doc: test-writing-guidelines
Add paragraph to describe two new tst_ interfaces: tst_strsig and tst_strerrno.
Signed-off-by: Xiaoguang Wang <wangxg.fnst@cn.fujitsu.com>
diff --git a/doc/test-writing-guidelines.txt b/doc/test-writing-guidelines.txt
index bf129a3..7cdaf2f 100644
--- a/doc/test-writing-guidelines.txt
+++ b/doc/test-writing-guidelines.txt
@@ -435,6 +435,21 @@
reported by the 'tst_resm()' interfaces were stored and are used for the exit
value.
+[source,c]
+-------------------------------------------------------------------------------
+const char *tst_strsig(int sig);
+-------------------------------------------------------------------------------
+
+Return the given signal number's corresponding string.
+
+
+[source,c]
+-------------------------------------------------------------------------------
+const char *tst_strerrno(int err);
+-------------------------------------------------------------------------------
+
+Return the given errno number's corresponding string.
+
2.2.3 Test temporary directory
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^