82 lines
2.6 KiB
C
82 lines
2.6 KiB
C
/* Copyright (C) 1994, 1995, 1996, 1997 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 <mach/exc_server.h>
|
|
#include <hurd/signal.h>
|
|
|
|
/* Called by the microkernel when a thread gets an exception. */
|
|
|
|
kern_return_t
|
|
_S_catch_exception_raise (mach_port_t port,
|
|
thread_t thread,
|
|
task_t task,
|
|
int exception,
|
|
int code,
|
|
int subcode)
|
|
{
|
|
struct hurd_sigstate *ss;
|
|
int signo;
|
|
struct hurd_signal_detail d;
|
|
|
|
if (task != __mach_task_self ())
|
|
/* The sender wasn't the kernel. */
|
|
return EPERM;
|
|
|
|
d.exc = exception;
|
|
d.exc_code = code;
|
|
d.exc_subcode = subcode;
|
|
|
|
/* Call the machine-dependent function to translate the Mach exception
|
|
codes into a signal number and subcode. */
|
|
_hurd_exception2signal (&d, &signo);
|
|
|
|
/* Find the sigstate structure for the faulting thread. */
|
|
__mutex_lock (&_hurd_siglock);
|
|
for (ss = _hurd_sigstates; ss != NULL; ss = ss->next)
|
|
if (ss->thread == thread)
|
|
break;
|
|
__mutex_unlock (&_hurd_siglock);
|
|
if (ss == NULL)
|
|
ss = _hurd_thread_sigstate (thread); /* Allocate a fresh one. */
|
|
|
|
if (__spin_lock_locked (&ss->lock))
|
|
{
|
|
/* Loser. The thread faulted with its sigstate lock held. Its
|
|
sigstate data is now suspect. So we reset the parts of it which
|
|
could cause trouble for the signal thread. Anything else
|
|
clobbered therein will just hose this user thread, but it's
|
|
faulting already.
|
|
|
|
This is almost certainly a library bug: unless random memory
|
|
clobberation caused the sigstate lock to gratuitously appear held,
|
|
no code should do anything that can fault while holding the
|
|
sigstate lock. */
|
|
|
|
__spin_unlock (&ss->critical_section_lock);
|
|
ss->context = NULL;
|
|
__spin_unlock (&ss->lock);
|
|
}
|
|
|
|
/* Post the signal. */
|
|
_hurd_internal_post_signal (ss, signo, &d,
|
|
MACH_PORT_NULL, MACH_MSG_TYPE_PORT_SEND,
|
|
0);
|
|
|
|
return KERN_SUCCESS;
|
|
}
|