This patch provides Python dlpi support.  It may be contributed upstream at
some point, but the suitability (or lack thereof) has not yet been determined.
--- Python-3.9.1/Modules/dlpimodule.c
+++ Python-3.9.1/Modules/dlpimodule.c
@@ -0,0 +1,1226 @@
+/*
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
+ */
+
+#include <Python.h>
+#include <stdio.h>
+#include <libdlpi.h>
+
+typedef struct {
+	PyObject_HEAD
+	dlpi_handle_t dlpihdl;
+} pylink_t;
+
+typedef struct {
+	PyObject *pyfunc;
+	PyObject *pyarg;
+} callback_data_t;
+
+/*
+ * dlpi_err: the only exception raised for libdlpi related error.
+ * The accompanying value is:
+ * (dlpi_error_number, string), when it's a dlpi specific error,
+ * or, (DL_SYSERR, errno, string), when it's coming from a system call.
+ */
+static PyObject *dlpi_err;
+
+static void
+dlpi_raise_exception(int err)
+{
+	PyObject *e = NULL;
+
+	if (err == DL_SYSERR) {
+		e = Py_BuildValue("(iis)", DL_SYSERR, errno, strerror(errno));
+	} else {
+		e = Py_BuildValue("(is)", err, dlpi_strerror(err));
+	}
+	if (e != NULL) {
+		PyErr_SetObject(dlpi_err, e);
+		Py_DECREF(e);
+	}
+}
+
+PyDoc_STRVAR(link_doc,
+    "link(linkname[, flags]) -> link object\n"
+    "\n"
+    "Open linkname with specified flags.\n"
+    "Three flags are supported: PASSIVE, RAW, NATIVE.\n"
+    "And these flags can be bitwise-OR'ed together(default flag is 0).\n"
+    "You need sys_net_rawaccess privilege to open a link.\n"
+    "See dlpi_open(3DLPI).\n"
+);
+static int
+link_init(PyObject *self, PyObject *args, PyObject *kwds)
+{
+	uint_t flags = 0;
+	dlpi_handle_t dh;
+	char *linkname;
+	int rval;
+	static char *keywords[] = {"linkname", "flags", NULL};
+	pylink_t *link = (pylink_t *)self;
+
+	if (!PyArg_ParseTupleAndKeywords(args, kwds, "s|I", keywords,
+	    &linkname, &flags))
+		return (-1);
+
+	if ((rval = dlpi_open(linkname, &dh, flags)) != DLPI_SUCCESS) {
+		dlpi_raise_exception(rval);
+		return (-1);
+	}
+
+	link->dlpihdl = dh;
+
+	return (0);
+}
+
+static void
+link_dealloc(pylink_t *link)
+{
+	if (link->dlpihdl != NULL)
+		dlpi_close(link->dlpihdl);
+	Py_TYPE(link)->tp_free((PyObject *)link);
+}
+
+PyDoc_STRVAR(bind_doc,
+    "bind(sap) -> unsigned int\n"
+    "\n"
+    "Attempts to bind the link to specified SAP, or ANY_SAP.\n"
+    "Returns the SAP that the function actually bound to, which\n"
+    "could be different from the SAP requested.\n"
+    "See dlpi_bind(3DLPI).\n"
+);
+static PyObject *
+link_bind(pylink_t *link, PyObject *args, PyObject *kwds)
+{
+	uint_t sap = 0, boundsap = 0;
+	static char *keywords[] = {"sap", NULL};
+	int rval;
+
+	if (link->dlpihdl == NULL) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if (!PyArg_ParseTupleAndKeywords(args, kwds, "I", keywords, &sap))
+		return (NULL);
+
+	if ((rval = dlpi_bind(link->dlpihdl, sap, &boundsap)) !=
+	    DLPI_SUCCESS) {
+		dlpi_raise_exception(rval);
+		return (NULL);
+	}
+
+	return (Py_BuildValue("I", boundsap));
+}
+
+PyDoc_STRVAR(unbind_doc,
+    "unbind() -> None\n"
+    "\n"
+    "Attempts to unbind the link from previously bound sap.\n"
+    "See dlpi_unbind(3DLPI).\n"
+);
+static PyObject *
+link_unbind(pylink_t *link)
+{
+	int rval;
+
+	if (link->dlpihdl == NULL) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if ((rval = dlpi_unbind(link->dlpihdl)) != DLPI_SUCCESS) {
+		dlpi_raise_exception(rval);
+		return (NULL);
+	}
+
+	Py_INCREF(Py_None);
+	return (Py_None);
+}
+
+PyDoc_STRVAR(send_doc,
+    "send(destaddr, message[, sap, minpri, maxpri]) -> None\n"
+    "\n"
+    "Attempts to send message over this link to sap on destaddr.\n"
+    "If SAP is not specified, the bound SAP is used\n"
+    "You can also specify priority range (minpri, maxpri).\n"
+    "See dlpi_send(3DLPI).\n"
+);
+static PyObject *
+link_send(pylink_t *link, PyObject *args, PyObject *kwds)
+{
+	char *daddr = NULL, *msgbuf = NULL;
+	size_t daddrlen = 0, msglen = 0;
+	t_scalar_t minpri = DL_QOS_DONT_CARE, maxpri = DL_QOS_DONT_CARE;
+	uint_t sap = DLPI_ANY_SAP;
+	dlpi_sendinfo_t ds, *dsp = NULL;
+	static char *keywords[] =
+	    {"destaddr", "message", "sap", "minpri", "maxpri", NULL};
+	int rval;
+
+	if (link->dlpihdl == NULL) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if (!PyArg_ParseTupleAndKeywords(args, kwds, "s#s#|Iii", keywords,
+	    &daddr, &daddrlen, &msgbuf, &msglen, &sap, &minpri, &maxpri))
+		return (NULL);
