bits/sigset.h

   1 /* __sig_atomic_t, __sigset_t, and related definitions.  Generic/BSD version.
   2    Copyright (C) 1991, 1992, 1994, 1996, 1997, 2007
   3    Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #ifndef _SIGSET_H_types
  22 #define _SIGSET_H_types 1
  23
  24 typedef int __sig_atomic_t;
  25
  26 /* A `sigset_t' has a bit for each signal.  */
  27 typedef unsigned long int __sigset_t;
  28
  29 #endif
  30
  31
  32 /* We only want to define these functions if <signal.h> was actually
  33    included; otherwise we were included just to define the types.  Since we
  34    are namespace-clean, it wouldn't hurt to define extra macros.  But
  35    trouble can be caused by functions being defined (e.g., any global
  36    register vars declared later will cause compilation errors).  */
  37
  38 #if !defined _SIGSET_H_fns && defined _SIGNAL_H
  39 #define _SIGSET_H_fns 1
  40
  41 #ifndef _EXTERN_INLINE
  42 # define _EXTERN_INLINE __extern_inline
  43 #endif
  44
  45 /* Return a mask that includes SIG only.  The cast to `sigset_t' avoids
  46    overflow if `sigset_t' is wider than `int'.  */
  47 #define __sigmask(sig)  (((__sigset_t) 1) << ((sig) - 1))
  48
  49 #define __sigemptyset(set)      ((*(set) = (__sigset_t) 0), 0)
  50 #define __sigfillset(set)       ((*(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                                 ((*(dest) = (*(left) & *(right))), 0)
  56 # define __sigorset(dest, left, right) \
  57                                 ((*(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.  */