Example #1
0
/*! Send signal to target thread */
int ksignal_queue ( kthread_t *kthread, siginfo_t *sig )
{
	int enqueue = FALSE;
	int retval = EXIT_SUCCESS;
	int schedule = FALSE;
	ksignal_handling_t *sh;
	sigaction_t *act;
	void (*func) (kthread_t *, void *), *param;
	kprocess_t *proc;
	siginfo_t *us;
	param_t param1, param2, param3;

	ASSERT ( kthread );
	ASSERT ( kthread_check_kthread ( kthread ) );
	ASSERT ( sig->si_signo > 0 && sig->si_signo <= SIGMAX );

	if ( !kthread_is_alive ( kthread ) )
		return ESRCH;

	sh = kthread_get_sigparams ( kthread );

	/* is thread suspended and waits for this signal? */
	if (
		kthread_is_suspended ( kthread, (void **) &func, &param ) &&
		((void *) func) == ((void *) ksignal_received_signal)
	)
	{
		/* thread is waiting for signal */
		if ( !ksignal_received_signal ( kthread, sig ) )
		{
			/* waited for this signal */

			/* do not process this signal further */
			return EXIT_SUCCESS;
		}
	}

	/*
	 * If thread is in interruptable state and signal is not masked:
	 * - process signal
	 * - otherwise queue it
	 */
	if (
		kthread_get_interruptable ( kthread ) &&
		!sigtestset ( sh->mask, sig->si_signo )
	)
	{
		act = &sh->act[sig->si_signo];

		if ( act->sa_flags != SA_SIGINFO )
			return ENOTSUP; /* not supported without SA_SIGINFO! */

		if ( 	act->sa_sigaction == SIG_ERR ||
			act->sa_sigaction == SIG_DFL ||
			act->sa_sigaction == SIG_IGN ||
			act->sa_sigaction == SIG_HOLD	)
		{
			return ENOTSUP; /* not yet supported */
		}

		if ( !kthread_is_ready ( kthread ) )
		{
			/*
			 * thread is suspended/blocked on something else
			 *
			 * 1. handle interruption:
			 *    a) we break suspend/wait state
			 *       (call cancel function)
			 *    b) set errno = EINTR
			 *    c) set return value = FAILURE
			 * 2. create new thread state
			 *    a) process signal in this state
			 */
			void (*func) (kthread_t *, void *), *param;
			kthread_is_suspended (kthread, (void **) &func, &param);

			if ( func )
				func ( kthread, param );

			kthread_move_to_ready ( kthread, LAST );
			kthread_set_errno ( kthread, EINTR );
			kthread_set_syscall_retval ( kthread, EXIT_FAILURE );

			/* thread is unsuspended, but signal
			 * handler will be added first */
			schedule = TRUE;
		}

		/* copy sig to user space */
		proc = kthread_get_process ( kthread );
		us = kprocess_stack_alloc ( proc );
		ASSERT (us);
		/*if ( !us )
			return ENOMEM;*/

		*us = *sig;

		kthread_create_new_state ( kthread, act->sa_sigaction,
					   K2U_GET_ADR ( us, proc ), NULL,
					   HANDLER_STACK_SIZE, TRUE );

		param1.p_ptr = proc;
		param2.p_ptr = us;
		param3.p_ptr = NULL;
		kthread_add_cleanup ( kthread, kprocess_stack_free,
				      param1, param2, param3 );

		/* mask signal in thread mask */
		sigaddset ( sh->mask, sig->si_signo );
		/* mask additional signals in thread mask */
		sigaddsets ( sh->mask, &act->sa_mask );
	}
	else {
		enqueue = TRUE;
	}

	if ( enqueue )
	{
		ksignal_add_to_pending ( sh, sig );

		retval = EAGAIN;
	}

	if ( schedule )
		kthreads_schedule ();

	return retval;
}
Example #2
0
/*! Send signal to target thread */
int ksignal_queue ( kthread_t *kthread, siginfo_t *sig )
{
	int enqueue = FALSE;
	int retval = EXIT_SUCCESS;
	int schedule = FALSE;
	ksignal_handling_t *sh;
	sigaction_t *act;
	void (*func) (kthread_t *, void *), *param;
	kprocess_t *proc;
	siginfo_t *us;
	param_t param1, param2, param3;
	ksiginfo_t *ksig;

