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

free_rtn —
structure that specifies a driver's message-freeing routine

#include <sys/stream.h>

Architecture independent level 1 (DDI/DKI).

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. 

void     (*free_func)()      /* user's freeing routine */
char     *free_arg           /* arguments to free_func() */

The free_rtn structure is defined as type frtn_t.

esballoc(9F), freeb(9F), datab(9S)

STREAMS Programming Guide.

July 9, 2018 illumos