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/* Emulate sigstack function using sigalstack.
Copyright (C) 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
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 <signal.h>
int
sigstack (ss, oss)
const struct sigstack *ss;
struct sigstack *oss;
{
stack_t sas;
stack_t *sasp = NULL;
stack_t osas;
stack_t *osasp = oss == NULL ? NULL : &osas;
int result;
if (ss != NULL)
{
/* We have to convert the information. */
sas.ss_sp = ss->ss_sp;
sas.ss_flags = ss->ss_onstack ? SS_ONSTACK : 0;
/* For the size of the stack we have no value we can pass to the
kernel. This is why this function should not be used. We simply
assume that all the memory down to address zero (in case the stack
grows down) is available. */
sas.ss_size = ss->ss_sp - NULL;
sasp = &sas;
}
/* Call the kernel. */
result = __sigaltstack (sasp, osasp);
/* Convert the result, if wanted and possible. */
if (result == 0 && oss != NULL)
{
oss->ss_sp = osas.ss_sp;
oss->ss_onstack = (osas.ss_flags & SS_ONSTACK) != 0;
}
return result;
}
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