dlfcn.h

Overview

Related Modules:

LINKER

Description:

Provides functions and structures related to linking and loading.

This file provides functions and structures for opening and closing a dynamic-link library (DLL) and searching for the specified symbols based on the DLL.

Since:

1.0

Version:

1.0

Summary

Macros

Macro Name and Value Description
RTLD_LAZY   1 All undefined symbols in the shared object are not resolved before dlopen() returns.
RTLD_NOW   2 All undefined symbols in the shared object are resolved before dlopen() returns.
RTLD_NOLOAD   4 The shared object is not loaded. It can be used to test whether the object resides in the memory.
RTLD_NODELETE   4096 The shared object is not deleted during dlclose().
RTLD_GLOBAL   256 The symbols defined by the loaded shared object can be resolved by other shared objects opened later.
RTLD_LOCAL   0 The symbols defined by the loaded shared object cannot be resolved by other shared objects opened later.
RTLD_NEXT   ((void )-1) The next match of the required symbol is searched in the search order after the current object.
RTLD_DEFAULT   ((void )0) The first match of the required symbol is searched in the default shared object search order. The search scope includes the global symbols of the program and its dependencies, and the global symbols loaded by the dlopen() function.
RTLD_DI_LINKMAP   2 The pointer to the link_map structure of the specified handle.

Functions

Function Name Description
dlclose (void handle) int Closes the DLL of a specified handle.
dlerror (void) char Obtains the latest error that occurred during a DLL function execution failure.
dlopen (const char filename, int flags) void Opens a DLL and returns its handle.
dlsym (void handle, const char symbol) void * Searches for a specified symbol based on the DLL handle.