Manual Pages for UNIX Operating System command usage for man TNF_DEFINE_RECORD_2

TNF Library Functions                    TNF_DECLARE_RECORD(3TNF)



NAME
     TNF_DECLARE_RECORD,                     TNF_DEFINE_RECORD_1,
     TNF_DEFINE_RECORD_2,                    TNF_DEFINE_RECORD_3,
     TNF_DEFINE_RECORD_4, TNF_DEFINE_RECORD_5 - TNF  type  exten-
     sion interface for probes

SYNOPSIS
     cc [ flag ... ] file ...[ -ltnfprobe ] [ library ... ]
     #include 



     TNF_DECLARE_RECORD(c_type, tnf_type);


     TNF_DEFINE_RECORD_1(c_type, tnf_type, tnf_member_type_1, c_member_name_1);


     TNF_DEFINE_RECORD_2(c_type, tnf_type, tnf_member_type_1, c_member_name_1,
          tnf_member_type_2, c_member_name_2);


     TNF_DEFINE_RECORD_3(c_type, tnf_type, tnf_member_type_1, c_member_name_1,
          tnf_member_type_2, c_member_name_2, tnf_member_type_3,
          c_member_name_3);


     TNF_DEFINE_RECORD_4(c_type, tnf_type, tnf_member_type_1, c_member_name_1,
          tnf_member_type_2, c_member_name_2, tnf_member_type_3,
          c_member_name_3, tnf_member_type_4, c_member_name_4);


     TNF_DEFINE_RECORD_5(c_type, tnf_type, tnf_member_type_1, c_member_name_1,
          tnf_member_type_2, c_member_name_2, tnf_member_type_3,
          c_member_name_3,tnf_member_type_4, c_member_name_4,
          tnf_member_type_5, c_member_name_5);


DESCRIPTION
     This macro interface is used to extend the TNF (Trace Normal
     Form) types that can be used in  TNF_PROBE(3TNF).


     There  should  be  only  one  TNF_DECLARE_RECORD   and   one
     TNF_DEFINE_RECORD   per   new   type   being   defined.  The
     TNF_DECLARE_RECORD should precede the TNF_DEFINE_RECORD.  It
     can  be in a header file that multiple source files share if
     those source  files need to use the  tnf_type being defined.
     The  TNF_DEFINE_RECORD  should  only  appear  in  one of the
     source files.





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TNF Library Functions                    TNF_DECLARE_RECORD(3TNF)



     The TNF_DEFINE_RECORD macro  interface defines a function as
     well  as a couple of data structures. Hence,  this interface
     has to be used in a source file (.c or  .cc  file)  at  file
     scope and  not inside a function.


     Note that there is no semicolon after the  TNF_DEFINE_RECORD
     interface.  Having one will generate a compiler warning.


     Compiling with the preprocessor option  -DNPROBE or with the
     preprocessor  control  statement #define NPROBE ahead of the
     #include  statement, will  stop  the  TNF  type
     extension code from being compiled into the program.


     The c_type argument must be a C struct type.  It is the tem-
     plate from which the new tnf_type is being created.  Not all
     elements of the C struct need be provided in  the  TNF  type
     being defined.


     The tnf_type argument is the name being given to  the  newly
     created type. Use of this interface uses the name space pre-
     fixed by tnf_type.  If  a  new  type  called  "xxx_type"  is
     defined  by  a  library,  then  the  library  should not use
     "xxx_type" as a prefix in any other symbols it defines.  The
     policy on managing the type name space is the same as manag-
     ing any other name space in a library; that is,  prefix  any
     new TNF types by the unique prefix that the rest of the sym-
     bols in the library use.  This would prevent name space col-
     lisions when linking multiple  libraries that define new TNF
     types. For example, if a library libpalloc.so uses the  pre-
     fix  "pal"  for  all symbols it defines, then it should also
     use the prefix "pal" for all new TNF types being defined.


     The tnf_member_type_n argument is the TNF type  of  the  nth
     provided member of the C structure.


     The tnf_member_name_n argument is the name of the  nth  pro-
     vided member of the C structure.

EXAMPLES
     Example 1 Defining and using a TNF type.


     The following example demonstrates how a  new  TNF  type  is
     defined and used in a probe. This code is assumed to be part
     of a fictitious library called  "libpalloc.so"  which   uses
     the prefix "pal" for all it's symbols.



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TNF Library Functions                    TNF_DECLARE_RECORD(3TNF)



       #include 
       typedef struct pal_header {
               long    size;
               char *  descriptor;
               struct pal_header *next;
       } pal_header_t;
       TNF_DECLARE_RECORD(pal_header_t, pal_tnf_header);
       TNF_DEFINE_RECORD_2(pal_header_t, pal_tnf_header,
                               tnf_long,   size,
                               tnf_string, descriptor)
       /*
        * Note: name space prefixed by pal_tnf_header should not
        *       be used by this client anymore.
        */
       void
       pal_free(pal_header_t *header_p)
       {
               int state;
               TNF_PROBE_2(pal_free_start, "palloc pal_free",
                       "sunw%debug entering pal_free",
                       tnf_long,       state_var,  state,
                       pal_tnf_header, header_var, header_p);
               . . .
       }


ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Availability                | developer/tnf               |
    |_____________________________|_____________________________|
    | MT-Level                    | MT-Safe                     |
    |_____________________________|_____________________________|


SEE ALSO
     prex(1),            tnfdump(1),             TNF_PROBE(3TNF),
     tnf_process_disable(3TNF), attributes(5)

NOTES
     It is possible to make a tnf_type definition be recursive or
     mutually  recursive  e.g.  a  structure that uses the "next"
     field to point to itself (a linked list). If such  a  struc-
     ture is sent in to a TNF_PROBE(3TNF), then the entire linked
     list will be logged to the  trace  file  (until  the  "next"
     field is NULL). But, if the list is circular, it will result



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TNF Library Functions                    TNF_DECLARE_RECORD(3TNF)



     in an infinite loop. To break the recursion, either  do  not
     include  the  "next"  field  in the  tnf_type, or define the
     type of the "next" member as tnf_opaque.




















































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