search for: py_return_non

Fix some things I noticed while reviewing v1, and follow Rich's idea to add a new nbdkit_set_error() utility function with a binding for Python users to request a particular error (rather than being forced to live with whatever stale value is in errno after all the intermediate binding glue code). I could not easily find out how to register a C function callable from perl bindings, and have

...n/python.c +++ b/plugins/python/python.c @@ -54,6 +54,23 @@ static const char *script; static PyObject *module; +static PyObject * +set_error (PyObject *self, PyObject *args) +{ + int err; + + if (!PyArg_ParseTuple(args, "i", &err)) + return NULL; + nbdkit_set_error (err); + Py_RETURN_NONE; +} + +static PyMethodDef NbdkitMethods[] = { + { "set_error", set_error, METH_VARARGS, + "Store an errno value prior to throwing an exception" }, + { NULL } +}; + /* Is a callback defined? */ static int callback_defined (const char *name, PyObject **obj_rtn) @@ -91,6 +...

...c PyObject *module; +static int last_error; + static PyObject * set_error (PyObject *self, PyObject *args) { @@ -62,6 +64,7 @@ set_error (PyObject *self, PyObject *args) if (!PyArg_ParseTuple(args, "i", &err)) return NULL; nbdkit_set_error (err); + last_error = err; Py_RETURN_NONE; } @@ -441,6 +444,48 @@ py_trim (void *handle, uint32_t count, uint64_t offset) } static int +py_zero (void *handle, uint32_t count, uint64_t offset, int may_trim) +{ + PyObject *obj = handle; + PyObject *fn; + PyObject *args; + PyObject *r; + + if (callback_defined ("zero", &a...

...c PyObject *module; +static int last_error; + static PyObject * set_error (PyObject *self, PyObject *args) { @@ -62,6 +64,7 @@ set_error (PyObject *self, PyObject *args) if (!PyArg_ParseTuple(args, "i", &err)) return NULL; nbdkit_set_error (err); + last_error = err; Py_RETURN_NONE; } @@ -441,6 +444,48 @@ py_trim (void *handle, uint32_t count, uint64_t offset) } static int +py_zero (void *handle, uint32_t count, uint64_t offset, int may_trim) +{ + PyObject *obj = handle; + PyObject *fn; + PyObject *args; + PyObject *r; + + if (callback_defined ("zero", &a...

This cleans up the existing code base with regards to implicit use of errno from language bindings, then rebases the previous work in python on top of that. I'm still playing with the perl bindings, but got further after reading 'perldoc perlembed'. Eric Blake (4): plugins: Don't use bogus errno from non-C plugins plugins: Add new nbdkit_set_error() utility function python: