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man pages section 9: DDI and DKI Kernel Functions

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Updated: Thursday, June 13, 2019
 
 

ddi_can_receive_sig(9F)

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

Solaris DDI specific (Solaris 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.

B_TRUE

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)