+
+	if ((sap != DLPI_ANY_SAP) || (minpri != DL_QOS_DONT_CARE) ||
+	    (maxpri != DL_QOS_DONT_CARE)) {
+		ds.dsi_sap = sap;
+		ds.dsi_prio.dl_min = minpri;
+		ds.dsi_prio.dl_max = maxpri;
+		dsp = &ds;
+	}
+
+	if ((rval = dlpi_send(link->dlpihdl, daddr, daddrlen,
+	    msgbuf, msglen, dsp)) != DLPI_SUCCESS) {
+		dlpi_raise_exception(rval);
+		return (NULL);
+	}
+
+	Py_INCREF(Py_None);
+	return (Py_None);
+}
+
+PyDoc_STRVAR(recv_doc,
+    "recv(msglen[, timeout]) -> (string, string), or (None, None)\n"
+    "\n"
+    "Attempts to receive message over this link.\n"
+    "You need to specify the message length for the received message.\n"
+    "And you can specify timeout value in milliseconds.\n"
+    "The default timeout value is -1 (wait forever).\n"
+    "Returns (source address, message data), or (None, None) when error occurs.\n"
+    "See dlpi_recv(3DLPI).\n"
+);
+static PyObject *
+link_recv(pylink_t *link, PyObject *args, PyObject *kwds)
+{
+	PyObject *obj;
+	char *saddr = NULL, *msgbuf = NULL;
+	size_t saddrlen = 0, msglen = 0, *saddrlenp = NULL, *msglenp = NULL;
+	int msec = -1; /* block until receive data */
+	static char *keywords[] = {"msglen", "timeout", NULL};
+	int rval;
+
+	if (link->dlpihdl == NULL) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if (!PyArg_ParseTupleAndKeywords(args, kwds, "k|i",
+	    keywords, &msglen, &msec))
+		return (NULL);
+
+	if (msglen > 0) {
+		msgbuf = malloc(msglen);
+		if (msgbuf == NULL) {
+			dlpi_raise_exception(DL_SYSERR);
+			return (NULL);
+		}
+		saddrlen = DLPI_PHYSADDR_MAX;
+		saddr = malloc(saddrlen);
+		if (saddr == NULL) {
+			dlpi_raise_exception(DL_SYSERR);
+			free(msgbuf);
+			return (NULL);
+		}
+		msglenp = &msglen;
+		saddrlenp = &saddrlen;
+	}
+
+	if ((rval = dlpi_recv(link->dlpihdl, saddr, saddrlenp, msgbuf,
+	    msglenp, msec, NULL)) != DLPI_SUCCESS) {
+		if (msgbuf != NULL)
+			free(msgbuf);
+		if (saddr != NULL)
+			free(saddr);
+		dlpi_raise_exception(rval);
+		return (NULL);
+	}
+
+	obj = Py_BuildValue("s#s#", saddr, saddrlen, msgbuf, msglen);
+	if (msgbuf != NULL)
+		free(msgbuf);
+	if (saddr != NULL)
+		free(saddr);
+	return (obj);
+}
+
+PyDoc_STRVAR(disabmulti_doc,
+    "disabmulti(address) -> None\n"
+    "\n"
+    "Disable a specified multicast address on this link.\n"
+    "See dlpi_disabmulti(3DLPI).\n"
+);
+static PyObject *
+link_disabmulti(pylink_t *link, PyObject *args, PyObject *kwds)
+{
+	char *addr = NULL;
+	size_t addrlen = 0;
+	static char *keywords[] = {"address", NULL};
+	int rval;
+
+	if (link->dlpihdl == NULL) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if (!PyArg_ParseTupleAndKeywords(args, kwds, "s#", keywords,
+	    &addr, &addrlen))
+		return (NULL);
+
+	if ((addrlen == 0) || (addrlen > DLPI_PHYSADDR_MAX)) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if ((rval = dlpi_disabmulti(link->dlpihdl, addr, addrlen)) !=
+	    DLPI_SUCCESS) {
+		dlpi_raise_exception(rval);
+		return (NULL);
+	}
+
+	Py_INCREF(Py_None);
+	return (Py_None);
+}
+
+PyDoc_STRVAR(enabmulti_doc,
+    "enabmulti(address) -> None\n"
+    "\n"
+    "Enable a specified multicast address on this link.\n"
+    "See dlpi_enabmulti(3DLPI).\n"
+);
+static PyObject *
+link_enabmulti(pylink_t *link, PyObject *args, PyObject *kwds)
+{
+	char *addr = NULL;
+	size_t addrlen = 0;
+	static char *keywords[] = {"address", NULL};
+	int rval;
+
+	if (link->dlpihdl == NULL) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if (!PyArg_ParseTupleAndKeywords(args, kwds, "s#", keywords,
+	    &addr, &addrlen))
+		return (NULL);
+
+	if ((addrlen == 0) || (addrlen > DLPI_PHYSADDR_MAX)) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if ((rval = dlpi_enabmulti(link->dlpihdl, addr, addrlen)) !=
+	    DLPI_SUCCESS) {
+		dlpi_raise_exception(rval);
+		return (NULL);
+	}
+
+	Py_INCREF(Py_None);
+	return (Py_None);
+}
+
+static void
+dlpi_callback(dlpi_handle_t hdl, dlpi_notifyinfo_t *ni, void *arg)
+{
+	callback_data_t *cd = (callback_data_t *)arg;
+	PyObject *arglist, *result;
+
+	switch (ni->dni_note) {
+	case DL_NOTE_SPEED:
+		arglist = Py_BuildValue("(OII)",
+		    cd->pyarg, ni->dni_note, ni->dni_speed);
+		break;
+	case DL_NOTE_SDU_SIZE:
+		arglist = Py_BuildValue("(OII)",
+		    cd->pyarg, ni->dni_note, ni->dni_size);
+		break;
+	case DL_NOTE_PHYS_ADDR:
+		arglist = Py_BuildValue("(OIs#)",
