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

   1 /* Copyright (C) 1997-2014 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 #include <kernel-features.h>
  27
  28 #define SA_RESTORER     0x04000000
  29
  30 /* The difference here is that the sigaction structure used in the
  31    kernel is not the same as we use in the libc.  Therefore we must
  32    translate it here.  */
  33 #include <kernel_sigaction.h>
  34
  35 int
  36 __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
  37 {
  38   int result;
  39   struct kernel_sigaction kact;
  40   struct kernel_sigaction koact;
  41
  42   if (act)
  43     {
  44       kact.k_sa_handler = act->sa_handler;
  45       memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t));
  46       kact.sa_flags = act->sa_flags;
  47 #ifdef HAVE_SA_RESTORER
  48       if (kact.sa_flags & SA_RESTORER)
  49         kact.sa_restorer = act->sa_restorer;
  50 #endif
  51     }
  52
  53   result = INLINE_SYSCALL (rt_sigaction, 4, sig,
  54                            act ? &kact : NULL,
  55                            oact ? &koact : NULL, _NSIG / 8);
  56   if (result >= 0 || errno != ENOSYS)
  57     {
  58       if (oact && result >= 0)
  59         {
  60           oact->sa_handler = koact.k_sa_handler;
  61           memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t));
  62           oact->sa_flags = koact.sa_flags;
  63 #ifdef HAVE_SA_RESTORER
  64           oact->sa_restorer = koact.sa_restorer;
  65 #endif
  66         }
  67     }
  68   return result;
  69 }
  70 libc_hidden_def (__libc_sigaction)
  71
  72 #ifdef WRAPPER_INCLUDE
  73 # include WRAPPER_INCLUDE
  74 #endif
  75
  76 #ifndef LIBC_SIGACTION
  77 weak_alias (__libc_sigaction, __sigaction)
  78 libc_hidden_weak (__sigaction)
  79 weak_alias (__libc_sigaction, sigaction)
  80 #endif