Fix BZ # 2074

[Andreas Jaeger]

There's been a lengthy discussion in bugzilla around bz#2074 which ended
with the conclusion that the documentation for the write function used with
fopencookie must not return a negative value.

Fixed with the appended patch.

Ok to commit?

Andreas

2012-04-11  Petr Baudis  <pasky@ucw.cz>

	[BZ #2074]
	* stdio.texi (Hook Functions): The user provided writer function
	is not allowed to return -1.

diff --git a/manual/stdio.texi b/manual/stdio.texi
index e870afb..c58ca22 100644
--- a/manual/stdio.texi
+++ b/manual/stdio.texi
@@ -5021,7 +5021,8 @@ ssize_t @var{writer} (void *@var{cookie}, const char *@var{buffer}, size_t @var{
 This is very similar to the @code{write} function; see @ref{I/O
 Primitives}.  Your function should transfer up to @var{size} bytes from
 the buffer, and return the number of bytes written.  You can return a
-value of @code{-1} to indicate an error.
+value of @code{0} to indicate an error.  You must not return any
+negative value.
 
 You should define the function to perform seek operations on the cookie
 as:

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