+		    cd->pyarg, ni->dni_note, ni->dni_physaddr,
+		    ni->dni_physaddrlen);
+		break;
+	default:
+		arglist = Py_BuildValue("(OIO)", cd->pyarg, ni->dni_note,
+		    Py_None);
+	}
+
+	result = PyEval_CallObject(cd->pyfunc, arglist);
+	Py_DECREF(arglist);
+	if (result == NULL) {
+		PyErr_Clear(); /* cannot raise error */
+	}
+	Py_DECREF(result);
+	Py_DECREF(cd->pyfunc);
+	Py_XDECREF(cd->pyarg);
+	free(cd);
+}
+
+PyDoc_STRVAR(enabnotify_doc,
+    "enabnotify(events, function[, arg]) -> unsigned long\n"
+    "\n"
+    "Enables a notification callback for the set of specified events,\n"
+    "which must be one or more (by a logical OR) events listed as below:\n"
+    "NOTE_LINK_DOWN         Notify when link has gone down\n"
+    "NOTE_LINK_UP           Notify when link has come up\n"
+    "NOTE_PHYS_ADDR         Notify when address changes\n"
+    "NOTE_SDU_SIZE          Notify when MTU changes\n"
+    "NOTE_SPEED             Notify when speed changes\n"
+    "NOTE_PROMISC_ON_PHYS   Notify when PROMISC_PHYS is set\n"
+    "NOTE_PROMISC_OFF_PHYS  Notify when PROMISC_PHYS is cleared\n"
+    "Returns a handle for this registration.\n"
+    "See dlpi_enabnotify(3DLPI).\n"
+);
+static PyObject *
+link_enabnotify(pylink_t *link, PyObject *args, PyObject *kwds)
+{
+	PyObject *func = NULL, *arg = NULL;
+	callback_data_t *cd;
+	uint_t notes = 0;
+	static char *keywords[] = {"events", "function", "arg", NULL};
+	dlpi_notifyid_t id;
+	int rval;
+
+	if (link->dlpihdl == NULL) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if (!PyArg_ParseTupleAndKeywords(args, kwds, "IO|O",
+	    keywords, &notes, &func, &arg))
+		return (NULL);
+
+	if (!PyCallable_Check(func)) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	cd = malloc(sizeof(callback_data_t));
+	if (cd == NULL) {
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+	Py_INCREF(func);
+	Py_XINCREF(arg);
+	cd->pyfunc = func;
+	cd->pyarg = arg;
+
+	if ((rval = dlpi_enabnotify(link->dlpihdl, notes, dlpi_callback,
+	    cd, &id)) != DLPI_SUCCESS) {
+		free(cd);
+		Py_DECREF(func);
+		Py_XDECREF(arg);
+		dlpi_raise_exception(rval);
+		return (NULL);
+	}
+
+	return (Py_BuildValue("k", id));
+}
+
+PyDoc_STRVAR(disabnotify_doc,
+    "disabnotify(handle) -> argument object, or None\n"
+    "\n"
+    "Disables the notification registration associated with handle.\n"
+    "You should get this handle by calling enabnotify().\n"
+    "Returns the argument passed in when registering the callback, or None.\n"
+    "See dlpi_disabnotify(3DLPI).\n"
+);
+static PyObject *
+link_disabnotify(pylink_t *link, PyObject *args, PyObject *kwds)
+{
+	dlpi_notifyid_t id;
+	callback_data_t *arg;
+	PyObject *pyargsaved;
+	static char *keywords[] = {"handle", NULL};
+	int rval;
+
+	if (link->dlpihdl == NULL) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if (!PyArg_ParseTupleAndKeywords(args, kwds, "k", keywords, &id))
+		return (NULL);
+
+	if ((rval = dlpi_disabnotify(link->dlpihdl, id, (void **)&arg)) !=
+	    DLPI_SUCCESS) {
+		dlpi_raise_exception(rval);
+		return (NULL);
+	}
+
+	/* clean up */
+	pyargsaved = arg->pyarg;
+	Py_XINCREF(pyargsaved);
+	Py_XDECREF(arg->pyarg);
+	Py_DECREF(arg->pyfunc);
+	free(arg);
+
+	if (pyargsaved != NULL)
+		return (pyargsaved);
+
+	Py_INCREF(Py_None);
+	return (Py_None);
+}
+
+PyDoc_STRVAR(get_sap_doc,
+    "get_sap() -> unsigned int\n"
+    "\n"
+    "Returns the sap bound to this link.\n"
+    "See dlpi_info(3DLPI).\n"
+);
+static PyObject *
+link_get_sap(pylink_t *link)
+{
+	dlpi_info_t info;
+	int rval;
+
+	if (link->dlpihdl == NULL) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if ((rval = dlpi_info(link->dlpihdl, &info, 0)) !=
+	    DLPI_SUCCESS) {
+		dlpi_raise_exception(rval);
+		return (NULL);
+	}
+
+	return (Py_BuildValue("I", info.di_sap));
+}
+
+PyDoc_STRVAR(get_fd_doc,
+    "get_fd() -> int\n"
+    "\n"
+    "Returns the integer file descriptor that can be used to directly\n"
+    "operate on the link.\n"
+    "See dlpi_fd(3DLPI).\n"
+);
+static PyObject *
+link_get_fd(pylink_t *link)
+{
+	int fd;
+
+	if (link->dlpihdl == NULL) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if ((fd = dlpi_fd(link->dlpihdl)) == -1) {
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	return (Py_BuildValue("i", fd));
+}
+
+PyDoc_STRVAR(get_linkname_doc,
+    "get_linkname() -> string\n"
+    "\n"
+    "Returns the name of the link.\n"
