sysdeps/generic/sigset-cvt-mask.h

   1 /* Convert between lowlevel sigmask and libc representation of sigset_t.
   2    Generic version.
   3    Copyright (C) 1998-2019 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, see
  19    <https://www.gnu.org/licenses/>.  */
  20
  21 /* Convert between an old-style 32-bit signal mask and a POSIX sigset_t.  */
  22
  23 #include <sigsetops.h>
  24
  25 /* Perform *SET = MASK.  Unused bits of *SET are set to 0.
  26    Returns zero for success or -1 for errors (from sigaddset/sigemptyset).  */
  27 static inline int __attribute__ ((unused))
  28 sigset_set_old_mask (sigset_t *set, int mask)
  29 {
  30   if (sizeof (__sigset_t) == sizeof (unsigned int))
  31     *set = (unsigned int) mask;
  32   else
  33     {
  34       unsigned int __sig;
  35
  36       if (__sigemptyset (set) < 0)
  37         return -1;
  38
  39       for (__sig = 1; __sig < NSIG && __sig <= sizeof (mask) * 8; __sig++)
  40         if (mask & sigmask (__sig))
  41           if (__sigaddset (set, __sig) < 0)
  42             return -1;
  43     }
  44   return 0;
  45 }
  46
  47 /* Return the sigmask corresponding to *SET.
  48    Unused bits of *SET are thrown away.  */
  49 static inline int __attribute__ ((unused))
  50 sigset_get_old_mask (const sigset_t *set)
  51 {
  52   if (sizeof (sigset_t) == sizeof (unsigned int))
  53     return (unsigned int) *set;
  54   else
  55     {
  56       unsigned int mask = 0;
  57       unsigned int sig;
  58
  59       for (sig = 1; sig < NSIG && sig <= sizeof (mask) * 8; sig++)
  60         if (__sigismember (set, sig))
  61           mask |= sigmask (sig);
  62
  63       return mask;
  64     }
  65 }