linenum(FP)

linenum -- line number entries in a common object file

Format

#include <linenum.h>

Description

The cc command generates an entry in the object file for each C source line on which a breakpoint is possible (when invoked with the -g option; see cc(CP)). Users can then reference line numbers when using the appropriate software test system (see sdb(CP)). The structure of these line number entries follows:

   struct     lineno
   {
              union
              {
                      long     l_symndx ;
                      long     l_paddr ;
              } l_addr ;
              unsigned short   l_lnno ;
   } ;

Numbering starts with one for each function. The initial line number entry for a function has l_lnno equal to zero, and the symbol table index of the function's entry is in l_symndx. Otherwise, l_lnno is non-zero, and l_paddr is the physical address of the code for the referenced line. Thus the overall structure is the following:

   l_addr            l_lnno
   
   function symtab   index        0
   physical address  line
   physical address  line
   ...
   

   function symtab   index        0
   physical address  line
   physical address  line
   ...

Standards conformance

linenum(FP) is not part of any currently supported standard; it was developed by UNIX System Laboratories, Inc. and is maintained by The SCO Group.

linenum(FP)

Format

Description

See also

Standards conformance