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dlsym (3) and dlvsym (3) functions return the address of a symbol in a shared object or executable handle. They take a symbol name, a version string, and a special handle (RTLD_DEFAULT or RTLD_NEXT) as arguments.
Learn how to use dlopen, dlsym, dlclose, and dlerror to load and resolve symbols from dynamic libraries in Linux. See the syntax, flags, error handling, and library search order of these functions.
The dlsym () function shall obtain the address of a symbol (a function identifier or a data object identifier) defined in the symbol table identified by the handle argument. The handle argument is a symbol table handle returned from a call to dlopen () and the name argument is the symbol's name as a character string.
dlsym(3) BSD Library Functions Manual dlsym(3) NAME dlsym -- get address of a symbol SYNOPSIS #include void* dlsym (void* handle, const char* symbol); DESCRIPTION dlsym () returns the address of the code or data location specified by the null-terminated character string symbol. Which libraries and bundles are searched depends on the handle parameter. If dlsym () is called with a ...
The function dlsym () takes a "handle" of a dynamic loaded shared object returned by dlopen (3) along with a null-terminated symbol name, and returns the address where that symbol is loaded into memory.
dlsym () returns the address binding of the symbol as it occurs in the shared object identified by handle. It returns a NULL pointer if the symbol cannot be found.
dlsym () The function dlsym () takes a "handle" of a dynamic library returned by dlopen () and the null-terminated symbol name, returning the address where that symbol is loaded into memory.
dlsym () is a C or C++ function that returns the address of a symbol defined within a dynamic link library (DLL) made accessible through a dlopen () call. The function searches the DLL and its dependents for the named symbol, and returns NULL if not found.
The function dlsym () takes a "handle" of a dynamic loaded shared object returned by dlopen (3) along with a null-terminated symbol name, and returns the address where that symbol is loaded into memory.
The dlsym () function is available only to dynamically linked processes. If handle is a handle returned by dlopen (), you must not have closed that shared object by calling dlclose (). The dlsym () functions also searches for the named symbol in the objects loaded as part of the dependencies for that object.