Manual Pages  — DWARF_PRODUCER_INIT

The argument errhand should contain the address of a function to be called in case of an error. If this argument is NULL, the default error handling scheme is used, see dwarf(3).

The argument errarg will be passed to the error handler function when it is invoked.

The argument err references a memory location that would hold a Dwarf_Error descriptor in case of an error.

The argument flags specifies additional characteristics of the DWARF producer instance. The following flags are recognized:

DW_DLC_ISA_IA64	(Deprecated) The target instruction set architecture is IA64. This flag is deprecated. Application code should use the dwarf_producer_set_isa(3) function to specify target instruction set architecture.
DW_DLC_ISA_MIPS	(Deprecated) The target instruction set architecture is MIPS. This flag is deprecated. Application code should use the dwarf_producer_set_isa(3) function to specify target instruction set architecture.
DW_DLC_SIZE_32	(Default) The target address size is 32-bit.
DW_DLC_SIZE_64	The target address size is 64-bit.
DW_DLC_STREAM_RELOCATIONS
	(Default) Generate stream relocations.
DW_DLC_SYMBOLIC_RELOCATIONS
	Generate symbolic relocations.
DW_DLC_TARGET_BIGENDIAN
	The target is big endian.
DW_DLC_TARGET_LITTLEENDIAN
	The target is little endian.
DW_DLC_WRITE	(Required) Permit writing of DWARF information.

The following flags are mutually exclusive.

• Flags DW_DLC_ISA_IA64 and DW_DLC_ISA_MIPS.
• Flags DW_DLC_SIZE_32 and DW_DLC_SIZE_64.
• Flags DW_DLC_STREAM_RELOCATIONS and DW_DLC_SYMBOLIC_RELOCATIONS.
• Flags DW_DLC_TARGET_BIGENDIAN and DW_DLC_TARGET_LITTLEENDIAN.

Argument func should point to an application-provided callback function of type Dwarf_Callback_Func_b. The type Dwarf_Callback_Func_b is defined in the header file <libdwarf.h> as:

typedef int (*Dwarf_Callback_Func_b)(char *name, int size,
    Dwarf_Unsigned type, Dwarf_Unsigned flags, Dwarf_Unsigned link,
    Dwarf_Unsigned info, Dwarf_Unsigned *index, int *error);

This function is called by the DWARF Access Library (libdwarf, -ldwarf)once for each section in the object file that the library needs to create. The arguments to this callback function specify the values in the ELF section header for the section being created:

name	The name of the section being created.
size	The sh_size value in the section header.
type	The sh_type value in the section header.
flags	The sh_flags value in the section header.
link	The sh_link value in the section header.
info	The sh_info value in the section header.

On success, the callback function should return the section index value of the created section, and set the location pointed to by argument index to the symbol table index of the symbol that associated with the newly created section. This symbol table index will be used in relocation entries referring to the created section.

In case of failure, the callback function should return -1 and set the location pointed to by argument error to an application-defined error code. This application returned error code is currently ignored by the library.

Function dwarf_producer_init() is deprecated. Function dwarf_producer_init() is identical to function dwarf_producer_init_b() except that the callback function it expects can not properly handle arbitrary section symbol index values.