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-rw-r--r--Modules/ossaudiodev.c91
1 files changed, 91 insertions, 0 deletions
diff --git a/Modules/ossaudiodev.c b/Modules/ossaudiodev.c
index cdf6bebc16..95a23b7ea3 100644
--- a/Modules/ossaudiodev.c
+++ b/Modules/ossaudiodev.c
@@ -213,6 +213,21 @@ oss_mixer_dealloc(oss_mixer_t *self)
* Helper functions
*/
+/* Check if a given file descriptor is valid (i.e. hasn't been closed).
+ * If true, return 1. Otherwise, raise ValueError and return 0.
+ */
+static int _is_fd_valid(int fd)
+{
+ /* the FD is set to -1 in oss_close()/oss_mixer_close() */
+ if (fd >= 0) {
+ return 1;
+ } else {
+ PyErr_SetString(PyExc_ValueError,
+ "Operation on closed OSS device.");
+ return 0;
+ }
+}
+
/* _do_ioctl_1() is a private helper function used for the OSS ioctls --
SNDCTL_DSP_{SETFMT,CHANNELS,SPEED} -- that that are called from C
like this:
@@ -300,6 +315,9 @@ _do_ioctl_0(int fd, PyObject *args, char *fname, int cmd)
static PyObject *
oss_nonblock(oss_audio_t *self, PyObject *unused)
{
+ if (!_is_fd_valid(self->fd))
+ return NULL;
+
/* Hmmm: it doesn't appear to be possible to return to blocking
mode once we're in non-blocking mode! */
if (ioctl(self->fd, SNDCTL_DSP_NONBLOCK, NULL) == -1)
@@ -311,6 +329,9 @@ oss_nonblock(oss_audio_t *self, PyObject *unused)
static PyObject *
oss_setfmt(oss_audio_t *self, PyObject *args)
{
+ if (!_is_fd_valid(self->fd))
+ return NULL;
+
return _do_ioctl_1(self->fd, args, "setfmt", SNDCTL_DSP_SETFMT);
}
@@ -318,6 +339,10 @@ static PyObject *
oss_getfmts(oss_audio_t *self, PyObject *unused)
{
int mask;
+
+ if (!_is_fd_valid(self->fd))
+ return NULL;
+
if (ioctl(self->fd, SNDCTL_DSP_GETFMTS, &mask) == -1)
return PyErr_SetFromErrno(PyExc_IOError);
return PyLong_FromLong(mask);
@@ -326,30 +351,45 @@ oss_getfmts(oss_audio_t *self, PyObject *unused)
static PyObject *
oss_channels(oss_audio_t *self, PyObject *args)
{
+ if (!_is_fd_valid(self->fd))
+ return NULL;
+
return _do_ioctl_1(self->fd, args, "channels", SNDCTL_DSP_CHANNELS);
}
static PyObject *
oss_speed(oss_audio_t *self, PyObject *args)
{
+ if (!_is_fd_valid(self->fd))
+ return NULL;
+
return _do_ioctl_1(self->fd, args, "speed", SNDCTL_DSP_SPEED);
}
static PyObject *
oss_sync(oss_audio_t *self, PyObject *args)
{
+ if (!_is_fd_valid(self->fd))
+ return NULL;
+
return _do_ioctl_0(self->fd, args, "sync", SNDCTL_DSP_SYNC);
}
static PyObject *
oss_reset(oss_audio_t *self, PyObject *args)
{
+ if (!_is_fd_valid(self->fd))
+ return NULL;
+
return _do_ioctl_0(self->fd, args, "reset", SNDCTL_DSP_RESET);
}
static PyObject *
oss_post(oss_audio_t *self, PyObject *args)
{
+ if (!_is_fd_valid(self->fd))
+ return NULL;
+
return _do_ioctl_0(self->fd, args, "post", SNDCTL_DSP_POST);
}
@@ -364,6 +404,9 @@ oss_read(oss_audio_t *self, PyObject *args)
char *cp;
PyObject *rv;
+ if (!_is_fd_valid(self->fd))
+ return NULL;
+
if (!PyArg_ParseTuple(args, "i:read", &size))
return NULL;
rv = PyBytes_FromStringAndSize(NULL, size);
@@ -391,6 +434,9 @@ oss_write(oss_audio_t *self, PyObject *args)
char *cp;
int rv, size;
+ if (!_is_fd_valid(self->fd))
+ return NULL;
+
if (!PyArg_ParseTuple(args, "y#:write", &cp, &size)) {
return NULL;
}
@@ -422,6 +468,9 @@ oss_writeall(oss_audio_t *self, PyObject *args)
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;
@@ -494,6 +543,9 @@ oss_exit(PyObject *self, PyObject *unused)
static PyObject *
oss_fileno(oss_audio_t *self, PyObject *unused)
{
+ if (!_is_fd_valid(self->fd))
+ return NULL;
+
return PyLong_FromLong(self->fd);
}
@@ -508,6 +560,9 @@ oss_setparameters(oss_audio_t *self, PyObject *args)
