cimport libc

cdef extern from "Python.h" :
    struct PyObject :
        pass

    ## string stuff
    int PyObject_AsCharBuffer (object obj, char **buf, libc.ssize_t *len) except -1
    
    ## except setting
    PyObject* PyErr_SetFromErrno (PyObject *type)

    PyObject *PyExc_OSError
    
# raise OSError with errno
# XXX: doesn't do anything with func
cdef int raise_errno (char *func) except -1