path: root/Documentation
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authorJonathan Corbet <corbet@lwn.net>2008-04-23 10:34:52 -0600
committerJonathan Corbet <corbet@lwn.net>2008-04-24 15:57:32 -0600
commit22c36d18c668db1a8d92a9a47e09857974f6a49b (patch)
tree417f085e0c488aee5fd323c15e99bbc46f00f78a /Documentation
parentb69d3987f4360a5e7e9e55465b3cdd0cc204b79e (diff)
Document SEQ_SKIP
2.6.26 adds a SEQ_SKIP return value for the seq_file show() function; update the documentation to match. Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation')
1 files changed, 7 insertions, 2 deletions
diff --git a/Documentation/filesystems/seq_file.txt b/Documentation/filesystems/seq_file.txt
index 7fb8e6dc62bf..0ab92c260894 100644
--- a/Documentation/filesystems/seq_file.txt
+++ b/Documentation/filesystems/seq_file.txt
@@ -122,8 +122,7 @@ stop() is the place to free it.
Finally, the show() function should format the object currently pointed to
-by the iterator for output. It should return zero, or an error code if
-something goes wrong. The example module's show() function is:
+by the iterator for output. The example module's show() function is:
static int ct_seq_show(struct seq_file *s, void *v)
@@ -132,6 +131,12 @@ something goes wrong. The example module's show() function is:
return 0;
+If all is well, the show() function should return zero. A negative error
+code in the usual manner indicates that something went wrong; it will be
+passed back to user space. This function can also return SEQ_SKIP, which
+causes the current item to be skipped; if the show() function has already
+generated output before returning SEQ_SKIP, that output will be dropped.
We will look at seq_printf() in a moment. But first, the definition of the
seq_file iterator is finished by creating a seq_operations structure with
the four functions we have just defined: