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Date: Sun, 12 Aug 2012 19:38:46 +0300
From: Antti Palosaari <crope@iki.fi>
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Subject: suitable IOCTL error code when device is in state IOCTL cannot performed
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Subject says it all. Which one error value is most suitable / generic ?

Here are few ones I found which could be possible:

#define EPERM        1  /* Operation not permitted */
#define EAGAIN      11  /* Try again */
#define EACCES      13  /* Permission denied */
#define EBUSY       16  /* Device or resource busy */
#define ENODATA     61  /* No data available */
#define ECANCELED   125 /* Operation Canceled */

regards
Antti

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http://palosaari.fi/