[PATCH] pipe.7: also mention writev(2) in atomicity sexion

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writev(2) notes that buffers don't interleave with other process'
(a reasonable question to ask), but points to pipe(7) for an exception.
pipe(7) did /not/ mention "writev", "iov", "scat", or "gath", which are,
in order, reasonable search terms: this was confusing at best and
alarming at worst

By mentioning writev(2) in the heading, we clearly note that this sort
of interleaving behaviour matches write(2)'s and isn't a concern

Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@xxxxxxxxxxxxxxxxxx>
---
 man7/pipe.7 | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/man7/pipe.7 b/man7/pipe.7
index c3210320c..29f6cf6cb 100644
--- a/man7/pipe.7
+++ b/man7/pipe.7
@@ -246,6 +246,8 @@ limits; see BUGS.
 .SS PIPE_BUF
 POSIX.1 says that
 .BR write (2)s
+and
+.BR writev (2)s
 of less than
 .B PIPE_BUF
 bytes must be atomic: the output data is written to the pipe as a
-- 
2.20.1

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