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.Dd July 9, 2018
.Dt FREE_RTN 9S
.Os
.Sh NAME
.Nm free_rtn
.Nd structure that specifies a driver's message-freeing routine
.Sh SYNOPSIS
.In sys/stream.h
.Sh INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
.Sh DESCRIPTION
The
.Vt free_rtn
structure is referenced by the
.Vt datab
structure.
When
.Xr freeb 9F
is called to free the message, the driver's message-freeing
routine (referenced through the
.Vt free_rtn
structure) is called, with arguments, to free the data buffer.
.Sh STRUCTURE MEMBERS
.Bd -literal -offset 2n
void     (*free_func)()      /* user's freeing routine */
char     *free_arg           /* arguments to free_func() */
.Ed
.Pp
The
.Vt free_rtn
structure is defined as type
.Vt frtn_t .
.Sh SEE ALSO
.Xr esballoc 9F ,
.Xr freeb 9F ,
.Xr datab 9S
.Rs
.%T STREAMS Programming Guide
.Re