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)
