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free_rtn(9s) [opensolaris man page]

free_rtn(9S)						    Data Structures for Drivers 					      free_rtn(9S)

NAME
free_rtn - structure that specifies a driver's message-freeing routine SYNOPSIS
#include <sys/stream.h> INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI). DESCRIPTION
The free_rtn structure is referenced by the datab structure. When freeb(9F) is called to free the message, the driver's message-freeing routine (referenced through the free_rtn structure) is called, with arguments, to free the data buffer. STRUCTURE MEMBERS
void (*free_func)() /* user's freeing routine */ char *free_arg /* arguments to free_func() */ The free_rtn structure is defined as type frtn_t. SEE ALSO
esballoc(9F), freeb(9F), datab(9S) STREAMS Programming Guide SunOS 5.11 13 Nov 1996 free_rtn(9S)

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

NAME
freeb - free a message block SYNOPSIS
#include <sys/stream.h> void freeb(mblk_t *bp); PARAMETERS
bp Pointer to the message block to be deallocated. mblk_t is an instance of the msgb(9S) structure. INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI). DESCRIPTION
freeb() deallocates a message block. If the reference count of the db_ref member of the datab(9S) structure is greater than 1, freeb() decrements the count. If db_ref equals 1, it deallocates the message block and the corresponding data block and buffer. If the data buffer to be freed was allocated with the esballoc(9F), the buffer may be a non-STREAMS resource. In that case, the driver must be notified that the attached data buffer needs to be freed, and run its own freeing routine. To make this process independent of the driver used in the stream, freeb() finds the free_rtn(9S) structure associated with the buffer. The free_rtn structure contains a pointer to the driver-dependent routine, which releases the buffer. Once this is accomplished, freeb() releases the STREAMS resources associated with the buffer. CONTEXT
freeb() can be called from user or interrupt context. EXAMPLES
Example 1: Using freeb() See copyb(9F) for an example of using freeb(). SEE ALSO
allocb(9F), copyb(9F), dupb(9F), esballoc(9F), free_rtn(9S) Writing Device Drivers STREAMS Programming Guide SunOS 5.10 13 Nov 2000 freeb(9F)
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