Fix description of user provided write function

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

diff --git a/ChangeLog b/ChangeLog
index 41e6190..3ccd2f7 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2012-04-12  Petr Baudis  <pasky@ucw.cz>
+
+       [BZ #2074]
+       * stdio.texi (Hook Functions): The user provided writer function
+       is not allowed to return -1.
+
 2012-04-11  David S. Miller  <davem@davemloft.net>
 
        * sysdeps/sparc/fpu/libm-test-ulps: Update.

diff --git a/manual/stdio.texi b/manual/stdio.texi
index e870afb..c58ca22 100644 (file)
--- 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: