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  18 .Dd July 9, 2018
  19 .Dt FREE_RTN 9S
  20 .Os
  21 .Sh NAME
  22 .Nm free_rtn
  23 .Nd structure that specifies a driver's message-freeing routine
  24 .Sh SYNOPSIS
  25 .In sys/stream.h
  26 .Sh INTERFACE LEVEL
  27 Architecture independent level 1 (DDI/DKI).
  28 .Sh DESCRIPTION
  29 The
  30 .Vt free_rtn
  31 structure is referenced by the
  32 .Vt datab
  33 structure.
  34 When
  35 .Xr freeb 9F
  36 is called to free the message, the driver's message-freeing
  37 routine (referenced through the
  38 .Vt free_rtn
  39 structure) is called, with arguments, to free the data buffer.
  40 .Sh STRUCTURE MEMBERS
  41 .Bd -literal -offset 2n
  42 void     (*free_func)()      /* user's freeing routine */
  43 char     *free_arg           /* arguments to free_func() */
  44 .Ed
  45 .Pp
  46 The
  47 .Vt free_rtn
  48 structure is defined as type
  49 .Vt frtn_t .
  50 .Sh SEE ALSO
  51 .Xr esballoc 9F ,
  52 .Xr freeb 9F ,
  53 .Xr datab 9S
  54 .Rs
  55 .%T STREAMS Programming Guide
  56 .Re