STREAMS Programming Guide

Other ioctl(2) Commands

streamio(7I) details the following ioctl(2) commands.

Table 4-2 Other ioctl(2) Commands

ioctl(2)

Description 

I_ANCHOR

Prevents the removal of a STREAMS module with an I_POP call. Any process can place an anchor on a stream, but once placed, an anchor can only be removed by a privileged process.

I_FLUSH

Retrieves the name of the module just below the stream head 

I_FLUSH

Flushes all input or output queues 

I_FLUSHBAND

Flushes a band of messages 

I_FIND

Compares the names of all modules present in the stream to a specific name 

I_PEEK

Lets the user look at information in the first message on the stream head read queue without taking the message off the queue  

I_STRDOPT

Sets the read mode using a series of flag options in the argument 

I_GRDOPT

Indicates the read mode in an int

I_NREAD

Counts the data bytes in data blocks in the first message on the stream head read queue 

I_FDINSERT

Creates a message from a user buffer, adds information about another stream, and sends the message downstream 

I_SWROPT

Sets the write mode using the value of the argument 

I_GWROPT

Returns the current write mode setting 

I_SENDFD

Requests that the stream send a message with file pointer to the stream head at the other end of a STREAMS pipe 

I_RECVFD

Retrieves the file descriptor of the message sent by an I_SENDFD ioctl(2) over a STREAMS pipe

I_ATMARK

Lets the application see if the current message on the stream head read queue is marked by a module downstream 

I_CKBAND

Checks if the message of a given priority band exists on the stream head read queue 

I_GETNBAND

Returns the priority band of the first message on the stream head read queue 

I_CANPUT

Checks if a certain band is writable 

I_SETCLTIME

Lets the user set the time the stream head will delay when a stream is closing if data exists on the write queues 

I_GETCLTIME

Returns the close time delay 

I_LINK

Connects two streams 

I_UNLINK

Disconnects two streams 

I_PLINK

Connects two streams with a persistent link below a multiplexing driver 

I_PUNLINK

Disconnects two streams that have been connected with a persistent link