+    "See dlpi_linkname(3DLPI).\n"
+);
+static PyObject *
+link_get_linkname(pylink_t *link)
+{
+	const char *name = NULL;
+
+	if (link->dlpihdl == NULL) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if ((name = dlpi_linkname(link->dlpihdl)) == NULL) {
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	return (Py_BuildValue("s", name));
+}
+
+PyDoc_STRVAR(get_bcastaddr_doc,
+    "get_bcastaddr() -> string, or None\n"
+    "\n"
+    "Returns the broadcast address of the link.\n"
+    "Returns None if the broadcast address is empty.\n"
+    "See dlpi_info(3DLPI).\n"
+);
+static PyObject *
+link_get_bcastaddr(pylink_t *link)
+{
+	char *addr[DLPI_PHYSADDR_MAX];
+	size_t addrlen = 0;
+	dlpi_info_t info;
+	int rval;
+
+	if (link->dlpihdl == NULL) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if ((rval = dlpi_info(link->dlpihdl, &info, 0)) !=
+	    DLPI_SUCCESS) {
+		dlpi_raise_exception(rval);
+		return (NULL);
+	}
+
+	if (info.di_bcastaddrlen == 0) {
+		Py_INCREF(Py_None);
+		return (Py_None);
+	}
+
+	return (Py_BuildValue("s#", info.di_bcastaddr, info.di_bcastaddrlen));
+}
+
+PyDoc_STRVAR(get_physaddr_doc,
+    "get_physaddr(addrtype) -> string, or None\n"
+    "\n"
+    "Addrtype can be any one of the value listed below:\n"
+    "FACT_PHYS_ADDR    Factory physical address\n"
+    "CURR_PHYS_ADDR    Current physical address\n"
+    "Returns the corresponding physical address of the link.\n"
+    "See dlpi_get_physaddr(3DLPI).\n"
+);
+static PyObject *
+link_get_physaddr(pylink_t *link, PyObject *args, PyObject *kwds)
+{
+	char *addr[DLPI_PHYSADDR_MAX];
+	size_t addrlen = DLPI_PHYSADDR_MAX;
+	static char *keywords[] = {"addrtype", NULL};
+	uint_t type;
+	int rval;
+
+	if (link->dlpihdl == NULL) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if (!PyArg_ParseTupleAndKeywords(args, kwds, "I", keywords, &type))
+		return (NULL);
+
+	if ((rval = dlpi_get_physaddr(link->dlpihdl, type, addr, &addrlen)) !=
+	    DLPI_SUCCESS) {
+		dlpi_raise_exception(rval);
+		return (NULL);
+	}
+
+	return (Py_BuildValue("s#", addr, addrlen));
+}
+
+PyDoc_STRVAR(set_physaddr_doc,
+    "set_physaddr(address) -> None\n"
+    "\n"
+    "Sets the physical address of the link.\n"
+    "See dlpi_set_physaddr(3DLPI).\n"
+);
+static PyObject *
+link_set_physaddr(pylink_t *link, PyObject *args, PyObject *kwds)
+{
+	char *addr = NULL;
+	size_t addrlen = 0;
+	static char *keywords[] = {"address", NULL};
+	int rval;
+
+	if (link->dlpihdl == NULL) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if (!PyArg_ParseTupleAndKeywords(args, kwds, "s#", keywords,
+	    &addr, &addrlen))
+		return (NULL);
+
+	if ((rval = dlpi_set_physaddr(link->dlpihdl, DL_CURR_PHYS_ADDR,
+	    addr, addrlen)) != DLPI_SUCCESS) {
+		dlpi_raise_exception(rval);
+		return (NULL);
+	}
+
+	Py_INCREF(Py_None);
+	return (Py_None);
+}
+
+PyDoc_STRVAR(promiscon_doc,
+    "promiscon([level]) -> None\n"
+    "\n"
+    "Enables promiscuous mode for the link at levels:\n"
+    "PROMISC_PHYS     Promiscuous mode at the physical level(default)\n"
+    "PROMISC_SAP      Promiscuous mode at the SAP level\n"
+    "PROMISC_MULTI    Promiscuous mode for all multicast addresses\n"
+    "\n"
+    "The level modifier (OR'd with level) is:\n"
+    "PROMISC_NOLOOP   Do not loopback messages to the client (Solaris only)\n"
+    "See dlpi_promiscon(3DLPI).\n"
+);
+static PyObject *
+link_promiscon(pylink_t *link, PyObject *args, PyObject *kwds)
+{
+	uint_t level = DL_PROMISC_PHYS;
+	static char *keywords[] = {"level", NULL};
+	int rval;
+
+	if (link->dlpihdl == NULL) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if (!PyArg_ParseTupleAndKeywords(args, kwds, "|I", keywords, &level))
+		return (NULL);
+
+	if ((rval = dlpi_promiscon(link->dlpihdl, level)) != DLPI_SUCCESS) {
+		dlpi_raise_exception(rval);
+		return (NULL);
+	}
+
+	Py_INCREF(Py_None);
+	return (Py_None);
+}
+
+PyDoc_STRVAR(promiscoff_doc,
+    "promiscoff([level]) -> None\n"
+    "\n"
+    "Disables promiscuous mode for the link at levels:\n"
+    "PROMISC_PHYS     Promiscuous mode at the physical level(default)\n"
+    "PROMISC_SAP      Promiscuous mode at the SAP level\n"
+    "PROMISC_MULTI    Promiscuous mode for all multicast addresses\n"
+    "\n"
+    "The level modifier (OR'd with level) is:\n"
+    "PROMISC_NOLOOP   Do not loopback messages to the client (Solaris only)\n"
+    "See dlpi_promiscoff(3DLPI).\n"
+);
+static PyObject *
+link_promiscoff(pylink_t *link, PyObject *args, PyObject *kwds)
+{
+	uint_t level = DL_PROMISC_PHYS;
+	static char *keywords[] = {"level", NULL};
+	int rval;
+
+	if (link->dlpihdl == NULL) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if (!PyArg_ParseTupleAndKeywords(args, kwds, "|I", keywords, &level))
+		return (NULL);
+
+	if ((rval = dlpi_promiscoff(link->dlpihdl, level)) != DLPI_SUCCESS) {
+		dlpi_raise_exception(rval);
+		return (NULL);
+	}
+
+	Py_INCREF(Py_None);
+	return (Py_None);
+}
+
+PyDoc_STRVAR(get_timeout_doc,
+    "get_timeout() -> int\n"
+    "\n"
+    "Returns current time out value of the link.\n"
+    "See dlpi_info(3DLPI).\n"
+);
+static PyObject *
+link_get_timeout(pylink_t *link)
+{
+	dlpi_info_t info;
+	int rval;
+
+	if (link->dlpihdl == NULL) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if ((rval = dlpi_info(link->dlpihdl, &info, 0)) !=
+	    DLPI_SUCCESS) {
+		dlpi_raise_exception(rval);
+		return (NULL);
+	}
+
+	return (Py_BuildValue("i", info.di_timeout));
+}
+
+PyDoc_STRVAR(get_mactype_doc,
+    "get_mactype() -> unsigned char\n"
+    "\n"
+    "Returns MAC type of the link.\n"
+    "See <sys/dlpi.h> for the list of possible MAC types.\n"
+    "See dlpi_info(3DLPI).\n"
+);
+static PyObject *
+link_get_mactype(pylink_t *link)
+{
+	dlpi_info_t info;
+	int rval;
+
+	if (link->dlpihdl == NULL) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if ((rval = dlpi_info(link->dlpihdl, &info, 0)) !=
+	    DLPI_SUCCESS) {
+		dlpi_raise_exception(rval);
+		return (NULL);
+	}
+
+	return (Py_BuildValue("B", info.di_mactype));
+}
+
+PyDoc_STRVAR(set_timeout_doc,
+    "set_timeout(timeout) -> None\n"
+    "\n"
+    "Sets time out value of the link (default value: DEF_TIMEOUT).\n"
+    "See dlpi_set_timeout(3DLPI).\n"
+);
+static PyObject *
+link_set_timeout(pylink_t *link, PyObject *args, PyObject *kwds)
+{
+	int timeout = DLPI_DEF_TIMEOUT;
+	static char *keywords[] = {"timeout", NULL};
+	int rval;
+
+	if (link->dlpihdl == NULL) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if (!PyArg_ParseTupleAndKeywords(args, kwds, "i", keywords, &timeout))
+		return (NULL);
+
+	if ((rval = dlpi_set_timeout(link->dlpihdl, timeout)) != DLPI_SUCCESS) {
+		dlpi_raise_exception(rval);
+		return (NULL);
+	}
+
+	Py_INCREF(Py_None);
+	return (Py_None);
+}
+
+PyDoc_STRVAR(get_sdu_doc,
+    "get_sdu() -> (unsigned int, unsigned int)\n"
+    "\n"
+    "Returns (min sdu, max sdu).\n"
+    "See dlpi_info(3DLPI).\n"
+);
+static PyObject *
+link_get_sdu(pylink_t *link)
+{
+	dlpi_info_t info;
+	int rval;
+
+	if (link->dlpihdl == NULL) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if ((rval = dlpi_info(link->dlpihdl, &info, 0)) !=
+	    DLPI_SUCCESS) {
+		dlpi_raise_exception(rval);
+		return (NULL);
+	}
+
+	return (Py_BuildValue("II", info.di_min_sdu, info.di_max_sdu));
+}
+
+PyDoc_STRVAR(get_state_doc,
+    "get_state() -> unsigned int\n"
+    "\n"
+    "Returns current state of the link (either UNBOUND or IDLE).\n"
+    "See dlpi_info(3DLPI).\n"
+);
+static PyObject *
+link_get_state(pylink_t *link)
+{
+	dlpi_info_t info;
+	int rval;
+
+	if (link->dlpihdl == NULL) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if ((rval = dlpi_info(link->dlpihdl, &info, 0)) !=
+	    DLPI_SUCCESS) {
+		dlpi_raise_exception(rval);
+		return (NULL);
+	}
+
+	return (Py_BuildValue("I", info.di_state));
+}
+
+PyDoc_STRVAR(get_qos_select_doc,
+    "get_qos_select() -> (unsigned int, int, int, int)\n"
+    "\n"
+    "Returns (qos type, trans delay, priority, residul err).\n"
+    "Unsupported QOS parameters are set to UNKNOWN.\n"
+    "See dlpi_info(3DLPI).\n"
+);
+static PyObject *
+link_get_qos_select(pylink_t *link)
+{
+	dlpi_info_t info;
+	int rval;
+
+	if (link->dlpihdl == NULL) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if ((rval = dlpi_info(link->dlpihdl, &info, 0)) !=
+	    DLPI_SUCCESS) {
+		dlpi_raise_exception(rval);
+		return (NULL);
+	}
+
+	return (Py_BuildValue("Iiiii",
+	    info.di_qos_sel.dl_qos_type,
+	    info.di_qos_sel.dl_trans_delay,
+	    info.di_qos_sel.dl_priority,
+	    info.di_qos_sel.dl_residual_error));
+}
+
+PyDoc_STRVAR(get_qos_range_doc,
+    "get_qos_range() -> \n"
+    "	(unsigned int, (int, int), (int, int), (int, int), int)\n"
+    "\n"
+    "Returns (qos type, (trans delay target, trans delay accept),\n"
