kern_return_t
_S_catch_exception_raise (mach_port_t port,
thread_t thread,
task_t task,
int exception,
int code,
int subcode)
{
int signo, sigcode, error;
struct hurd_sigstate *ss;
if (task != __mach_task_self ())
/* The sender wasn't the kernel. */
return EPERM;
/* Call the machine-dependent function to translate the Mach exception
codes into a signal number and subcode. */
_hurd_exception2signal (exception, code, subcode,
&signo, &sigcode, &error);
/* 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.held))
/* Oops. The thread faulted with its sigstate lock held.
Bad scene. What to do? */
; /* XXX */
else
__mutex_lock (&ss->lock);
/* Post the signal. */
_hurd_internal_post_signal (ss, signo, sigcode, error,
MACH_PORT_NULL, MACH_MSG_TYPE_PORT_SEND);
return KERN_SUCCESS;
}
kern_return_t
_S_catch_exception_raise (mach_port_t port,
thread_t thread,
task_t task,
#ifdef EXC_MASK_ALL /* New interface flavor. */
exception_type_t exception,
exception_data_t code,
mach_msg_type_number_t codeCnt
#else /* Vanilla Mach 3.0 interface. */
integer_t exception,
integer_t code, integer_t subcode
#endif
)
{
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;
#ifdef EXC_MASK_ALL
assert (codeCnt >= 2);
d.exc_code = code[0];
d.exc_subcode = code[1];
#else
d.exc_code = code;
d.exc_subcode = subcode;
#endif
/* 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;
}
