sysdeps/generic/sigset-cvt-mask.h

   1 /* Convert between lowlevel sigmask and libc representation of sigset_t.
   2    Generic version.
   3    Copyright (C) 1998, 2002 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Contributed by Joe Keane <jgk@jgk.org>.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, write to the Free
  19    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  20    02111-1307 USA.  */
  21
  22 /* Convert between an old-style 32-bit signal mask and a POSIX sigset_t.  */
  23
  24 /* Perform *SET = MASK.  Unused bits of *SET are set to 0.
  25    Returns zero for success or -1 for errors (from sigaddset/sigemptyset).  */
  26 static inline int __attribute__ ((unused))
  27 sigset_set_old_mask (sigset_t *set, int mask)
  28 {
  29   if (sizeof (__sigset_t) == sizeof (unsigned int))
  30     *set = (unsigned int) mask;
  31   else
  32     {
  33       register unsigned int __sig;
  34
  35       if (__sigemptyset (set) < 0)
  36         return -1;
  37
  38       for (__sig = 1; __sig < NSIG && __sig <= sizeof (mask) * 8; __sig++)
  39         if (mask & sigmask (__sig))
  40           if (__sigaddset (set, __sig) < 0)
  41             return -1;
  42     }
  43   return 0;
  44 }
  45
  46 /* Return the sigmask corresponding to *SET.
  47    Unused bits of *SET are thrown away.  */
  48 static inline int __attribute__ ((unused))
  49 sigset_get_old_mask (const sigset_t *set)
  50 {
  51   if (sizeof (sigset_t) == sizeof (unsigned int))
  52     return (unsigned int) *set;
  53   else
  54     {
  55       unsigned int mask = 0;
  56       register unsigned int sig;
  57
  58       for (sig = 1; sig < NSIG && sig <= sizeof (mask) * 8; sig++)
  59         if (__sigismember (set, sig))
  60           mask |= sigmask (sig);
  61
  62       return mask;
  63     }
  64 }