libc/sysdeps/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 <features.h>
  20 #include <errno.h>
  21 #include <sys/syscall.h>
  22 #include <signal.h>
  23 #include <string.h>
  24
  25 /* When there is kernel support for more than 64 signals, we'll have to
  26    switch to a new system call convention here.  */
  27
  28 static __inline__ _syscall2(int, osf_sigprocmask, int, how, unsigned long int, setval)
  29
  30 int
  31 sigprocmask (int how, const sigset_t *set, sigset_t *oset)
  32 {
  33   unsigned long int setval;
  34   long result;
  35
  36   if (set)
  37     setval = set->__val[0];
  38   else
  39     {
  40       setval = 0;
  41       how = SIG_BLOCK;  /* ensure blocked mask doesn't get changed */
  42     }
  43
  44   result = osf_sigprocmask(how, setval);
  45   if (result == -1)
  46     /* If there are ever more than 64 signals, we need to recode this
  47        in assembler since we wouldn't be able to distinguish a mask of
  48        all 1s from -1, but for now, we're doing just fine... */
  49     return result;
  50
  51   if (oset)
  52     {
  53       if (_SIGSET_NWORDS == 2) /* typical */
  54         oset->__val[1] = 0;
  55       if (_SIGSET_NWORDS > 2)
  56         memset(oset, 0, sizeof(*oset));
  57       oset->__val[0] = result;
  58     }
  59   return 0;
  60 }
  61 libc_hidden_def(sigprocmask)