streamio(7I) details the ioctl(2) commands shown in Table 4–2.
Table 4–2 Other ioctl Commands
ioctl Calls |
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_LOOK |
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 |
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 |
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_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 |
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 |