_H_types 1
  22
  23 typedef int __sig_atomic_t;
  24
  25 /* A `sigset_t' has a bit for each signal.  */
  26 typedef unsigned long int __sigset_t;
  27
  28 #endif
  29
  30
  31 /* We only want to define these functions if <signal.h> was actually
  32    included; otherwise we were included just to define the types.  Since we
  33    are namespace-clean, it wouldn't hurt to define extra macros.  But
  34    trouble can be caused by functions being defined (e.g., any global
  35    register vars declared later will cause compilation errors).  */
  36
  37 #if !defined (_SIGSET_H_fns) && defined (_SIGNAL_H)
  38 #define _SIGSET_H_fns 1
  39
  40 #ifndef _EXTERN_INLINE
  41 #define _EXTERN_INLINE extern __inline
  42 #endif
  43
  44 /* Return a mask that includes SIG only.  The cast to `sigset_t' avoids
  45    overflow if `sigset_t' is wider than `int'.  */
  46 #define __sigmask(sig)  (((__sigset_t) 1) << ((sig) - 1))
  47
  48 #define __sigemptyset(set)      ((*(set) = (__sigset_t) 0), 0)
  49 #define __sigfillset(set)       ((*(set) = ~(__sigset_t) 0), 0)
  50
  51 #ifdef _GNU_SOURCE
  52 # define __sigisemptyset(set)   (*(set) == (__sigset_t) 0)
  53 # define __sigandset(dest, left, right) \
  54                                 ((*(set) = (*(left) & *(right))), 0)
  55 # define __sigorset(dest, left, right) \
  56                                 ((*(set) = (*(left) | *(right))), 0)
  57 #endif
  58
  59 /* These functions needn't check for a bogus signal number -- error
  60    checking is done in the non __ versions.  */
  61
  62 extern int __sigismember (__const __sigset_t *, int);
  63 extern int __sigaddset (__sigset_t *, int);
  64 extern int __sigdelset (__sigset_t *, int);
  65
  66 #define __SIGSETFN(NAME, BODY, CONST)                                         \
  67   _EXTERN_INLINE int                                                          \
  68   NAME (CONST __sigset_t *__set, int __sig)                                   \
  69   {                                                                           \
  70     __sigset_t __mask = __sigmask (__sig);                                    \
  71     return BODY;                                                              \
  72   }
  73
  74 __SIGSETFN (__sigismember, (*__set & __mask) ? 1 : 0, __const)
  75 __SIGSETFN (__sigaddset, ((*__set |= __mask), 0), )
  76 __SIGSETFN (__sigdelset, ((*__set &= ~__mask), 0), )
  77
  78 #undef __SIGSETFN
  79
  80
  81 #endif /* ! _SIGSET_H_fns.  */