This function allows us to query the set of routines
in a DLL that are registered with R to enhance
dynamic lookup, error handling when calling native routines,
and potentially security in the future.
This function provides a description of each of the
registered routines in the DLL for the different interfaces,
i.e..C, .Call, .Fortran
and .External.
getDLLRegisteredRoutines(dll, addNames = TRUE)a character string or DLLInfo object.
The character string specifies the file name of the DLL
of interest, and is given without the file name extension (e.g., the
.dll or .so) and with no directory/path information.
So a file MyPackage/libs/MyPackage.so would be specified as
MyPackage.
The DLLInfo objects can be obtained directly
in calls to dyn.load and library.dynam,
or can be found after the DLL has been loaded using
getLoadedDLLs, which returns a list of
DLLInfo objects (index-able by DLL file name).
The DLLInfo approach avoids any ambiguities related to two
DLLs having the same name but corresponding to files in different
directories.
a logical value. If this is TRUE, the elements
of the returned lists are named using the names of the routines (as
seen by R via registration or raw name). If FALSE,
these names are not computed and assigned to the lists. As a
result, the call should be quicker. The name information is also
available in the NativeSymbolInfo objects in the lists.
A list of class "DLLRegisteredRoutines" with four elements
corresponding to the routines registered for the .C,
.Call, .Fortran and .External interfaces. Each is
a list with as many elements as there were routines registered for
that interface.
Each element identifies a routine and is an object
of class "NativeSymbolInfo".
An object of this class has the following fields:
the registered name of the routine (not necessarily the name in the C code).
the memory address of the routine as resolved in the
loaded DLL. This may be NULL if the symbol has not yet been
resolved.
an object of class DLLInfo describing the DLL.
This is same for all elements returned.
the number of arguments the native routine is to be called with. In the future, we will provide information about the types of the parameters also.
This takes the registration information after it has been registered and processed by the R internals. In other words, it uses the extended information.
There is print methods for the class, which prints only the
types which have registered routines.
‘Writing R Extensions Manual’ for symbol registration.
R News, Volume 1/3, September 2001. "In search of C/C++ & Fortran Symbols"
getLoadedDLLs,
getNativeSymbolInfo for information on the entry points listed.
dlls <- getLoadedDLLs()
getDLLRegisteredRoutines(dlls[["base"]])
getDLLRegisteredRoutines("stats")
Run the code above in your browser using DataLab