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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <sysdep.h>
  22 #include <signal.h>
  23
  24 /* When there is kernel support for more than 64 signals, we'll have to
  25    switch to a new system call convention here.  */
  26
  27 int
  28 __sigprocmask (int how, const sigset_t *set, sigset_t *oset)
  29 {
  30   unsigned long int setval;
  31   long result;
  32
  33   if (set)
  34     setval = set->__val[0];
  35   else
  36     {
  37       setval = 0;
  38       how = SIG_BLOCK;  /* ensure blocked mask doesn't get changed */
  39     }
  40
  41   result = INLINE_SYSCALL (osf_sigprocmask, 2, how, setval);
  42   if (result == -1)
  43     /* If there are ever more than 63 signals, we need to recode this
  44        in assembler since we wouldn't be able to distinguish a mask of
  45        all 1s from -1, but for now, we're doing just fine... */
  46     return result;
  47
  48   if (oset)
  49     {
  50       oset->__val[0] = result;
  51       result = _SIGSET_NWORDS;
  52       while (--result > 0)
  53         oset->__val[result] = 0;
  54     }
  55   return 0;
  56 }
  57
  58 weak_alias (__sigprocmask, sigprocmask);