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_LOOK

Retrieves the name of the module just below the stream head

Flushes all input or output queues

Flushes a band of messages

I_FIND

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

I_PEEK

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

I_SRDOPT

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

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_GETBAND

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

Enables the user to 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

Connects two streams

I_UNLINK

Disconnects two streams

Connects two streams with a persistent link below a multiplexing driver

I_PUNLINK

Disconnects two streams that have been connected with a persistent link