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/* POSIX.1 `sigaction' call for Linux/i386.

   Copyright (C) 1991, 95, 96, 97, 98, 99, 2000 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

#include <errno.h>

#include <stddef.h>

#include <signal.h>

#include <string.h>

#include <machine/syscall.h>

/* The difference here is that the sigaction structure used in the

   kernel is not the same as we use in the libc.  Therefore we must

   translate it here.  */

#include <kernel_sigaction.h>

/* We do not globally define the SA_RESTORER flag so do it here.  */

#define SA_RESTORER 0x04000000

#define __NR___rt_sigaction __NR_rt_sigaction

static _syscall4(int,__rt_sigaction,int,sig,const struct kernel_sigaction *,act,

                 struct kernel_sigaction *,oact,size_t,size)

static void restore_rt (void) asm ("__restore_rt");

static void restore (void) asm ("__restore");

/* If ACT is not NULL, change the action for SIG to *ACT.

   If OACT is not NULL, put the old action for SIG in *OACT.  */

int

__libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)

{

  int result;

  struct kernel_sigaction kact, koact;

  if (act)

    {

      kact.k_sa_handler = act->sa_handler;

      memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t));

      kact.sa_flags = act->sa_flags | SA_RESTORER;

      kact.sa_restorer = ((act->sa_flags & SA_SIGINFO)

                          ? &restore_rt : &restore);

    }

  /* XXX The size argument hopefully will have to be changed to the

  real size of the user-level sigset_t.  */

  result = __rt_sigaction(sig, act ? (&kact) : NULL,

                          oact ? (&koact) : NULL, _NSIG / 8);

  if (oact && result >= 0)

    {

      oact->sa_handler = koact.k_sa_handler;

      memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t));

      oact->sa_flags = koact.sa_flags;

      oact->sa_restorer = koact.sa_restorer;

    }

  return result;

}

weak_alias (__libc_sigaction, __sigaction)

weak_alias (__libc_sigaction, sigaction)

/* NOTE: Please think twice before making any changes to the bits of

   code below.  GDB needs some intimate knowledge about it to

   recognize them as signal trampolines, and make backtraces through

   signal handlers work right.  Important are both the names

   (__restore and __restore_rt) and the exact instruction sequence.

   If you ever feel the need to make any changes, please notify the

   appropriate GDB maintainer.  */

#define RESTORE(name, syscall) RESTORE2 (name, syscall)

#define RESTORE2(name, syscall) \

asm                                             \

  (                                             \

   ".text\n"                                    \

   "    .align 16\n"                            \

   "__" #name ":\n"                             \

   "    movl $" #syscall ", %eax\n"             \

   "    int  $0x80"                             \

   );

/* The return code for realtime-signals.  */

RESTORE (restore_rt, __NR_rt_sigreturn)

/* For the boring old signals.  */

# undef RESTORE2

# define RESTORE2(name, syscall) \

asm                                             \

  (                                             \

   ".text\n"                                    \

   "    .align 8\n"                             \

   "__" #name ":\n"                             \

   "    popl %eax\n"                            \

   "    movl $" #syscall ", %eax\n"             \

   "    int  $0x80"                             \

   );

RESTORE (restore, __NR_sigreturn)