import ffi libc = ffi.open("libc.so.6") print("libc:", libc) print() # Declare few functions perror = libc.func("v", "perror", ["s"]) time = libc.func("i", "time", "p") open = libc.func("i", "open", ["s", "i"]) qsort = libc.func("v", "qsort", "piip") # And one variable errno = libc.var("i", "errno") print("time:", time) print("UNIX time is:", time(None)) print() perror("ffi before error") open("somethingnonexistent__", 0) print(errno) perror("ffi after error") print() def cmp(pa, pb): a = ffi.as_bytearray(pa, 1) b = ffi.as_bytearray(pb, 1) print("cmp:", a, b) return a[0] - b[0] cmp_c = ffi.callback("i", cmp, "pp") print("callback:", cmp_c) # TODO: violates Py semantics, pass bytearray s = "foobar" print("org string:", s) qsort(s, len(s), 1, cmp_c) print("qsort'ed:", s)