Fix README

1 files changed, 20 insertions, 5 deletions

diff --git a/README b/README
index 1bcd0f9..153038d 100644
--- a/README
+++ b/README
@@ -30,13 +30,14 @@ PCM
     conversion, rate conversion, etc, and no external plug-in
   o Accepts the limited PCM name, "hw", "default", "default:x",
     and "hw:x,y,z"
-  o snd_pcm_mmap_read/write*() aren't included
-  o No async handler
+  o snd_pcm_mmap_read/write*() are declared but not implemented
+    (returns -ENXIO)
+  o No async handler (returns -ENXIO)
 
 CONTROL
   o Supports only the hw layer, no plug-in
   o Some H-control functions are not included
-  o No async handler
+  o No async handler (returns -ENXIO)
 
 MIXER
   o No sort with weight as default, sorted in the order of numid
@@ -47,8 +48,8 @@ MIXER
   o No linear <-> log dB conversion
 
 TIMER
-  o No query interface
-  o No async handler
+  o No query interface (returns errors)
+  o No async handler (returns -ENXIO)
   o Disabled as default
 
 RAWMIDI
@@ -120,6 +121,20 @@ DOCUMENTATION
 See alsa-lib reference.  It's compatible!
 
 
+KNOWN PROBLEMS
+--------------
+
+- SALSA-lib headers can't be included from C++
+
+  The codes in *_macros.h contain many conversions to void pointer,
+  which C++ doesn't allow.  I wont'fix this since I don't like C++.
+
+- Incomplete MMAP mode
+
+  snd_pcm_mmap_*() are not implemented, and the mmap-mode is less
+  tested, so far.
+
+
 LICENSE
 -------