cvs commit: src/sys/dev/sound/pcm dsp.c mixer.c sound.c sound.h

[Ariff Abdullah]

ariff       2006-03-21 06:35:48 UTC

  FreeBSD src repository

  Modified files:
    sys/dev/sound/pcm    dsp.c mixer.c sound.c sound.h 
  Log:
  Apply more thorough fixes while dealing with device opening and closing:
  
  - Determine open direction using 'flags', not 'mode'. This bug exist since
    past 4 years.
  - Don't allow opening the same device twice, be it in a same or different
    direction.
  - O_RDWR is allowed, provided that it is done by a single open (for example
    by mixer(8)) and the underlying hardware support true full-duplex operation.
  - Do various paranoid checking in case other process/thread trying to hijack
    the same device twice (or more).
  
  MFC after:      5 days
  
  Revision  Changes    Path
  1.94      +73 -91    src/sys/dev/sound/pcm/dsp.c
  1.49      +13 -1     src/sys/dev/sound/pcm/mixer.c
  1.101     +188 -92   src/sys/dev/sound/pcm/sound.c
  1.68      +1 -1      src/sys/dev/sound/pcm/sound.h