(pcm_hw.c from /alsa-lib/src/pcm/pcm_hw.c) file=pcm_hw.c:406 function=snd_pcm_hw_status err=25 pcm_hw.c: snd_pcm_hw_status() SNDRV_PCM_IOCTL_STATUS failed.
According to errno.h, #define ENOTTY 25 /* Not a typewriter */
I would think that the following would be a better err result. #define ENODEV 19 /* No such device */ or even #define EPIPE 32 /* Broken pipe */
I have looked through alsa-lib and alsa-kernel and cannot find any place in the code that sets errno to 25!
Can anybody help?
My aim is to let the application detect when a usb audio device is unplugged, so that the application can release all alsa resources.
The application will then poll the alsa-lib trying to open the device again, and continually get errors until the audio usb device is plugged in again. For my application to achieve this, I would need a specific errno for the "usb device unplugged" that will not get confused with over/underruns or other errors that might not be "usb unplugged" related.
Cheers James
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