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audio(7I) suggests that applications do the following to get the

Browse source 
device and control pseudo-device:

- first look for the device filename in the environment variable
  AUDIODEV.

- if not found, use /dev/audio

- calculate the control device by tacking "ctl" onto the base device
  name.

We now do this.  Also, if the open fails, we call
PyErr_SetFromErrnoWithFilename() to give a more informative error
message.

Added a fileno() method to the audio object returned from open().
This returns the file descriptor which can be used by applications to
set up SIGPOLL notification, as per the manpage.
This commit is contained in:
Barry Warsaw 1998-10-31 22:52:54 +00:00
parent 2c8b35bdd2
commit b0d1b068d9
1 changed files with 43 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

51
Modules/sunaudiodev.c
View file

@ -79,6 +79,7 @@ static PyObject *SunAudioError;
#define is_sadobject(v) ((v)->ob_type == &Sadtype)
#define is_sadstatusobject(v) ((v)->ob_type == &Sadstatustype)
static sadobject *
newsadobject(arg)
PyObject *arg;
@ -87,6 +88,9 @@ newsadobject(arg)
int fd;
char *mode;
int imode;
char* basedev;
char* ctldev;
char* opendev;
/* Check arg for r/w/rw */
if (!PyArg_Parse(arg, "s", &mode))
@ -105,16 +109,34 @@ newsadobject(arg)
return NULL;
}
/* Open the correct device */
if (imode < 0)
/* XXXX Check that this works */
fd = open("/dev/audioctl", 2);
else
fd = open("/dev/audio", imode);
if (fd < 0) {
PyErr_SetFromErrno(SunAudioError);
/* Open the correct device. The base device name comes from the
* AUDIODEV environment variable first, then /dev/audio. The
* control device tacks "ctl" onto the base device name.
*/
basedev = getenv("AUDIODEV");
if (!basedev)
basedev = "/dev/audio";
ctldev = PyMem_NEW(char, strlen(basedev) + 4);
if (!ctldev) {
PyErr_NoMemory();
return NULL;
}
strcpy(ctldev, basedev);
strcat(ctldev, "ctl");
if (imode < 0) {
opendev = ctldev;
fd = open(ctldev, 2);
}
else {
opendev = basedev;
fd = open(basedev, imode);
}
if (fd < 0) {
PyErr_SetFromErrnoWithFilename(SunAudioError, opendev);
return NULL;
}
PyMem_DEL(ctldev);
/* Create and initialize the object */
xp = PyObject_NEW(sadobject, &Sadtype);
@ -344,6 +366,18 @@ sad_close(self, args)
return Py_None;
}
static PyObject *
sad_fileno(self, args)
sadobject *self;
PyObject *args;
{
if (!PyArg_Parse(args, ""))
return NULL;
return PyInt_FromLong(self->x_fd);
}
static PyMethodDef sad_methods[] = {
{ "read", (PyCFunction)sad_read },
{ "write", (PyCFunction)sad_write },
@ -358,6 +392,7 @@ static PyMethodDef sad_methods[] = {
{ "getdev", (PyCFunction)sad_getdev },
#endif
{ "close", (PyCFunction)sad_close },
{ "fileno", (PyCFunction)sad_fileno },
{NULL, NULL} /* sentinel */
};