(Pipe Atomicity): Mention writing might block after PIPE_BUF bytes.

1 files changed, 2 insertions, 1 deletions

diff --git a/manual/pipe.texi b/manual/pipe.texi
index ed5a40214e..64247f17c1 100644
--- a/manual/pipe.texi
+++ b/manual/pipe.texi
@@ -200,7 +200,8 @@ once it does begin, it finishes immediately.
 
 Reading or writing a larger amount of data may not be atomic; for
 example, output data from other processes sharing the descriptor may be
-interspersed.
+interspersed.  Also, once @code{PIPE_BUF} characters have been written,
+further writes will block until some characters are read.
 
 @xref{Limits for Files}, for information about the @code{PIPE_BUF}
 parameter.