+    "(min priority, max priority), (min protection, max protection),\n"
+    "residual err).\n"
+    "Unsupported QOS range values are set to UNKNOWN.\n"
+    "See dlpi_info(3DLPI).\n"
+);
+static PyObject *
+link_get_qos_range(pylink_t *link)
+{
+	dlpi_info_t info;
+	int rval;
+
+	if (link->dlpihdl == NULL) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	if ((rval = dlpi_info(link->dlpihdl, &info, 0)) !=
+	    DLPI_SUCCESS) {
+		dlpi_raise_exception(rval);
+		return (NULL);
+	}
+
+	return (Py_BuildValue("I(ii)(ii)(ii)i",
+	    info.di_qos_range.dl_qos_type,
+	    info.di_qos_range.dl_trans_delay.dl_target_value,
+	    info.di_qos_range.dl_trans_delay.dl_accept_value,
+	    info.di_qos_range.dl_priority.dl_min,
+	    info.di_qos_range.dl_priority.dl_max,
+	    info.di_qos_range.dl_protection.dl_min,
+	    info.di_qos_range.dl_protection.dl_max,
+	    info.di_qos_range.dl_residual_error));
+}
+
+static PyMethodDef pylink_methods[] = {
+	{"bind", (PyCFunction)link_bind, METH_VARARGS|METH_KEYWORDS, bind_doc},
+	{"unbind", (PyCFunction)link_unbind, METH_NOARGS, unbind_doc},
+	{"send", (PyCFunction)link_send, METH_VARARGS|METH_KEYWORDS,
+	    send_doc},
+	{"recv", (PyCFunction)link_recv, METH_VARARGS|METH_KEYWORDS,
+	    recv_doc},
+	{"disabmulti", (PyCFunction)link_disabmulti, METH_VARARGS|METH_KEYWORDS,
+	    disabmulti_doc},
+	{"enabmulti", (PyCFunction)link_enabmulti, METH_VARARGS|METH_KEYWORDS,
+	    enabmulti_doc},
+	{"enabnotify", (PyCFunction)link_enabnotify,
+	    METH_VARARGS|METH_KEYWORDS, enabnotify_doc},
+	{"disabnotify", (PyCFunction)link_disabnotify,
+	    METH_VARARGS|METH_KEYWORDS, disabnotify_doc},
+	{"get_fd", (PyCFunction)link_get_fd, METH_NOARGS, get_fd_doc},
+	{"get_sap", (PyCFunction)link_get_sap, METH_NOARGS, get_sap_doc},
+	{"get_mactype", (PyCFunction)link_get_mactype, METH_NOARGS,
+	    get_mactype_doc},
+	{"get_linkname", (PyCFunction)link_get_linkname, METH_NOARGS,
+	    get_linkname_doc},
+	{"get_bcastaddr", (PyCFunction)link_get_bcastaddr, METH_NOARGS,
+	    get_bcastaddr_doc},
+	{"get_physaddr", (PyCFunction)link_get_physaddr,
+	    METH_VARARGS|METH_KEYWORDS, get_physaddr_doc},
+	{"set_physaddr", (PyCFunction)link_set_physaddr,
+	    METH_VARARGS|METH_KEYWORDS, set_physaddr_doc},
+	{"promiscon", (PyCFunction)link_promiscon, METH_VARARGS|METH_KEYWORDS,
+	    promiscon_doc},
+	{"promiscoff", (PyCFunction)link_promiscoff, METH_VARARGS|METH_KEYWORDS,
+	    promiscoff_doc},
+	{"get_timeout", (PyCFunction)link_get_timeout, METH_NOARGS,
+	    get_timeout_doc},
+	{"set_timeout", (PyCFunction)link_set_timeout,
+	    METH_VARARGS|METH_KEYWORDS, set_timeout_doc},
+	{"get_sdu", (PyCFunction)link_get_sdu, METH_NOARGS, get_sdu_doc},
+	{"get_state", (PyCFunction)link_get_state, METH_NOARGS,
+	    get_state_doc},
+	{"get_qos_select", (PyCFunction)link_get_qos_select, METH_NOARGS,
+	    get_qos_select_doc},
+	{"get_qos_range", (PyCFunction)link_get_qos_range, METH_NOARGS,
+	    get_qos_range_doc},
+	{NULL, NULL}
+};
+
+static PyTypeObject pylink_type = {
+	PyVarObject_HEAD_INIT(NULL, 0)	/* Must fill in type value later */
+	"dlpi.link",				/* tp_name */
+	sizeof(pylink_t),			/* tp_basicsize */
+	0,					/* tp_itemsize */
+	(destructor)link_dealloc,		/* tp_dealloc */
+	0,					/* tp_print */
+	0,					/* tp_getattr */
+	0,					/* tp_setattr */
+	0,					/* tp_reserved */
+	0,					/* tp_repr */
+	0,					/* tp_as_number */
+	0,					/* tp_as_sequence */
+	0,					/* tp_as_mapping */
+	0,					/* tp_hash */
+	0,					/* tp_call */
+	0,					/* tp_str */
+	0,					/* tp_getattro */
+	0,					/* tp_setattro */
+	0,					/* tp_as_buffer */
+	Py_TPFLAGS_DEFAULT,			/* tp_flags */
+	link_doc,				/* tp_doc */
+	0,					/* tp_traverse */
+	0,					/* tp_clear */
+	0,					/* tp_richcompare */
+	0,					/* tp_weaklistoffset */
+	0,					/* tp_iter */
+	0,					/* tp_iternext */
+	pylink_methods,				/* tp_methods */
+	0,					/* tp_members */
+	0,					/* tp_getset */
+	0,					/* tp_base */
+	0,					/* tp_dict */
+	0,					/* tp_descr_get */
+	0,					/* tp_descr_set */
+	0,					/* tp_dictoffset */
+	(initproc)link_init,			/* tp_init */
+	0,					/* tp_alloc */
+	PyType_GenericNew,			/* tp_new */
+	0,					/* tp_free */
+	0,					/* tp_is_gc */
+};
+
+PyDoc_STRVAR(arptype_doc,
+    "arptype(arptype) -> unsigned int\n"
+    "\n"
+    "Converts a DLPI MAC type to an ARP hardware type defined\n"
