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FreeBSD 11.0 - man page for dwarf_vendor_ext (freebsd section 3)

DWARF_VENDOR_EXT(3)					   BSD Library Functions Manual 				       DWARF_VENDOR_EXT(3)

dwarf_vendor_ext -- add vendor-specific macro information to a DWARF producer instance
DWARF Access Library (libdwarf, -ldwarf)
#include <libdwarf.h> int dwarf_vendor_ext(Dwarf_P_Debug dbg, Dwarf_Unsigned constant, char *string, Dwarf_Error *err);
Function dwarf_vendor_ext() adds a vendor-specific macro information entry to a DWARF producer instance. Argument dbg should reference a DWARF producer instance allocated using dwarf_producer_init(3) or dwarf_producer_init_b(3). Argument constant specifies a constant value for the macro information entry. Argument string point to a NUL-terminated string containing the string value for the macro information entry. If argument err is not NULL, it will be used to store error information in case of an error. The meaning of the arguments constant and string are not defined by the DWARF specification, but are instead governed by application and ven- dor conventions.
On success, function dwarf_vendor_ext() returns DW_DLV_OK. In case of an error, function dwarf_vendor_ext() returns DW_DLV_ERROR and sets the argument err.
Function dwarf_vendor_ext() can fail with: [DW_DLE_ARGUMENT] Either arguments dbg or string was NULL. [DW_DLE_MEMORY] An out of memory condition was encountered during the execution of the function.
dwarf(3), dwarf_def_macro(3), dwarf_end_macro_file(3), dwarf_producer_init(3), dwarf_producer_init_b(3), dwarf_start_macro_file(3), dwarf_undef_macro(3)
September 25, 2011 BSD