Parameter passing to function with void * as Argument Post: 302902929

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LEARN ABOUT OPENSOLARIS

putctl

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

NAME

       putctl - send a control message to a queue

SYNOPSIS

       #include <sys/stream.h>

       int putctl(queue_t *q, int type);

INTERFACE LEVEL

       Architecture independent level 1 (DDI/DKI).

PARAMETERS

       q       Queue to which the message is to be sent.

       type    Message type (must be control, not data type).

DESCRIPTION

       The  putctl()  function	tests  the  type argument to make sure a data type has not been specified, and then attempts to allocate a message
       block. putctl() fails if type is M_DATA, M_PROTO, or M_PCPROTO, or if a message block cannot be allocated. If successful,   putctl()  calls
       the put(9E) routine of the queue pointed to by q with the newly allocated and initialized messages.

RETURN VALUES

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

CONTEXT

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

EXAMPLES

       Example 1 Using putctl()

       The send_ctl() routine is used to pass control messages downstream. M_BREAK messages are handled with putctl() (line 11). putctl1(9F) (line
       16) is used for M_DELAY messages, so that parm can be used to specify the length of the delay. In either case, if a message block cannot be
       allocated  a  variable  recording  the number of allocation failures is incremented (lines 12, 17). If an invalid message type is detected,
       cmn_err(9F) panics the system (line 21).

	 1  void
	  2  send_ctl(wrq, type, parm)
	  3	 queue_t *wrq;
	  4	 uchar_t type;
	  5	 uchar_t parm;
	  6  {
	  7	    extern int num_alloc_fail;
	  8
	  9	  switch (type) {
	 10	    case M_BREAK:
	 11		if (!putctl(wrq->q_next, M_BREAK))
	 12			 num_alloc_fail++;
	 13		  break;
	 14
	 15	  case M_DELAY:
	 16		if (!putctl1(wrq->q_next, M_DELAY, parm))
	 17			 num_alloc_fail++;
	 18		break;
	 19
	 20	  default:
	 21		cmn_err(CE_PANIC, "send_ctl: bad message type passed");
	 22		  break;
	 23	    }
	 24  }

SEE ALSO

       put(9E), cmn_err(9F), datamsg(9F), putctl1(9F), putnextctl(9F)

       Writing Device Drivers

       STREAMS Programming Guide

SunOS 5.11							    16 Jan 2006 							putctl(9F)