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Diffstat (limited to 'manual/llio.texi')
| -rw-r--r-- | manual/llio.texi | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/manual/llio.texi b/manual/llio.texi index c196119956..259d11de96 100644 --- a/manual/llio.texi +++ b/manual/llio.texi @@ -935,7 +935,8 @@ random-access files, all append-type output streams are effectively linked to each other. @cindex cleaning up a stream -If you have been using a stream for I/O, and you want to do I/O using +If you have been using a stream for I/O (or have just opened the stream), +and you want to do I/O using another channel (either a stream or a descriptor) that is linked to it, you must first @dfn{clean up} the stream that you have been using. @xref{Cleaning Streams}. @@ -1007,7 +1008,8 @@ You can skip the @code{fclean} or @code{fflush} if you know the stream is already clean. A stream is clean whenever its buffer is empty. For example, an unbuffered stream is always clean. An input stream that is at end-of-file is clean. A line-buffered stream is clean when the last -character output was a newline. +character output was a newline. However, a just-opened input stream +might not be clean, as its input buffer might not be empty. There is one case in which cleaning a stream is impossible on most systems. This is when the stream is doing input from a file that is not |