On Aug 8 2016 16:10, Takashi Iwai wrote: >> _IOC_SIZE macro pick up 13 or 14 bits (architecture-dependent) in ioctl >> command, which represents the size of argument. In my patch, the size of >> 'union ioctl_arg' is 188 (x86/x32) or 192 (x86_64) and there's enough >> rest of the size field. So we can pick up the size from ioctl command by >> the macro because the size represents the maximum bytes of argument for >> all of sequencer ioctls. > > It's not only about the size. It contains the r/w bits, so you can > avoid the unnecessary user-copy calls, too. SET_QUEUE_CLIENT ioctl command is defined as 'W', while a corresponding function writes to userspace. This is unavoidable bug. Regards Takashi Sakamoto _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
