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streamio(7I) Ioctl Requests SunOS 5.5

EINVAL One of the following: ﬁldes in the strfdinsert structure

is not a valid, open stream ﬁle descriptor; the size of a

pointer plus offset is greater than the len ﬁeld for the

buffer speciﬁed through ctlptr; offset does not specify

a properly-aligned location in the data buffer; an

undeﬁned value is stored in ﬂags.

ENXIO Hangup received on ﬁldes of the ioctl call or ﬁldes in

the strfdinsert structure.

ERANGE The len ﬁeld for the buffer speciﬁed through databuf

does not fall within the range speciﬁed by the max-

imum and minimum packet sizes of the topmost

stream module, or the len ﬁeld for the buffer speciﬁed

through databuf is larger than the maximum

conﬁgured size of the data part of a message, or the len

ﬁeld for the buffer speciﬁed through ctlbuf is larger

than the maximum conﬁgured size of the control part

of a message.

I_FDINSERT can also fail if an error message was received by the stream

head of the stream corresponding to ﬁldes in the strfdinsert structure.

In this case, errno will be set to the value in the message.

I_STR Constructs an internalSTREAMS ioctl message from the data pointed to

by arg, and sends that message downstream.

This mechanism is provided to send user ioctl requests to downstream

modules and drivers. It allows information to be sent with the ioctl, and

will return to the user any information sent upstream by the down-

stream recipient. I_STR blocks until the system responds with either a

positive or negative acknowledgement message, or until the request

"times out" after some period of time. If the request times out, it fails

with errno set toETIME.

At most one I_STR can be active on a stream. Further I_STR calls will

block until the active I_STR completes at the stream head. The default

timeout interval for these requests is 15 seconds. The O_NDELAY and

O_NONBLOCK (see open(2)) ﬂags have no effect on this call.

7I-332 modiﬁed 24 Jan 1995

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Adaptec AHA-1520A Wartungshandbuch Seite 336