Appendix B

Message Types



NAME

SYNOPSIS

DESCRIPTION

M_DATA Data message.
M_PROTO Protocol control message.
M_BREAK Control message used to generate a line break.
M_SIG Control messgae used to send a signal to processes.
M_DELAY Control message used to generate a real-time delay.
M_CTL Control message used between neighboring modules and drivers.
M_IOCTL Control message used to indicate a user ioctl(2) request.
M_SETOPTS Control message used to set stream head options.
M_IOCACK High priority control message used to indicate success of an ioctl request.
M_IOCNAK High priority control message used to indicate failure of an ioctl request.
M_PCPROTO High priority protocol control message.
M_PCSIG High priority control message used to send a signal to processes.
M_READ High priority control message used to indicate the occurence of a read(2) when there are no data on the stream head read queue.
M_FLUSH High priority control message used to inidicate that queues should be flushed.
M_STOP High priority control message used to indicate that output should be stopped immediately.
M_START High priority control message used to indicate that output can be restarted.
M_HANGUP High priority control message used to indicate that the device has been discon- nected.
M_ERROR High priority control message used to indicate that the stream has incurred a fatal error.
M_COPYIN High priority control message used during transparent ioctl processing to copy data from the user to a STREAMS message.
M_COPYOUT High priority control message used during transparent ioctl processing to copy data from a STREAMS message to the user.
M_IOCDATA High priority control message used during transparent ioctl processing to return the status and data of a previous M_COPYIN or M_COPYOUT request.
M_PCCTL High priority control message used between neighboring modules and drivers.
M_PCSETOPTS High priority control message used to set stream head options.
M_STOPI High priority control message used to indicate that input should be stopped immediately.
M_STARTI High priority control message used to indicate that input can be restarted.

SEE ALSO

Home

Contents Previous Chapter Next Chapter Index Glossary