+    " in <netinet/arp.h>\n"
+    "See dlpi_arptype(3DLPI)\n"
+);
+static PyObject *
+arptype(PyObject *dlpi, PyObject *args, PyObject *kwds)
+{
+	static char *keywords[] = {"arptype", NULL};
+	uint_t dlpityp, arptyp;
+
+	if (!PyArg_ParseTupleAndKeywords(args, kwds, "I", keywords, &dlpityp))
+		return (NULL);
+
+	if ((arptyp = dlpi_arptype(dlpityp)) == 0) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	return (Py_BuildValue("I", arptyp));
+}
+
+PyDoc_STRVAR(iftype_doc,
+    "iftype(iftype) -> unsigned int\n"
+    "\n"
+    "Converts a DLPI MAC type to a BSD socket interface type\n"
+    "defined in <net/if_types.h>\n"
+    "See dlpi_iftype(3DLPI)\n"
+);
+static PyObject *
+iftype(PyObject *dlpi, PyObject *args, PyObject *kwds)
+{
+	static char *keywords[] = {"iftype", NULL};
+	uint_t dlpityp, iftyp;
+
+	if (!PyArg_ParseTupleAndKeywords(args, kwds, "I", keywords, &dlpityp))
+		return (NULL);
+
+	if ((iftyp = dlpi_iftype(dlpityp)) == 0) {
+		errno = EINVAL;
+		dlpi_raise_exception(DL_SYSERR);
+		return (NULL);
+	}
+
+	return (Py_BuildValue("I", iftyp));
+}
+
+PyDoc_STRVAR(mactype_doc,
+    "mactype(mactype) -> string\n"
+    "\n"
+    "Returns a string that describes the specified mactype.\n"
+    "Valid mac types are defined in <sys/dlpi.h>.\n"
+    "See dlpi_mactype(3DLPI)\n"
+);
+static PyObject *
+mactype(PyObject *dlpi, PyObject *args, PyObject *kwds)
+{
+	static char *keywords[] = {"mactype", NULL};
+	uint_t mactyp;
+
+	if (!PyArg_ParseTupleAndKeywords(args, kwds, "I", keywords, &mactyp))
+		return (NULL);
+
+	return (Py_BuildValue("s", dlpi_mactype(mactyp)));
+}
+
+static boolean_t
+link_walker(const char *name, void *arg)
+{
+	PyObject *linkname;
+	PyObject *list = (PyObject *)arg;
+
+	if ((list == NULL) || !PyList_Check(list))
+		return (_B_FALSE);
+
+	linkname = Py_BuildValue("s", name);
+	if (PyList_Append(list, linkname) == -1)
+		return (_B_TRUE);
+
+	Py_DECREF(linkname);
+	return (_B_FALSE);
+}
+
+PyDoc_STRVAR(listlink_doc,
+    "listlink() -> list\n"
+    "\n"
+    "Returns a list containing link names of all links on the system.\n"
+);
+static PyObject *
+listlink(PyObject *dlpi)
+{
+	PyObject *list;
+
+	if ((list = PyList_New(0)) == NULL)
+		return (NULL);
+
+	dlpi_walk(link_walker, list, 0);
+	return (list);
+}
+
+static PyMethodDef dlpi_methods[] = {
+	{"arptype", (PyCFunction)arptype, METH_VARARGS|METH_KEYWORDS,
+	    arptype_doc},
+	{"iftype", (PyCFunction)iftype, METH_VARARGS|METH_KEYWORDS,
+	    iftype_doc},
+	{"mactype", (PyCFunction)mactype, METH_VARARGS|METH_KEYWORDS,
+	    mactype_doc},
+	{"listlink", (PyCFunction)listlink, METH_NOARGS, listlink_doc},
+	{NULL}
+};
+
+PyMODINIT_FUNC
+PyInit_dlpi (void)
+{
+	PyObject *mod;
+
+	if (PyType_Ready(&pylink_type) < 0)
+		return NULL;
+
+	static struct PyModuleDef moduledef = {
+	    PyModuleDef_HEAD_INIT,
+	    "dlpi",
+	    NULL,
+	    -1,
+	    dlpi_methods,
+	    NULL,
+	    NULL,
+	    NULL,
+	    NULL,
+	};
+
+	mod = PyModule_Create(&moduledef);
+	if (mod == NULL)
+		return NULL;
+
+	dlpi_err = PyErr_NewException("dlpi.error", NULL, NULL);
+	if (dlpi_err == NULL)
+		return NULL;
+	PyModule_AddObject(mod, "error", dlpi_err);
+
+	Py_INCREF(&pylink_type);
+	PyModule_AddObject(mod, "link", (PyObject *)&pylink_type);
+	PyModule_AddIntConstant(mod, "PASSIVE", DLPI_PASSIVE);
+	PyModule_AddIntConstant(mod, "RAW", DLPI_RAW);
+	PyModule_AddIntConstant(mod, "NATIVE", DLPI_NATIVE);
+	PyModule_AddIntConstant(mod, "ANY_SAP", DLPI_ANY_SAP);
+	PyModule_AddIntConstant(mod, "DEF_TIMEOUT", DLPI_DEF_TIMEOUT);
+	PyModule_AddIntConstant(mod, "NOTE_LINK_DOWN", DL_NOTE_LINK_DOWN);
+	PyModule_AddIntConstant(mod, "NOTE_LINK_UP", DL_NOTE_LINK_UP);
+	PyModule_AddIntConstant(mod, "NOTE_PHYS_ADDR", DL_NOTE_PHYS_ADDR);
+	PyModule_AddIntConstant(mod, "NOTE_SDU_SIZE", DL_NOTE_SDU_SIZE);
+	PyModule_AddIntConstant(mod, "NOTE_SPEED", DL_NOTE_SPEED);
+	PyModule_AddIntConstant(mod, "NOTE_PROMISC_ON_PHYS",
+	    DL_NOTE_PROMISC_ON_PHYS);
+	PyModule_AddIntConstant(mod, "NOTE_PROMISC_OFF_PHYS",
+	    DL_NOTE_PROMISC_OFF_PHYS);
+	PyModule_AddIntConstant(mod, "FACT_PHYS_ADDR", DL_FACT_PHYS_ADDR);
+	PyModule_AddIntConstant(mod, "CURR_PHYS_ADDR", DL_CURR_PHYS_ADDR);
+	PyModule_AddIntConstant(mod, "PROMISC_PHYS", DL_PROMISC_PHYS);
+	PyModule_AddIntConstant(mod, "PROMISC_SAP", DL_PROMISC_SAP);
