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79 lines
2.5 KiB
C
79 lines
2.5 KiB
C
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/* Copyright (C) 1994, 1995 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <mach/exc_server.h>
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#include <hurd/signal.h>
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/* Called by the microkernel when a thread gets an exception. */
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kern_return_t
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_S_catch_exception_raise (mach_port_t port,
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thread_t thread,
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task_t task,
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int exception,
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int code,
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int subcode)
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{
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int signo, error;
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long int sigcode;
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struct hurd_sigstate *ss;
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if (task != __mach_task_self ())
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/* The sender wasn't the kernel. */
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return EPERM;
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/* Call the machine-dependent function to translate the Mach exception
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codes into a signal number and subcode. */
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_hurd_exception2signal (exception, code, subcode,
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&signo, &sigcode, &error);
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/* Find the sigstate structure for the faulting thread. */
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__mutex_lock (&_hurd_siglock);
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for (ss = _hurd_sigstates; ss != NULL; ss = ss->next)
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if (ss->thread == thread)
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break;
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__mutex_unlock (&_hurd_siglock);
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if (ss == NULL)
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ss = _hurd_thread_sigstate (thread); /* Allocate a fresh one. */
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if (__spin_lock_locked (&ss->lock))
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{
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/* Loser. The thread faulted with its sigstate lock held. Its
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sigstate data is now suspect. So we reset the parts of it which
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could cause trouble for the signal thread. Anything else
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clobbered therein will just hose this user thread, but it's
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faulting already.
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This is almost certainly a library bug: unless random memory
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clobberation caused the sigstate lock to gratuitously appear held,
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no code should do anything that can fault while holding the
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sigstate lock. */
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ss->critical_section = 0;
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ss->context = NULL;
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__spin_unlock (&ss->lock);
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}
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/* Post the signal. */
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_hurd_internal_post_signal (ss, signo, sigcode, error,
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MACH_PORT_NULL, MACH_MSG_TYPE_PORT_SEND,
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0);
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return KERN_SUCCESS;
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}
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