uclibc-ng/libc/sysdeps/linux/sparc/sigaction.c

/* POSIX.1 sigaction call for Linux/SPARC.
   Copyright (C) 1997-2000,2002,2003,2005 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Miguel de Icaza (miguel@nuclecu.unam.mx), 1997.

   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.

       Ported to uClibc from glibc: 090520:
               Jan Buchholz, KIP, Uni Heidelberg <jan.buchholz@kip.uni-heidelberg.de>
               Austin Foxley, Ceton Corporation <austinf@cetoncorp.com>
*/

#include <errno.h>
#include <signal.h>
#include <string.h>
#include <sys/syscall.h>
#include <bits/kernel_sigaction.h>


_syscall5(int, rt_sigaction, int, a, int, b, int, c, int, d, int, e);
static void __rt_sigreturn_stub (void);
static void __sigreturn_stub (void);

int
__libc_sigaction (int sig, __const struct sigaction *act, struct sigaction *oact)
{
    int ret;
	struct old_kernel_sigaction kact, koact;
    unsigned long stub = 0;
    int saved_errno = errno;
    
    if (act)
    {
        kact.k_sa_handler = act->sa_handler;
        memcpy (&kact.sa_mask, &act->sa_mask, sizeof(sigset_t));
        if (((kact.sa_flags = act->sa_flags) & SA_SIGINFO)!= 0)
            stub = (unsigned long) &__rt_sigreturn_stub;
        else
            stub = (unsigned long) &__sigreturn_stub;
        stub -= 8;
        kact.sa_restorer = NULL;
    }
    /* XXX The size argument hopefully will have to be changed to the real size of the user-level sigset_t.  */
    ret = rt_sigaction(sig, act ? &kact : NULL, oact ? &koact : NULL, stub, _NSIG / 8);

    if (ret >= 0 || errno != ENOSYS)
    {
        if (oact && ret >= 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 ret;
    }
    __set_errno (saved_errno);
    return -1;
}

#ifndef LIBC_SIGACTION
weak_alias(__libc_sigaction,sigaction)
libc_hidden_weak(sigaction)
#endif

static void
__rt_sigreturn_stub (void)
{
  __asm__ ("mov %0, %%g1\n\t"
          "ta  0x10\n\t"
          : /* no outputs */
          : "i" (__NR_rt_sigreturn));
}
static void
__sigreturn_stub (void)
{
  __asm__ ("mov %0, %%g1\n\t"
          "ta  0x10\n\t"
          : /* no outputs */
          : "i" (__NR_sigreturn));
}