11544 ofmt(3OFMT) should talk about the callback handler
Reviewed by: Dan McDonald <danmcd@joyent.com>
Reviewed by: Jason King <jason.brian.king@gmail.com>

@@ -86,12 +86,17 @@
 
      of_cb is the application-specified callback function with the following
      prototype that provides a string representation of the value to be
      printed for the field:
 
-           (*of_cb)(ofmt_arg_t *ofmt_arg, char *buf, uint_t bufsize)
+           boolean_t (*of_cb)(ofmt_arg_t *ofmt_arg, char *buf, uint_t bufsize)
 
+     The callback must not write beyond bufsize bytes of the string form into
+     buf.  If the function successfully translates the field into its string
+     representation and places it into buf, then the callback function should
+     return B_TRUE.  Otherwise, the callback function should return B_FALSE.
+
      The interpretation of the of_id field is completely private to the
      caller, and can be optionally used by the callback function as a cookie
      to identify the field being printed when a single callback function is
      shared between multiple template entries.
 

@@ -160,6 +165,6 @@
      Private.
 
 SEE ALSO
      ioctl(2), strerror(3C), attributes(5)
 
-illumos                          June 1, 2017                          illumos
+illumos                        December 20, 2018                       illumos