Merge pull request #16336 from yuwata/ifindex-cleanups

[thirdparty/systemd.git] / man / udev_device_has_tag.xml

diff --git a/man/udev_device_has_tag.xml b/man/udev_device_has_tag.xml
index f34ae9ed370ced22c70e104b7d9e25785756643d..9c64a4b45b9ba4f446ab8b0fa422d5bc04487cad 100644 (file)
--- a/man/udev_device_has_tag.xml
+++ b/man/udev_device_has_tag.xml
@@ -1,13 +1,10 @@
 <?xml version='1.0'?> <!--*-nxml-*-->
-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" [
 <!ENTITY % entities SYSTEM "custom-entities.ent" >
 %entities;
 ]>
-
-<!--
-  SPDX-License-Identifier: LGPL-2.1+
--->
+<!-- SPDX-License-Identifier: LGPL-2.1+ -->
 
 <refentry id="udev_device_has_tag"
   xmlns:xi="http://www.w3.org/2001/XInclude">
@@ -109,12 +106,19 @@
     <function>udev_device_get_property_value()</function> and
     <function>udev_device_get_sysattr_value()</function> return a
     pointer to a constant string of the requested value. On error,
-    <constant>NULL</constant> is returned.</para>
+    <constant>NULL</constant> is returned. Attributes that may
+    contain <constant>NUL</constant> bytes should not be retrieved
+    with <function>udev_device_get_sysattr_value()</function>;
+    instead, read them directly from the files within the device's
+    <property>syspath</property>.</para>
 
     <para>On success,
     <function>udev_device_set_sysattr_value()</function> returns
     an integer greater than, or equal to, <constant>0</constant>.
-    On failure, a negative error code is returned.</para>
+    On failure, a negative error code is returned. Values that
+    contain <constant>NUL</constant> bytes should not be set with
+    this function; instead, write them directly to the files within
+    the device's <property>syspath</property>.</para>
 
     <para>On success, <function>udev_device_has_tag()</function>
     returns <constant>1</constant> or <constant>0</constant>,