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/* POSIX.1 sigaction call for Linux/SPARC.
Copyright (C) 1997, 1998 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <syscall.h>
#include <sys/signal.h>
#include <errno.h>
#include <kernel_sigaction.h>
extern int __syscall_rt_sigaction (int, const struct kernel_sigaction *,
struct kernel_sigaction *, unsigned long,
size_t);
static void __rt_sigreturn_stub (void);
static void __sigreturn_stub (void);
/* The variable is shared between all wrappers around signal handling
functions which have RT equivalents. */
int __libc_missing_rt_sigs;
int
__sigaction (int sig, __const struct sigaction *act, struct sigaction *oact)
{
struct old_kernel_sigaction k_sigact, k_osigact;
int ret;
/* First try the RT signals. */
if (!__libc_missing_rt_sigs)
{
struct 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 = __syscall_rt_sigaction (sig, act ? &kact : 0,
oact ? &koact : 0,
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);
__libc_missing_rt_sigs = 1;
}
/* Magic to tell the kernel we are using "new-style" signals, in that
the signal table is not kept in userspace. Not the same as the
really-new-style rt signals. */
sig = -sig;
if (act)
{
k_sigact.k_sa_handler = act->sa_handler;
k_sigact.sa_mask = act->sa_mask.__val[0];
k_sigact.sa_flags = act->sa_flags;
k_sigact.sa_restorer = NULL;
}
{
register int r_syscallnr __asm__("%g1") = __NR_sigaction;
register int r_sig __asm__("%o0") = sig;
register struct old_kernel_sigaction *r_act __asm__("%o1");
register struct old_kernel_sigaction *r_oact __asm__("%o2");
r_act = act ? &k_sigact : NULL;
r_oact = oact ? &k_osigact : NULL;
__asm__ __volatile__("t 0x10\n\t"
"bcc 1f\n\t"
" nop\n\t"
"sub %%g0,%%o0,%%o0\n"
"1:"
: "=r"(r_sig)
: "r"(r_syscallnr), "r"(r_act), "r"(r_oact),
"0"(r_sig));
ret = r_sig;
}
if (oact && ret >= 0)
{
oact->sa_handler = k_osigact.k_sa_handler;
oact->sa_mask.__val[0] = k_osigact.sa_mask;
oact->sa_flags = k_osigact.sa_flags;
oact->sa_restorer = NULL;
return ret;
}
__set_errno (-ret);
return -1;
}
weak_alias (__sigaction, sigaction);
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));
}
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