Passes a control message with a one-byte parameter.
The putctl1 utility creates a control message of the type specified by the type parameter with a one-byte parameter specified by the param parameter, and calls the put procedure of the queue pointed to by the q parameter, with a pointer to the created message as an argument.
The putctl1 utility allocates new blocks by calling the allocb utility.
This utility is part of STREAMS Kernel Extensions.
| Item | Description |
|---|---|
| q | Specifies the queue. |
| type | Specifies the type of control message. |
| param | Specifies the one-byte parameter. |
On successful completion, the putctl1 utility returns a value of 1. It returns a value of 0 if it cannot allocate a message block, or if the value of the type parameter is M_DATA, M_PROTO, or M_PCPROTO. The M_DELAY type is allowed.