+	PyModule_AddIntConstant(mod, "PROMISC_MULTI", DL_PROMISC_MULTI);
+	/* Not in illumos: PyModule_AddIntConstant(mod, "PROMISC_NOLOOP", DL_PROMISC_NOLOOP); */
+	PyModule_AddIntConstant(mod, "UNKNOWN", DL_UNKNOWN);
+	PyModule_AddIntConstant(mod, "UNBOUND", DL_UNBOUND);
+	PyModule_AddIntConstant(mod, "IDLE", DL_IDLE);
+	PyModule_AddIntConstant(mod, "SYSERR", DL_SYSERR);
+
+	return mod;
+}
--- Python-3.9.1/setup.py
+++ Python-3.9.1/setup.py
@@ -1821,6 +1821,12 @@ class PyBuildExt(build_ext):
         if ucred_inc is not None and tsol_inc is not None:
             self.add(Extension('ucred', ['ucred.c'], libraries=['tsol']))
 
+    def detect_dlpi(self):
+        # dlpi module (Solaris)
+        dlpi_inc = find_file('libdlpi.h', [], self.inc_dirs)
+        if dlpi_inc is not None:
+            self.add(Extension('dlpi', ['dlpimodule.c'], libraries=['dlpi']))
+
     def detect_modules(self):
         self.configure_compiler()
         self.init_inc_lib_dirs()
@@ -1842,6 +1848,7 @@ class PyBuildExt(build_ext):
         self.detect_multibytecodecs()
         self.detect_decimal()
         self.detect_ucred()
+        self.detect_dlpi()
         self.detect_ctypes()
         self.detect_multiprocessing()
         if not self.detect_tkinter():
--- Python-3.9.1/Lib/test/dlpitest.py
+++ Python-3.9.1/Lib/test/dlpitest.py
@@ -0,0 +1,96 @@
+#!/usr/bin/python3.7
+
+import dlpi
+import sys
+import time
+import struct
+
+#test listlink
+linklist = dlpi.listlink()
+print("Found %d links:" % len(linklist))
+print(linklist)
+
+#pick up the first data link for below testing
+linkname = linklist[0]
+
+#open link
+print("opening link: " + linkname + "...")
+testlink = dlpi.link(linkname)
+
+#read some info of testlink
+print("linkname is %s" % testlink.get_linkname())
+print("link fd is %d" % testlink.get_fd())
+mactype = testlink.get_mactype()
+print("dlpi mactype is %d" % mactype)
+print("after convert:")
+print("\tmactype is %s" % dlpi.mactype(mactype))
+print("\tiftype is %d" % dlpi.iftype(mactype))
+print("\tarptype is %d" % dlpi.arptype(mactype))
+bcastaddr = testlink.get_bcastaddr()
+print("broadcast addr is: ", end=' ')
+print(struct.unpack("BBBBBB",bcastaddr))
+physaddr = testlink.get_physaddr(dlpi.FACT_PHYS_ADDR)
+print("factory physical address is: ", end=' ')
+print(struct.unpack("BBBBBB",physaddr))
+print("current timeout value is %d" % testlink.get_timeout())
+print("sdu is:", end=' ')
+print(testlink.get_sdu())
+print("qos select is:", end=' ')
+print(testlink.get_qos_select())
+print("qos range is:", end=' ')
+print(testlink.get_qos_range())
+
+#set some config value of testlink and read them again
+print("setting current physiacal addr to aa:0:10:13:27:5")
+testlink.set_physaddr('\xaa\0\x10\x13\x27\5')
+physaddr = testlink.get_physaddr(dlpi.CURR_PHYS_ADDR)
+print("current physical addr is: ", end=' ')
+print(struct.unpack("BBBBBB",physaddr))
+print("set timeout value to 6...")
+testlink.set_timeout(6)
+print("timeout value is %d" % testlink.get_timeout())
+
+#test enable/disable multicast
+print("enable/disable multicast address 1:0:5e:0:0:5")
+testlink.enabmulti('\1\0\x5e\0\0\5')
+testlink.disabmulti('\1\0\x5e\0\0\5')
+
+#test bind
+print("binding to SAP 0x9000...")
+testlink.bind(0x9000)
+print("sap is %x" % testlink.get_sap())
+print("state is: %d"  % testlink.get_state())
+
+#test send
+print("sending broadcast loopback packet...")
+testlink.send(bcastaddr, '\0\1\2\3\4\5')
+
+#test notify functionality
+arg = "notification callback arg"
+def notify(arg, notes, value):
+	print("NOTE_PROMISC_ON_PHYS notification received with arg: '%s'" % arg)
+print("enabled notification on NOTE_PROMISC_ON_PHYS")
+id = testlink.enabnotify(dlpi.NOTE_PROMISC_ON_PHYS, notify, arg) #enable notification
+testlink.promiscon() #trigger the event (will be seen while receiving pkt below)
+
+#test receive
+print("testing receiving...")
+try:
+	testlink.recv(0, 0) #should see NOTE_PROMISC_ON_PHYS event here
+except dlpi.error as err:
+	errnum, errinfo = err
+	if errnum == 10006:
+		pass #timeout error is expected here
+	else: #test fails if reach here
+		print("test failed", end=' ')
+		print(errnum, end=' ')
+		print(err)
+
+testlink.promiscoff()
+testlink.disabnotify(id) #disable notification
+
+#test unbind
+print("unbinding...")
+testlink.unbind()
+print("sap is %x" % testlink.get_sap())
+print("state is: %d"  % testlink.get_state())