PUTCTL1(9F) Kernel Functions for Drivers PUTCTL1(9F)

NAME

putctl1 - send a control message with a one-byte parameter to a queue

SYNOPSIS

#include <sys/stream.h>


int putctl1(queue_t *q, int type, int p);

INTERFACE LEVEL

Architecture independent level 1 (DDI/DKI).

PARAMETERS

q
Queue to which the message is to be sent.


type
Type of message.


p
One-byte parameter.

DESCRIPTION

The putctl1() function, like putctl(9F), tests the type argument to
make sure a data type has not been specified, and attempts to
allocate a message block. The p parameter can be used, for example,
to specify how long the delay will be when an M_DELAY message is
being sent. putctl1() fails if type is M_DATA, M_PROTO, or
M_PCPROTO, or if a message block cannot be allocated. If successful,
putctl1() calls the put(9E) routine of the queue pointed to by q with
the newly allocated and initialized message.

RETURN VALUES

On success, 1 is returned. 0 is returned if type is a data type, or
if a message block cannot be allocated.

CONTEXT

The putctl1() function can be called from user, interrupt, or kernel
context.

EXAMPLES

See the putctl(9F) function page for an example of putctl1().

SEE ALSO

put(9E), allocb(9F), datamsg(9F), putctl(9F), putnextctl1(9F)


Writing Device Drivers


STREAMS Programming Guide

January 16, 2006 PUTCTL1(9F)