From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Courtier-Dutton Subject: Strange err=25 result. Date: Wed, 14 Jan 2004 14:09:02 +0000 Sender: alsa-devel-admin@lists.sourceforge.net Message-ID: <40054D7E.5010902@superbug.demon.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: Errors-To: alsa-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: alsa-devel@lists.sourceforge.net List-Id: alsa-devel@alsa-project.org Some debug output from calling snd_pcm_wait() when a USB device is unplugged. (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 ------------------------------------------------------- This SF.net email is sponsored by: Perforce Software. Perforce is the Fast Software Configuration Management System offering advanced branching capabilities and atomic changes on 50+ platforms. Free Eval! http://www.perforce.com/perforce/loadprog.html