Calling C from Factor
Factor handbook ยป C library interface

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The easiest way to call into a C library is to define bindings using a pair of parsing words:



The above parsing words create word definitions which call a lower-level word; you can use it directly, too:
alien-invoke ( args... return library function parameters varargs? -- return... )

Sometimes it is necessary to invoke a C function pointer, rather than a named C function:
alien-indirect ( args... funcptr return parameters abi -- return... )

There are some details concerning the conversion of Factor objects to C values, and vice versa. See Passing data between Factor and C.