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POSIX Message Queue Memory Allocation
Post 302597438 by Corona688 on Friday 10th of February 2012 10:01:10 AM
02-10-2012
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LEARN ABOUT OPENSOLARIS
putctl1
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 SunOS 5.11 16 Jan 2006 putctl1(9F)