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DWARF_ATTRLIST(3)          Library Functions Manual          DWARF_ATTRLIST(3)

NAME
     dwarf_attrlist -- retrieve DWARF attribute descriptors

LIBRARY
     DWARF Access Library (libdwarf, -ldwarf)

SYNOPSIS
     #include <libdwarf.h>

     int
     dwarf_attrlist(Dwarf_Die die, Dwarf_Attribute **attrbuf,
         Dwarf_Signed *attrcount, Dwarf_Error *err);

DESCRIPTION
     Function dwarf_attrlist() retrieves the DWARF attribute descriptors
     associated with a debugging information entry descriptor in argument die.
     The descriptors are returned as an array of values of the opaque type
     Dwarf_Attribute.  The data associated with each returned attribute
     descriptor may be queried using the form query functions in the dwarf(3)
     API set.

     Argument attrbuf points to a location that will hold a pointer to the
     returned array of DWARF attribute descriptors.  Argument attrcount points
     to a location that will hold the number of descriptors in the returned
     array.

     If argument err is non-NULL, it is used to return an error descriptor in
     case of an error.

   Memory Management
     In the current implementation, the memory allocated for each DWARF
     attribute descriptor and for the returned array of descriptors is managed
     by the library and the application does not need to explicitly free the
     returned pointers.  However, for compatibility with other implementations
     of the dwarf(3) API, the application is permitted to pass the pointers
     returned by to the dwarf_dealloc() function.

RETURN VALUES
     Function dwarf_attrlist() returns DW_DLV_OK on success.

     If the debugging information entry descriptor denoted by argument die
     does not contain any attribute, the function returns DW_DLV_NO_ENTRY and
     sets argument err.  For other errors, it returns DW_DLV_ERROR and sets
     argument err.

EXAMPLES
     To retrieve the attribute list for a DWARF debugging information entry
     use:

           Dwarf_Die dw_die;
           Dwarf_Error dw_e;
           Dwarf_Unsigned dw_count;
           Dwarf_Attribute *dw_attributes;
           int error, i;

           ... variable dw_die contains a reference to the DIE of interest ...

           /* Retrieve the attribute list from the DIE. */
           if ((error = dwarf_attrlist(dw_die, &dw_attributes, &dw_count,
                   &dw_e)) != DW_DLV_OK)
                   errx(EXIT_FAILURE, "dwarf_attrlist: %s", dwarf_errmsg(dw_e));

           /* Process the attribute list. */
           for (i = 0; i < dw_count; ++i) {
                   /* Use the returned pointers in dw_attributes[i] here. */
           }

ERRORS
     Function dwarf_diename() can fail with the following errors:

     [DW_DLE_ARGUMENT]       Arguments die, attrbuf, or attrcount were NULL.

     [DW_DLE_NO_ENTRY]       Argument die had no attributes.

     [DW_DLE_MEMORY]         An out of memory condition was encountered during
                             the execution of the function.

SEE ALSO
     dwarf(3), dwarf_attr(3), dwarf_dealloc(3), dwarf_hasattr(3),
     dwarf_hasform(3), dwarf_whatattr(3), dwarf_whatform(3)

NetBSD 7.1.2                   November 9, 2011                   NetBSD 7.1.2