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/* Copyright (C) 1997, 1998 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 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 <errno.h>
#include <signal.h>
#include <string.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>
extern int __syscall_sigaction (int, const struct old_kernel_sigaction *,
struct old_kernel_sigaction *);
extern int __syscall_rt_sigaction (int, const struct kernel_sigaction *,
struct kernel_sigaction *, size_t);
/* The variable is shared between all wrappers around signal handling
functions which have RT equivalents. */
int __libc_missing_rt_sigs;
/* 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
__sigaction (sig, act, oact)
int sig;
const struct sigaction *act;
struct sigaction *oact;
{
struct old_kernel_sigaction k_sigact, k_osigact;
int result;
/* First try the RT signals. */
if (!__libc_missing_rt_sigs)
{
struct kernel_sigaction kact, koact;
int saved_errno = errno;
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;
#ifdef HAVE_SA_RESTORER
kact.sa_restorer = act->sa_restorer;
#endif
}
/* XXX The size argument hopefully will have to be changed to the
real size of the user-level sigset_t. */
result = __syscall_rt_sigaction (sig, act ? &kact : 0,
oact ? &koact : 0, _NSIG / 8);
if (result >= 0 || errno != ENOSYS)
{
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;
#ifdef HAVE_SA_RESTORER
oact->sa_restorer = koact.sa_restorer;
#endif
}
return result;
}
__set_errno (saved_errno);
__libc_missing_rt_sigs = 1;
}
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;
#ifdef HAVE_SA_RESTORER
k_sigact.sa_restorer = act->sa_restorer;
#endif
}
result = __syscall_sigaction (sig, act ? &k_sigact : 0,
oact ? &k_osigact : 0);
if (oact && result >= 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;
#ifdef HAVE_SA_RESTORER
oact->sa_restorer = k_osigact.sa_restorer;
#endif
}
return result;
}
weak_alias (__sigaction, sigaction)
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