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Copyright (c) 2003, Sun Microsystems, Inc., All Rights Reserved
The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
B_TRUE
Copyright (c) 2003, Sun Microsystems, Inc., All Rights Reserved
The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
DDI_CAN_RECEIVE_SIG 9F "Dec 15, 2003"
NAME
ddi_can_receive_sig - Test for ability to receive signals
SYNOPSIS
#include <sys/ddi.h> #include <sys/sunddi.h> boolean_t ddi_can_receive_sig(void);
INTERFACE LEVEL
illumos DDI specific (illumos DDI).
PARAMETERS
None.
DESCRIPTION
The ddi_can_receive_sig() function returns a boolean value
indicating whether the current thread can receive signals sent by
kill(2). If the return value is B_FALSE, then the calling thread
cannot receive signals, and any call to qwait_sig(9F),
cv_wait_sig(9F), or cv_timedwait_sig(9F) implicitly becomes
qwait(9F), cv_wait(9F), or cv_timedwait(9F), respectively.
Drivers that can block indefinitely awaiting an event should use this function
to determine if additional means (such as timeout(9F)) may be necessary
to avoid creating unkillable threads.
RETURN VALUES
B_FALSE
The calling thread is in a state in which signals cannot be received. For example, the thread is not associated with a user process or is in the midst of exit(2) handling.
The calling thread may receive a signal while blocked on a condition variable. Note that this function does not check to determine whether signals are blocked (see sigprocmask(2)).
CONTEXT
The ddi_can_receive_sig() function may be called from user, kernel, or
interrupt context.
SEE ALSO
close (9E), cv_wait (9F), qwait (9F)