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 -- http://palosaari.fi/ -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html