int fmt, channels, rate;
PyObject * rv; /* return tuple (fmt, channels, rate) */
+ if (!_is_fd_valid(self->fd))
+ return NULL;
+
if (!PyArg_ParseTuple(args, "iii|i:setparameters",
&wanted_fmt, &wanted_channels, &wanted_rate,
&strict))
@@ -598,6 +653,9 @@ oss_bufsize(oss_audio_t *self, PyObject *unused)
audio_buf_info ai;
int nchannels=0, ssize=0;
+ if (!_is_fd_valid(self->fd))
+ return NULL;
+
if (_ssize(self, &nchannels, &ssize) < 0 || !nchannels || !ssize) {
PyErr_SetFromErrno(PyExc_IOError);
return NULL;
@@ -617,6 +675,9 @@ oss_obufcount(oss_audio_t *self, PyObject *unused)
audio_buf_info ai;
int nchannels=0, ssize=0;
+ if (!_is_fd_valid(self->fd))
+ return NULL;
+
if (_ssize(self, &nchannels, &ssize) < 0 || !nchannels || !ssize) {
PyErr_SetFromErrno(PyExc_IOError);
return NULL;
@@ -637,6 +698,9 @@ oss_obuffree(oss_audio_t *self, PyObject *unused)
audio_buf_info ai;
int nchannels=0, ssize=0;
+ if (!_is_fd_valid(self->fd))
+ return NULL;
+
if (_ssize(self, &nchannels, &ssize) < 0 || !nchannels || !ssize) {
PyErr_SetFromErrno(PyExc_IOError);
return NULL;
@@ -654,6 +718,9 @@ oss_getptr(oss_audio_t *self, PyObject *unused)
count_info info;
int req;
+ if (!_is_fd_valid(self->fd))
+ return NULL;
+
if (self->mode == O_RDONLY)
req = SNDCTL_DSP_GETIPTR;
else
@@ -684,6 +751,9 @@ oss_mixer_close(oss_mixer_t *self, PyObject *unused)
static PyObject *
oss_mixer_fileno(oss_mixer_t *self, PyObject *unused)
{
+ if (!_is_fd_valid(self->fd))
+ return NULL;
+
return PyLong_FromLong(self->fd);
}
@@ -692,6 +762,9 @@ oss_mixer_fileno(oss_mixer_t *self, PyObject *unused)
static PyObject *
oss_mixer_controls(oss_mixer_t *self, PyObject *args)
{
+ if (!_is_fd_valid(self->fd))
+ return NULL;
+
return _do_ioctl_1_internal(self->fd, args, "controls",
SOUND_MIXER_READ_DEVMASK);
}
@@ -699,6 +772,9 @@ oss_mixer_controls(oss_mixer_t *self, PyObject *args)
static PyObject *
oss_mixer_stereocontrols(oss_mixer_t *self, PyObject *args)
{
+ if (!_is_fd_valid(self->fd))
+ return NULL;
+
return _do_ioctl_1_internal(self->fd, args, "stereocontrols",
SOUND_MIXER_READ_STEREODEVS);
}
@@ -706,6 +782,9 @@ oss_mixer_stereocontrols(oss_mixer_t *self, PyObject *args)
static PyObject *
oss_mixer_reccontrols(oss_mixer_t *self, PyObject *args)
{
+ if (!_is_fd_valid(self->fd))
+ return NULL;
+
return _do_ioctl_1_internal(self->fd, args, "reccontrols",
SOUND_MIXER_READ_RECMASK);
}
@@ -715,6 +794,9 @@ oss_mixer_get(oss_mixer_t *self, PyObject *args)
{
int channel, volume;
+ if (!_is_fd_valid(self->fd))
+ return NULL;
+
/* Can't use _do_ioctl_1 because of encoded arg thingy. */
if (!PyArg_ParseTuple(args, "i:get", &channel))
return NULL;
@@ -735,6 +817,9 @@ oss_mixer_set(oss_mixer_t *self, PyObject *args)
{
int channel, volume, leftVol, rightVol;
+ if (!_is_fd_valid(self->fd))
+ return NULL;
+
/* Can't use _do_ioctl_1 because of encoded arg thingy. */
if (!PyArg_ParseTuple(args, "i(ii):set", &channel, &leftVol, &rightVol))
return NULL;
@@ -760,6 +845,9 @@ oss_mixer_set(oss_mixer_t *self, PyObject *args)
static PyObject *
oss_mixer_get_recsrc(oss_mixer_t *self, PyObject *args)
{
+ if (!_is_fd_valid(self->fd))
+ return NULL;
+
return _do_ioctl_1_internal(self->fd, args, "get_recsrc",
SOUND_MIXER_READ_RECSRC);
}
@@ -767,6 +855,9 @@ oss_mixer_get_recsrc(oss_mixer_t *self, PyObject *args)
static PyObject *
oss_mixer_set_recsrc(oss_mixer_t *self, PyObject *args)
{
+ if (!_is_fd_valid(self->fd))
+ return NULL;
+
return _do_ioctl_1(self->fd, args, "set_recsrc",
SOUND_MIXER_WRITE_RECSRC);
}
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