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glibc  2.9
sigset-cvt-mask.h
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00001 /* Convert between lowlevel sigmask and libc representation of sigset_t.
00002    Generic version.
00003    Copyright (C) 1998, 2002 Free Software Foundation, Inc.
00004    This file is part of the GNU C Library.
00005    Contributed by Joe Keane <jgk@jgk.org>.
00006 
00007    The GNU C Library is free software; you can redistribute it and/or
00008    modify it under the terms of the GNU Lesser General Public
00009    License as published by the Free Software Foundation; either
00010    version 2.1 of the License, or (at your option) any later version.
00011 
00012    The GNU C Library is distributed in the hope that it will be useful,
00013    but WITHOUT ANY WARRANTY; without even the implied warranty of
00014    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015    Lesser General Public License for more details.
00016 
00017    You should have received a copy of the GNU Lesser General Public
00018    License along with the GNU C Library; if not, write to the Free
00019    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00020    02111-1307 USA.  */
00021 
00022 /* Convert between an old-style 32-bit signal mask and a POSIX sigset_t.  */
00023 
00024 /* Perform *SET = MASK.  Unused bits of *SET are set to 0.
00025    Returns zero for success or -1 for errors (from sigaddset/sigemptyset).  */
00026 static inline int __attribute__ ((unused))
00027 sigset_set_old_mask (sigset_t *set, int mask)
00028 {
00029   if (sizeof (__sigset_t) == sizeof (unsigned int))
00030     *set = (unsigned int) mask;
00031   else
00032     {
00033       register unsigned int __sig;
00034 
00035       if (__sigemptyset (set) < 0)
00036        return -1;
00037 
00038       for (__sig = 1; __sig < NSIG && __sig <= sizeof (mask) * 8; __sig++)
00039        if (mask & sigmask (__sig))
00040          if (__sigaddset (set, __sig) < 0)
00041            return -1;
00042     }
00043   return 0;
00044 }
00045 
00046 /* Return the sigmask corresponding to *SET.
00047    Unused bits of *SET are thrown away.  */
00048 static inline int __attribute__ ((unused))
00049 sigset_get_old_mask (const sigset_t *set)
00050 {
00051   if (sizeof (sigset_t) == sizeof (unsigned int))
00052     return (unsigned int) *set;
00053   else
00054     {
00055       unsigned int mask = 0;
00056       register unsigned int sig;
00057 
00058       for (sig = 1; sig < NSIG && sig <= sizeof (mask) * 8; sig++)
00059        if (__sigismember (set, sig))
00060          mask |= sigmask (sig);
00061 
00062       return mask;
00063     }
00064 }