snd_pcm_plugin_status()
Get the runtime status of a PCM channel (plugin aware)
Synopsis:
#include <sys/asoundlib.h>
int snd_pcm_plugin_status( snd_pcm_t *handle,
snd_pcm_channel_status_t *status );
Arguments:
- handle
- The handle for the PCM device, which you must have opened by calling snd_pcm_open_name(), snd_pcm_open(), or snd_pcm_open_preferred().
- status
- A pointer to a
snd_pcm_channel_status_t
structure that snd_pcm_plugin_status() fills with information
about the PCM channel's status.
Fill in the status structure's channel member to specify the direction. All other members are read-only.
Library:
libasound.so
Use the -l asound option with qcc to link against this library.
Description:
The snd_pcm_plugin_status() function fills the status structure with runtime status information about the PCM channel selected by handle.
Returns:
EOK on success, a negative errno upon failure. The errno values are available in the errno.h file.
Errors:
- -EBADFD
- The pcm device state isn't ready.
- -EFAULT
- Failed to copy data.
- -EINVAL
- Invalid handle or the data pointer is NULL.
Classification:
QNX Neutrino
| Safety: | |
|---|---|
| Cancellation point | No |
| Interrupt handler | No |
| Signal handler | Yes |
| Thread | Read the Caveats |
Caveats:
This function is not thread safe if handle (snd_pcm_t) is used across multiple threads.
This function is the plugin-aware version of snd_pcm_channel_status() . It functions exactly the same way. However, make sure that you don't mix and match plugin- and nonplugin-aware functions in your application, or you may get undefined behavior and misleading results.