-As default, ALSA behaves as defined in POSIX, i.e. blocks the file
-when it's busy until the device becomes free (unless O_NONBLOCK is
-specified). Some applications assume the non-block open behavior,
-which are actually implemented in some real OSS drivers.
+
+As default, ALSA behaves as original OSS drivers, i.e. does not block
+the file when it's busy. The -EBUSY error is returned in this case.