Bug #4053: too many of "error 1236: 'binlog truncated in the middle of event' from master"

- Fix my_read/my_write to handle return values from read/write correctly
- Add debugging 'deprecated function' warning to my_lread/my_lwrite
- Add debugging 'error, read/write interrupt not handled' warning to my_quick_read/my_quick_write

There is no test case associated with these changes.  However, this is a conservative change,
and no repeatable test case is available.


mysys/my_lread.c:
  Warn about using deprecated function.
mysys/my_lwrite.c:
  Warn about using deprecated function.
mysys/my_pread.c:
  Handle interrupted read() or write() (EINTR) properly
mysys/my_quick.c:
  Warn about interrupted read() or write(), which is not
  handled by my_quick_read() or my_quick_write().
mysys/my_read.c:
  Handle interrupted read() (EINTR) properly
mysys/my_write.c:
  Handle interrupted write() (EINTR) properly

1 files changed, 2 insertions, 0 deletions

diff --git a/mysys/my_lwrite.c b/mysys/my_lwrite.c
index e1a3decd053..cfdbd5d4576 100644
--- a/mysys/my_lwrite.c
+++ b/mysys/my_lwrite.c
@@ -26,6 +26,8 @@ uint32 my_lwrite(int Filedes, const byte *Buffer, uint32 Count, myf MyFlags)
   DBUG_PRINT("my",("Fd: %d  Buffer: %lx  Count: %ld  MyFlags: %d",
 		   Filedes, Buffer, Count, MyFlags));
 
+  DBUG_PRINT("error", ("Deprecated my_lwrite() function should not be used."));
+
   /* Temp hack to get count to int32 while write wants int */
   if ((writenbytes = (uint32) write(Filedes, Buffer, (uint) Count)) != Count)
   {