exc_server

Function - Handle kernel-reported thread exception.

SYNOPSIS

boolean_t	exc_server
		(mach_msg_header_t	request_msg,
		mach_msg_header_t	reply_ms);

PARAMETERS

in_msg

[pointer to in structure] The exception message received from the kernel.

out_msg

[out structure] A reply message.

DESCRIPTION

The exc_server function is the MIG generated server handling function to handle messages from the kernel relating to the occurrence of an exception in a thread. Such messages are delivered to the exception port set via thread_set_exception_ports or task_set_exception_ports. When an exception occurs in a thread, the thread sends an exception message to its exception port, blocking in the kernel waiting for the receipt of a reply. The exc_server function performs all necessary argument handling for this kernel message and calls catch_exception_raise, catch_exception_raise_state or catch_exception_raise_state_identity, which should handle the exception. If the called routine returns KERN_SUCCESS, a reply message will be sent, allowing the thread to continue from the point of the exception; otherwise, no reply message is sent and the called routine must have dealt with the exception thread directly.

RETURN VALUES

TRUE

The message was handled and the appropriate function was called.

FALSE

The message did not apply to the exception mechanism and no other action was taken.

RELATED INFORMATION

Functions: catch_exception_raise.