sysdeps/unix/sysv/linux/sparc/sparc32/sigaction.c

   1 /* POSIX.1 sigaction call for Linux/SPARC.
   2    Copyright (C) 1997-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Miguel de Icaza <miguel@nuclecu.unam.mx>, 1997.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <string.h>
  21 #include <syscall.h>
  22 #include <sys/signal.h>
  23 #include <errno.h>
  24 #include <kernel_sigaction.h>
  25 #include <sysdep.h>
  26
  27 static void __rt_sigreturn_stub (void);
  28 static void __sigreturn_stub (void);
  29
  30 int
  31 __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
  32 {
  33   struct kernel_sigaction kact, koact;
  34   unsigned long stub = 0;
  35   int ret;
  36
  37   if (act)
  38     {
  39       kact.k_sa_handler = act->sa_handler;
  40       memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t));
  41       if (((kact.sa_flags = act->sa_flags) & SA_SIGINFO) != 0)
  42         stub = (unsigned long) &__rt_sigreturn_stub;
  43       else
  44         stub = (unsigned long) &__sigreturn_stub;
  45       stub -= 8;
  46       kact.sa_restorer = NULL;
  47     }
  48
  49   /* XXX The size argument hopefully will have to be changed to the
  50      real size of the user-level sigset_t.  */
  51   ret = INLINE_SYSCALL (rt_sigaction, 5, sig, act ? &kact : 0,
  52                         oact ? &koact : 0, stub, _NSIG / 8);
  53
  54   if (oact && ret >= 0)
  55     {
  56       oact->sa_handler = koact.k_sa_handler;
  57       memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t));
  58       oact->sa_flags = koact.sa_flags;
  59       oact->sa_restorer = koact.sa_restorer;
  60     }
  61   return ret;
  62 }
  63 libc_hidden_def (__libc_sigaction)
  64
  65 #ifdef WRAPPER_INCLUDE
  66 # include WRAPPER_INCLUDE
  67 #endif
  68
  69 #ifndef LIBC_SIGACTION
  70 weak_alias (__libc_sigaction, __sigaction);
  71 libc_hidden_weak (__sigaction)
  72 weak_alias (__libc_sigaction, sigaction);
  73 #endif
  74
  75 static void
  76 __rt_sigreturn_stub (void)
  77 {
  78   __asm__ ("mov %0, %%g1\n\t"
  79            "ta  0x10\n\t"
  80            : /* no outputs */
  81            : "i" (__NR_rt_sigreturn));
  82 }
  83
  84 static void
  85 __sigreturn_stub (void)
  86 {
  87   __asm__ ("mov %0, %%g1\n\t"
  88            "ta  0x10\n\t"
  89            : /* no outputs */
  90            : "i" (__NR_sigreturn));
  91 }