DWARF_GET_WEAKS(3)					   BSD Library Functions Manual 					DWARF_GET_WEAKS(3)

NAME

     dwarf_get_weaks, dwarf_weak_cu_offset, dwarf_weak_die_offset, dwarf_weak_name_offsets, dwarf_weakname -- retrieve information about weak sym-
     bols

LIBRARY

     DWARF Access Library (libdwarf, -ldwarf)

SYNOPSIS

     #include <libdwarf.h>

     int
     dwarf_get_weaks(Dwarf_Debug dbg, Dwarf_Weak **weaks, Dwarf_Signed *nweaks, Dwarf_Error *err);

     int
     dwarf_weak_cu_offset(Dwarf_Weak weak, Dwarf_Off *cu_offset, Dwarf_Error *err);

     int
     dwarf_weak_die_offset(Dwarf_Weak weak, Dwarf_Off *die_offset, Dwarf_Error *err);

     int
     dwarf_weak_name_offsets(Dwarf_Weak weak, char **name, Dwarf_Off *die_offset, Dwarf_Off *cu_die_offset, Dwarf_Error *err);

     int
     dwarf_weakname(Dwarf_Weak weak, char **name, Dwarf_Error *err);

DESCRIPTION

     These functions retrieve information about weak symbols from the lookup tables in the (SGI-specific) ``.debug_weaknames'' section.  Informa-
     tion about weak symbols is returned using opaque descriptors of type Dwarf_Weak.  Applications need to use the functions described below to
     retrieve the name and offset information contained in these descriptors.

     Function dwarf_get_weaks() retrieves descriptors for all the weak symbols associated with the DWARF debug context specified by argument dbg.
     The argument weaks should point to a location that will be set to a pointer to an array of Dwarf_Weak descriptors.  The argument nweaks
     should point to a location that will be set to the number of descriptors returned.

     Function dwarf_weak_cu_offset() returns the offset, relative to the ``.debug_info'' section, of the compilation unit that contains the debug-
     ging information entry associated with the argument weak.	Argument cu_offset should point to a location that will hold the returned offset.

     Function dwarf_weak_die_offset() retrieves the offset, relative to the ``.debug_info'' section, of the debugging information entry associated
     with the argument weak, and stores it into the location pointed to by the argument die_offset.

     Function dwarf_weak_name_offsets() retrieves the name and offsets for the debugging information entry for argument weak.  Argument name
     should point to a location which will be set to a pointer to a NUL-terminated string containing the name of the associated debugging informa-
     tion entry.  Argument die_offset should point to a location which will be set to the offset, relative to the ``.debug_info'' section, of the
     associated debugging information entry.  Argument cu_die_offset should point to a location which will be set to the offset, relative to the
     ``.debug_info'' section, of the first debugging information entry in the compilation unit associated with argument weak.

     Function dwarf_weakname() sets the location pointed to by argument name to a pointer to a NUL-terminated string holding the name of the
     debugging information entry associated with the argument weak.

   Memory Management
     The memory area used for the array of Dwarf_Weak descriptors returned in argument weaks by function dwarf_get_weaks() is owned by the DWARF
     Access Library (libdwarf, -ldwarf).  Application code should not attempt to directly free this pointer.  Portable code should instead use the
     function dwarf_weaks_dealloc(3) to indicate that the memory area may be freed.

     The memory area used for the string returned in the name argument to functions dwarf_weak_name_offsets() and dwarf_weakname() is owned by the
     DWARF Access Library (libdwarf, -ldwarf).	Portable code should indicate that the memory area can be freed using the dwarf_dealloc(3) func-
     tion.

   Error Returns
     If argument err is not NULL, these functions will use it to store error information, in case of an error.

RETURN VALUES

     On success, these functions returns DW_DLV_OK.  In case of an error, they return DW_DLV_ERROR and set the argument err.

ERRORS

     These functions may fail with the following errors:

     [DW_DLE_ARGUMENT]	One of the arguments cu_die_offset, cu_offset, dbg, die_offset, weak, weaks, name, or nweaks was NULL.

     [DW_DLE_NO_ENTRY]	The DWARF debugging context referenced by argument dbg did not contain information about weak symbols.

SEE ALSO

     dwarf(3), dwarf_get_cu_die_offset_given_cu_header_offset(3), dwarf_weaks_dealloc(3)

BSD
								  April 10, 2011							       BSD