1  /* Convert between lowlevel sigmask and libc representation of sigset_t.
       2     Generic version.
       3     Copyright (C) 1998-2023 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, see
      18     <https://www.gnu.org/licenses/>.  */
      19  
      20  /* Convert between an old-style 32-bit signal mask and a POSIX sigset_t.  */
      21  
      22  #include <sigsetops.h>
      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        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        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  }