--- IO-AIO/AIO.pm	2005/07/31 21:21:12	1.25
+++ IO-AIO/AIO.pm	2005/08/07 03:34:07	1.26
@@ -154,10 +154,6 @@
 
 =item aio_readahead $fh,$offset,$length, $callback
 
-Asynchronously reads the specified byte range into the page cache, using
-the C<readahead> syscall. If that syscall doesn't exist (likely if your OS
-isn't Linux) the status will be C<-1> and C<$!> is set to C<ENOSYS>.
-
 C<aio_readahead> populates the page cache with data from a file so that
 subsequent reads from that file will not block on disk I/O. The C<$offset>
 argument specifies the starting point from which data is to be read and
@@ -167,6 +163,9 @@
 (off-set+length). C<aio_readahead> does not read beyond the end of the
 file. The current file offset of the file is left unchanged.
 
+If that syscall doesn't exist (likely if your OS isn't Linux) it will be
+emulated by simply reading the data, which would have a similar effect.
+
 =item aio_stat  $fh_or_path, $callback
 
 =item aio_lstat $fh, $callback
@@ -202,8 +201,10 @@
 =item aio_fdatasync $fh, $callback
 
 Asynchronously call fdatasync on the given filehandle and call the
-callback with the fdatasync result code. Might set C<$!> to C<ENOSYS> if
-C<fdatasync> is not available.
+callback with the fdatasync result code.
+
+If this call isn't available because your OS lacks it or it couldn't be
+detected, it will be emulated by calling C<fsync> instead.
 
 =back