DLSYM(3)

NAME
dlsym - get address of a symbol

SYNOPSIS
#include <dlfcn.h>
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 handle, returned by dlopen() then only that image and any libraries it depends on are searched for symbol.

If dlsym() is called with the special handle RTLD_DEFAULT, then every mach-o image in the process is searched in the order they were loaded. This can be a costly search and should be avoided.

If dlsym() is called with the special handle RTLD_NEXT, then the search for the symbol is limited to the images which were loaded after the one issuing the call to dlsym().

RETURN VALUES
The dlsym() function returns a null pointer if the symbol cannot be found, and sets an error condition which may be queried with dlerror().

NOTES
Unlike other dyld API's, the symbol name passed to dlsym() must NOT be prepended with an underscore.

SEE ALSO
dlopen(3) dlsym(3) dlerror(3) dyld(3) NSModule(3) NSObjectFileImage(3) ld(1) cc(1)