Kernel Utility Interface Summary

Appendix B

Use the following kernel utilities to develop and maintain drivers.

Table B-1 Kernel Utility Interfaces

Routine	Description
`adjmsg`(9F)	Trim bytes in a message
`allocb`(9F)	Allocate a message block
`backq`(9F)	Get pointer to the queue behind a given queue
`bcanput`(9F)	Test for flow control in a given priority band
`bufcall`(9F)	Recover from failure of `allocballocb`(9F)
`canput`(9F)	Test for room in a queue
`copymsg`(9F)	Copy a message
`datamsg`(9F)	Test whether message is a data message
`dupb`(9F)	Test whether thread can receive user-level signal
`dupb`(9F)	Duplicate a message block descriptor
`dupmsg`(9F)	Duplicate a message
`enableok`(9F)	Re-allow a queue to be scheduled for service
`esballoc`(9F)	Allocate message and data blocks
`flushband`(9F)	Flush messages in a given priority band
`flushq`(9F)	Flush a queue
`freeb`(9F)	Free a message block
`freemsg`(9F)	Free all message blocks in a message
`freezestr`(9F)	Disable changes to the state of the stream
`getq`(9F)	Get a message from a queue
`insq`(9F)	Put a message at a specific place in a queue
`linkb`(9F)	Concatenate two messages into one
`msgdsize`(9F)	Get the number of data bytes in a message
`noenable`(9F)	Prevent a queue from being scheduled
`OTHERQ`(9F)	Get pointer to the queue's partner queue
`pullupmsg`(9F)	Concatenate and align bytes in a message
`putbq`(9F)	Return a message to the beginning of a queue
`putctl`(9F)	Put a control message
`putctl1`(9F)	Put a control message with a one-byte parameter
`putnext`(9F)	Put a message to the next `queue`
`putq`(9F)	Put a message on a queue
`qbufcall`(9F)	Call a function when a buffer becomes available
`qprocsoff`(9F)	Turn off queue processing
`qprocson`(9F)	Turn on queue processing
`qreply`(9F)	Send a message on a stream in the reverse direction
`qsize`(9F)	Find the number of messages on a queue
`qtimeout`(9F)	Execute a function after a specified length of time
`qunbufcall`(9F)	Cancel a pending `qbufcall` request
`quntimeout`(9F)	Cancel a pending `qtimeout` request
`qwait`(9F)	Perimeter wait routine
`qwait_sig`(9F)	Perimeter wait routine
`qwriter`(9F)	Asynchronous perimeter upgrade
`RD`(9F)	Get pointer to the read queue
`rmvb`(9F)	Remove a message block from a message
`rmvq`(9F)	Remove a message from a queue
`strlog`(9F)	Submit messages for logging
`strqget`(9F)	Obtain information on a queue or a band of the queue
`strqset`(9F)	Change information on a queue or a band of the queue
`testb`(9F)	Check for an available buffer
`testb`(9F)	Cancel `bufcall` request
`unfreezestr`(9F)	Enable changes to the state of the stream
`unlinkb`(9F)	Remove a message block from the head of a message
`WR`(9F)	Get pointer to the write queue

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