diff -r ff2dac607b41 Modules/ossaudiodev.c
--- a/Modules/ossaudiodev.c	Fri Mar 20 00:27:28 2015 +0100
+++ b/Modules/ossaudiodev.c	Fri Mar 20 00:29:44 2015 +0100
@@ -48,12 +48,12 @@ typedef unsigned long uint32_t;
 
 typedef struct {
     PyObject_HEAD
-    char    *devicename;              /* name of the device file */
-    int      fd;                      /* file descriptor */
-    int      mode;                    /* file mode (O_RDONLY, etc.) */
-    int      icount;                  /* input count */
-    int      ocount;                  /* output count */
-    uint32_t afmts;                   /* audio formats supported by hardware */
+    char      *devicename;            /* name of the device file */
+    int        fd;                    /* file descriptor */
+    int        mode;                  /* file mode (O_RDONLY, etc.) */
+    Py_ssize_t icount;                /* input count */
+    Py_ssize_t ocount;                /* output count */
+    uint32_t   afmts;                 /* audio formats supported by hardware */
 } oss_audio_t;
 
 typedef struct {
@@ -399,15 +399,14 @@ oss_post(oss_audio_t *self, PyObject *ar
 static PyObject *
 oss_read(oss_audio_t *self, PyObject *args)
 {
-    int size, count;
+    Py_ssize_t size, count;
     PyObject *rv;
 
     if (!_is_fd_valid(self->fd))
         return NULL;
 
-    if (!PyArg_ParseTuple(args, "i:read", &size))
+    if (!PyArg_ParseTuple(args, "n:read", &size))
         return NULL;
-
     rv = PyBytes_FromStringAndSize(NULL, size);
     if (rv == NULL)
         return NULL;
@@ -426,17 +425,17 @@ oss_read(oss_audio_t *self, PyObject *ar
 static PyObject *
 oss_write(oss_audio_t *self, PyObject *args)
 {
-    char *cp;
-    int rv, size;
+    Py_buffer buf;
+    Py_ssize_t rv;
 
     if (!_is_fd_valid(self->fd))
         return NULL;
 
-    if (!PyArg_ParseTuple(args, "y#:write", &cp, &size)) {
+    if (!PyArg_ParseTuple(args, "y*:write", &buf))
         return NULL;
-    }
 
-    rv = _Py_write(self->fd, cp, size);
+    rv = _Py_write(self->fd, buf.buf, buf.len);
+    PyBuffer_Release(&buf);
     if (rv == -1)
         return NULL;
 
@@ -447,10 +446,12 @@ oss_write(oss_audio_t *self, PyObject *a
 static PyObject *
 oss_writeall(oss_audio_t *self, PyObject *args)
 {
+    Py_buffer buf;
     char *cp;
-    int rv, size;
+    Py_ssize_t size, rv;
     fd_set write_set_fds;
     int select_rv;
+    PyObject *res = NULL;
 
     /* NB. writeall() is only useful in non-blocking mode: according to
        Guenter Geiger <geiger@xdv.org> on the linux-audio-dev list
@@ -462,13 +463,15 @@ oss_writeall(oss_audio_t *self, PyObject
     if (!_is_fd_valid(self->fd))
         return NULL;
 
-    if (!PyArg_ParseTuple(args, "y#:write", &cp, &size))
+    if (!PyArg_ParseTuple(args, "y*:write", &buf))
         return NULL;
+    cp = buf.buf;
+    size = buf.len;
 
     if (!_PyIsSelectable_fd(self->fd)) {
         PyErr_SetString(PyExc_ValueError,
                         "file descriptor out of range for select");
-        return NULL;
+        goto finally;
     }
     /* use select to wait for audio device to be available */
     FD_ZERO(&write_set_fds);
@@ -479,9 +482,11 @@ oss_writeall(oss_audio_t *self, PyObject
         select_rv = select(self->fd+1, NULL, &write_set_fds, NULL, NULL);
         Py_END_ALLOW_THREADS
 
-        assert(select_rv != 0);   /* no timeout, can't expire */
-        if (select_rv == -1)
-            return PyErr_SetFromErrno(PyExc_IOError);
+        assert(select_rv != 0);         /* no timeout, can't expire */
+        if (select_rv == -1) {
+            PyErr_SetFromErrno(PyExc_IOError);
+            goto finally;
+        }
 
         rv = _Py_write(self->fd, cp, size);
         if (rv == -1) {
@@ -491,7 +496,7 @@ oss_writeall(oss_audio_t *self, PyObject
                 continue;
             }
             /* it's a real error */
-            return NULL;
+            goto finally;
         }
 
         /* wrote rv bytes */
@@ -499,8 +504,14 @@ oss_writeall(oss_audio_t *self, PyObject
         size -= rv;
         cp += rv;
     }
+    PyBuffer_Release(&buf);
+
     Py_INCREF(Py_None);
-    return Py_None;
+    res = Py_None;
+
+finally:
+    PyBuffer_Release(&buf);
+    return res;
 }
 
 static PyObject *