rtld

Files
file	dlfcn.c
file	dlfcn.h
	UNIX-like dynamic linker interface.
file	dynamic.c
file	module.c
file	rtld.c
file	symbol.c
Defines
#define	NAME_BUF_SIZE   64
Functions
static elf_symbol_t *	def_find_in_module (const char *name, module_t *m)
void *	dlopen (const char *path, int flag)
void *	dlsym (void *mod, const char *sym_name)
void	dynamic_parse (elf_dyn_t *dyn_ptr, size_t bias, dyn_info_t *info)
static elf_word	elf_hash (const unsigned char *name)
module_t *	module_find (const char *name)
	Find module structure by soname/pathname.
module_t *	module_load (const char *name)
	Load a module.
void	module_load_deps (module_t *m)
	Load all modules on which m (transitively) depends.
void	module_process_relocs (module_t *m)
	(Eagerly) process all relocation tables in a module.
void	modules_process_relocs (module_t *start)
	Process relocations in modules.
void	modules_untag (void)
	Clear BFS tags of all modules.
void	rtld_init_static (void)
	Initialize the loder for use in a statically-linked binary.
elf_symbol_t *	symbol_bfs_find (const char *name, module_t *start, module_t **mod)
	Find the definition of a symbol in a module and its deps.
elf_symbol_t *	symbol_def_find (const char *name, module_t *origin, module_t **mod)
	Find the definition of a symbol.
void *	symbol_get_addr (elf_symbol_t *sym, module_t *m)
Variables
static runtime_env_t	rt_env_static
runtime_env_t *	runtime_env

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Function Documentation

module_t* module_find

(

const char *

name

)

Find module structure by soname/pathname.

Used primarily to see if a module has already been loaded. Modules are compared according to their soname, i.e. possible path components are ignored.

Definition at line 93 of file module.c.

module_t* module_load

(

const char *

name

)

Load a module.

Currently this trivially tries to load '/<name>'.

Definition at line 130 of file module.c.

void module_process_relocs

(

module_t *

m

)

(Eagerly) process all relocation tables in a module.

Currently works as if LD_BIND_NOW was specified.

Definition at line 55 of file module.c.

void modules_process_relocs

(

module_t *

start

)

Process relocations in modules.

Processes relocations in start and all its dependencies. Modules that have already been relocated are unaffected.

Parameters:

start

The module where to start from.

Definition at line 249 of file module.c.

elf_symbol_t* symbol_bfs_find	(	const char *	name,
		module_t *	start,
		module_t **	mod
	)

Find the definition of a symbol in a module and its deps.

Search the module dependency graph is breadth-first, beginning from the module start. Thus, and all its dependencies get searched.

Parameters:

	name	Name of the symbol to search for.
	start	Module in which to start the search..
	mod	(output) Will be filled with a pointer to the module that contains the symbol.

Definition at line 116 of file symbol.c.

elf_symbol_t* symbol_def_find	(	const char *	name,
		module_t *	origin,
		module_t **	mod
	)

Find the definition of a symbol.

By definition in System V ABI, if module origin has the flag DT_SYMBOLIC, origin is searched first. Otherwise, or if the symbol hasn't been found, the module dependency graph is searched breadth-first, beginning from the executable program.

Parameters:

	name	Name of the symbol to search for.
	origin	Module in which the dependency originates.
	mod	(output) Will be filled with a pointer to the module that contains the symbol.

Definition at line 193 of file symbol.c.

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