putnextctl2 - send a control message with two single-byte parameters to a queue
#include <sys/stream.h> int putnextctl2(queue_t *q, int type, int p1, int p2);
Queue to which the message is to be sent.
Type of message.
First single-byte parameter.
Second single-byte parameter.
Architecture independent level 1 (DDI/DKI).
The putnextctl2() 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 p1 and p2 parameters can be used, for example, to indicate both read and write error codes when an M_ERROR message is being sent. putnextctl2() fails, if type is M_DATA, M_PROTO, or M_PCPROTO, or if a message block cannot be allocated. If successful, putnextctl2() calls the put(9E) routine of the queue pointed to by q with the newly allocated and initialized message.
On success, 1 is returned. 0 is returned if type is a data type, or if a message block cannot be allocated.
The putnextctl2() function can be called from user, interrupt, or kernel context.
The write_err() routine is used to set a write error condition at the STREAM head. Any existing read error condition is unaffected.
void
send_ctl(wrq, err)
queue_t *wrq;
uchar_t err;
{
(void) putnextctl2(wrq, M_ERROR, NOERROR, err);
}
put(9E), putnextctl1(9F), allocb(9F), datamsg(9F), putctl1(9F), putnextctl(9F)