sysdeps/unix/sysv/linux/aarch64/sigaction.c

   1 /* Copyright (C) 1997-2015 Free Software Foundation, Inc.
   2
   3    This file is part of the GNU C Library.
   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 License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    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 <signal.h>
  21 #include <string.h>
  22
  23 #include <sysdep.h>
  24 #include <sys/syscall.h>
  25
  26 #define SA_RESTORER     0x04000000
  27
  28 /* The difference here is that the sigaction structure used in the
  29    kernel is not the same as we use in the libc.  Therefore we must
  30    translate it here.  */
  31 #include <kernel_sigaction.h>
  32
  33 int
  34 __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
  35 {
  36   int result;
  37   struct kernel_sigaction kact;
  38   struct kernel_sigaction koact;
  39
  40   if (act)
  41     {
  42       kact.k_sa_handler = act->sa_handler;
  43       memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t));
  44       kact.sa_flags = act->sa_flags;
  45 #ifdef HAVE_SA_RESTORER
  46       if (kact.sa_flags & SA_RESTORER)
  47         kact.sa_restorer = act->sa_restorer;
  48 #endif
  49     }
  50
  51   result = INLINE_SYSCALL (rt_sigaction, 4, sig,
  52                            act ? &kact : NULL,
  53                            oact ? &koact : NULL, _NSIG / 8);
  54   if (result >= 0 || errno != ENOSYS)
  55     {
  56       if (oact && result >= 0)
  57         {
  58           oact->sa_handler = koact.k_sa_handler;
  59           memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t));
  60           oact->sa_flags = koact.sa_flags;
  61 #ifdef HAVE_SA_RESTORER
  62           oact->sa_restorer = koact.sa_restorer;
  63 #endif
  64         }
  65     }
  66   return result;
  67 }
  68 libc_hidden_def (__libc_sigaction)
  69
  70 #include <nptl/sigaction.c>