from cffi import FFI ffi = FFI() lib = ffi.dlopen('libc.so.6') # the C library size = lib.sizeof('int') print(size)
from cffi import FFI ffi = FFI() lib = ffi.dlopen('mylib.so') # a custom library my_struct = ffi.new('struct my_struct*') # allocate memory for a struct my_struct.field1 = 42 my_struct.field2 = "hello" result = lib.my_function(my_struct)This code uses a custom library `mylib.so` to call a C function `my_function` that takes a struct `my_struct` as an argument. The code allocates memory for the struct using `ffi.new`, sets some fields, and then passes it to the C function. Determining the package library for Python cffi FFI requires looking at the documentation or querying the package manager for information on the package's dependencies. In this case, the package dependencies would include the C compiler toolchain and any C libraries that the user wishes to interact with.