Adaptec AHA-1520A Manual de Serviço descarregar pdf (Página 332)

streamio(7I) Ioctl Requests SunOS 5.5

I_SETSIG Informs the stream head that the user wishes the kernel to issue the SIG-

POLL

signal (see signal(3C)) when a particular event has occurred on

the stream associated with ﬁldes. I_SETSIG supports an asynchronous

processing capability inSTREAMS. The value of arg is a bitmask that

speciﬁes the events for which the user should be signaled. It is the bit-

wise OR of any combination of the following constants:

S_INPUT Any message other than an M_PCPROTO has arrived

on a stream head read queue. This event is maintained

for compatibility with previous releases. This event is

triggered even if the message is of zero length.

S_RDNORM An ordinary (non-priority) message has arrived on a

stream head read queue. This event is triggered even if

the message is of zero length.

S_RDBAND A priority band message (band > 0) has arrived on a

stream head read queue. This event is triggered even if

the message is of zero length.

S_HIPRI A highpriority message is present on the stream head

read queue. This event is triggered evenif the message

is of zero length.

S_OUTPUT The write queue just below the stream head is no

longer full. This notiﬁes the user that there is room on

the queue for sending (or writing) data downstream.

S_WRNORM This event is the same as S_OUTPUT.

S_WRBAND A priority band greater than 0 of a queue downstream

exists and is writable. This notiﬁes the user that there

is room on the queue for sending (or writing) priority

data downstream.

S_MSG A STREAMS signal message that contains theSIGPOLL

signal has reached the front of the stream head read

queue.

S_ERROR An M_ERROR message has reached the stream head.

S_HANGUP AnM_HANGUP message has reached the stream head.

S_BANDURG When used in conjunction with S_RDBAND,SIGURG is

generated instead of SIGPOLL when a priority message

reaches the front of the stream head read queue.

A user process may choose to be signaled only of high priority messages

by setting the arg bitmask to the value S_HIPRI.

7I-328 modiﬁed 24 Jan 1995

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