	ASSERT ( kthread );
	ASSERT ( kthread_check_kthread ( kthread ) );
	ASSERT ( sig->si_signo > 0 && sig->si_signo <= SIGMAX );

	if ( !kthread_is_alive ( kthread ) )
		return ESRCH;

	sh = kthread_get_sigparams ( kthread );

	/* is thread suspended and waits for this signal? */
	if ( kthread_is_suspended ( kthread, (void **) &func, &param ) )
	{
		if ( ((void *) func) == ((void *) ksignal_received_signal) )
		{
			/* thread is waiting for signal */
			if ( !ksignal_received_signal ( kthread, sig ) )
			{
				/* waited for this signal */
				/* should continue with signal handler also? */

				/* do not process this signal further */
				return EXIT_SUCCESS;
			}

		}
		/* else {
		 *	thread is waiting for something else;
		 * 	deal with this later (in next "if")
		 * } */
	}

	/* if signal is not masked in thread signal mask, deliver signal */
	if ( !sigtestset ( sh->mask, sig->si_signo ) )
	{
		act = &sh->act[sig->si_signo];

		if ( act->sa_flags != SA_SIGINFO )
			return ENOTSUP; /* not supported without SA_SIGINFO! */

		if ( 	act->sa_sigaction == SIG_ERR ||
			act->sa_sigaction == SIG_DFL ||
			act->sa_sigaction == SIG_IGN ||
			act->sa_sigaction == SIG_HOLD	)
		{
			return ENOTSUP; /* not yet supported */
		}

		/* current implementation
			* - if thread is active or ready
			* -- save old context in list
			* -- create new context
			* - else
			* -- enqueue signal or cancel wait state (todo)
			*
			* on sys__exit check if its handler or thread!!!
			*/

		if ( !kthread_is_ready ( kthread ) )
		{
			void (*func) (kthread_t *, void *), *param;
			if ( kthread_is_suspended ( kthread,
						    (void **) &func, &param ) )
			{
				/*
					* thread is suspended on something
					* else; interrupt it or not?
					*
					* -handle interruption (kernel part)
					* -interrupt it (resume)
					* -process signal
					*
					* to do above just move thread to
					* ready, set errno & retval
					*/
				if ( func )
					func ( kthread, param );

				kthread_move_to_ready ( kthread, LAST );
				kthread_set_errno ( kthread, EINTR );
				kthread_set_syscall_retval(kthread,EXIT_FAILURE);

				/* thread is unsuspended, but signal
				 * handler will be added first */
				schedule = TRUE;
			}
			else {
				/* what else? this is error */
				ASSERT ( FALSE );
			}
		}

		/* copy sig to user space */
		proc = kthread_get_process ( kthread );
		us = ffs_alloc(proc->stack_pool, sizeof (siginfo_t));
		ASSERT (us);
		/*if ( !us )
			return ENOMEM;*/

		*us = *sig;

		kthread_create_new_state ( kthread, act->sa_sigaction,
					   K2U_GET_ADR ( us, proc ), NULL,
					   HANDLER_STACK_SIZE, TRUE );

		param1.p_ptr = proc->stack_pool;
		param2.p_ptr = us;
		param3.p_ptr = NULL;
		kthread_add_cleanup ( kthread, kthread_param_free,
				      param1, param2, param3 );

		/* mask signal in thread mask */
		sigaddset ( sh->mask, sig->si_signo );
		/* mask additional signals in thread mask */
		sigaddsets ( sh->mask, &act->sa_mask );
	}
	else {
		enqueue = TRUE;
	}

	if ( enqueue )
	{
		/* mask signal in thread mask */
		sigaddset ( sh->mask, sig->si_signo );

		/* add signal to list of pending signals */
		ksig = kmalloc ( sizeof (ksiginfo_t) );
		ksig->siginfo = *sig;

		list_append ( &sh->pending_signals, ksig, &ksig->list );
		/* list_sort_add ( &sh->pending_signals, ksig, &ksig->list,
				ksignal_compare ); */
		retval = EAGAIN;
	}

	if ( schedule )
		kthreads_schedule ();

	return retval;
}