sysdeps/unix/sysv/linux/alpha/sigprocmask.c

   1 /* Copyright (C) 1993, 1995, 1997, 2003 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by David Mosberger (davidm@azstarnet.com).
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library.  If not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <sysdep.h>
  21 #include <signal.h>
  22
  23 /* When there is kernel support for more than 64 signals, we'll have to
  24    switch to a new system call convention here.  */
  25
  26 int
  27 __sigprocmask (int how, const sigset_t *set, sigset_t *oset)
  28 {
  29   unsigned long int setval;
  30   long result;
  31
  32   if (set)
  33     setval = set->__val[0];
  34   else
  35     {
  36       setval = 0;
  37       how = SIG_BLOCK;  /* ensure blocked mask doesn't get changed */
  38     }
  39
  40   result = INLINE_SYSCALL (osf_sigprocmask, 2, how, setval);
  41   if (result == -1)
  42     /* If there are ever more than 63 signals, we need to recode this
  43        in assembler since we wouldn't be able to distinguish a mask of
  44        all 1s from -1, but for now, we're doing just fine... */
  45     return result;
  46
  47   if (oset)
  48     {
  49       oset->__val[0] = result;
  50       result = _SIGSET_NWORDS;
  51       while (--result > 0)
  52         oset->__val[result] = 0;
  53     }
  54   return 0;
  55 }
  56
  57 weak_alias (__sigprocmask, sigprocmask);