Function libffi::low::call [−] [src]

pub unsafe fn call<R>(
    cif: *mut ffi_cif, 
    fun: CodePtr, 
    args: *mut *mut c_void
) -> R

Calls a C function as specified by a CIF.

Arguments

cif — describes the argument and result types and the calling convention
fun — the function to call
args — the arguments to pass to fun

Result

The result of calling fun with args.

Examples

use std::os::raw::c_void;
use libffi::low::*;

extern "C" fn c_function(a: u64, b: u64) -> u64 { a + b }

let result = unsafe {
    let mut args: Vec<*mut ffi_type> = vec![ &mut types::uint64,
                                             &mut types::uint64 ];
    let mut cif: ffi_cif = Default::default();

    prep_cif(&mut cif, ffi_abi_FFI_DEFAULT_ABI, 2,
             &mut types::uint64, args.as_mut_ptr()).unwrap();

    call(&mut cif, CodePtr(c_function as *mut _),
         vec![ &mut 4u64 as *mut _ as *mut c_void,
               &mut 5u64 as *mut _ as *mut c_void ].as_mut_ptr())
};

assert_eq!(9, result);