putctl1(9F) Kernel Functions for Drivers putctl1(9F)NAMEputctl1 - 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 mes‐
sage 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 ALSOput(9E), allocb(9F), datamsg(9F), putctl(9F), putnextctl1(9F)
Writing Device Drivers
STREAMS Programming Guide
SunOS 5.11 16 Jan 2006 putctl1(9F)