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streamio(7I) Ioctl Requests SunOS 5.5

I_PEEK returns 1 if a message was retrieved, and returns 0 if no message

was found on the stream head read queue. It does not wait for a mes-

sage to arrive. On return, ctlbuf speciﬁes information in the control

buffer, databuf speciﬁes information in the data buffer, and ﬂags con-

tains the valueRS_HIPRI or 0. On failure, errno is set to the following

value:

EFAULT arg points, or the buffer area speciﬁed in ctlbuf or data-

buf is, outside the allocated address space.

EBADMSG Queued message to be read is not valid for I_PEEK.

EINVAL Illegal value for ﬂags.

I_SRDOPT Sets the read mode (see read(2)) using the value of the argument arg.

Legal arg values are:

RNORM Byte-stream mode, the default.

RMSGD Message-discard mode.

RMSGN Message-nondiscard mode.

In addition, the stream head’s treatment of control messages may be

changed by setting the following ﬂags in arg:

RPROTNORM Reject read() with EBADMSG if a control message is at

the front of the stream head read queue.

RPROTDAT Deliver the control portion of a message as data when a

user issues read(). This is the default behavior.

RPROTDIS Discard the control portion of a message, delivering

any data portion, when a user issues a read().

On failure, errno is set to the following value:

EINVAL arg is not one of the above legal values.

I_GRDOPT Returns the current read mode setting in an int pointed to by the argu-

ment arg. Read modes are described in read(). On failure, errno is set

to the following value:

EFAULT arg points outside the allocated address space.

I_NREAD Counts the number of data bytes in data blocks in the ﬁrst message on

the stream head read queue, and places this value in the location

pointed to by arg. The return value for the command is the number of

messages on the stream head read queue. For example, if zero is

returned in arg, but the ioctl return value is greater thanzero, this indi-

cates that a zero-length message is next on the queue. On failure, errno

is set to the following value:

EFAULT arg points outside the allocated address space.

7I-330 modiﬁed 24 Jan 1995

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Adaptec AHA-1520A Manual de Serviço Página 334