static PyObject *
oss_writeall(oss_audio_t *self, PyObject *args)
{
char *cp;
int rv, size;
fd_set write_set_fds;
int select_rv;
/* NB. writeall() is only useful in non-blocking mode: according to
Guenter Geiger <*****@*****.**> on the linux-audio-dev list
(http://eca.cx/lad/2002/11/0380.html), OSS guarantees that
write() in blocking mode consumes the whole buffer. In blocking
mode, the behaviour of write() and writeall() from Python is
indistinguishable. */
if (!_is_fd_valid(self->fd))
return NULL;
if (!PyArg_ParseTuple(args, "y#:write", &cp, &size))
return NULL;
if (!_PyIsSelectable_fd(self->fd)) {
PyErr_SetString(PyExc_ValueError,
"file descriptor out of range for select");
return NULL;
}
/* use select to wait for audio device to be available */
FD_ZERO(&write_set_fds);
FD_SET(self->fd, &write_set_fds);
while (size > 0) {
Py_BEGIN_ALLOW_THREADS
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);
Py_BEGIN_ALLOW_THREADS
rv = write(self->fd, cp, size);
Py_END_ALLOW_THREADS
if (rv == -1) {
if (errno == EAGAIN) { /* buffer is full, try again */
errno = 0;
continue;
} else /* it's a real error */
return PyErr_SetFromErrno(PyExc_IOError);
} else { /* wrote rv bytes */
self->ocount += rv;
size -= rv;
cp += rv;
}
}
Py_INCREF(Py_None);
return Py_None;
}
static PyObject *
oss_writeall(oss_audio_t *self, PyObject *args)
{
Py_buffer data;
const char *cp;
Py_ssize_t size;
Py_ssize_t rv;
fd_set write_set_fds;
int select_rv;
/* NB. writeall() is only useful in non-blocking mode: according to
Guenter Geiger <*****@*****.**> on the linux-audio-dev list
(http://eca.cx/lad/2002/11/0380.html), OSS guarantees that
write() in blocking mode consumes the whole buffer. In blocking
mode, the behaviour of write() and writeall() from Python is
indistinguishable. */
if (!_is_fd_valid(self->fd))
return NULL;
if (!PyArg_ParseTuple(args, "y*:writeall", &data))
return NULL;
if (!_PyIsSelectable_fd(self->fd)) {
PyErr_SetString(PyExc_ValueError,
"file descriptor out of range for select");
PyBuffer_Release(&data);
return NULL;
}
/* use select to wait for audio device to be available */
FD_ZERO(&write_set_fds);
FD_SET(self->fd, &write_set_fds);
cp = (const char *)data.buf;
size = data.len;
while (size > 0) {
Py_BEGIN_ALLOW_THREADS
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) {
PyBuffer_Release(&data);
return PyErr_SetFromErrno(PyExc_OSError);
}
rv = _Py_write(self->fd, cp, Py_MIN(size, INT_MAX));
if (rv == -1) {
/* buffer is full, try again */
if (errno == EAGAIN) {
PyErr_Clear();
continue;
}
/* it's a real error */
PyBuffer_Release(&data);
return NULL;
}
/* wrote rv bytes */
self->ocount += rv;
size -= rv;
cp += rv;
}
PyBuffer_Release(&data);
Py_RETURN_NONE;
}
