add option --version to udevd

udevd.8

@@ -14,7 +14,7 @@
 udevd \- event managing daemon
 .SH "SYNOPSIS"
 .HP 6
-\fBudevd\fR [\fB\-\-daemon\fR] [\fB\-\-debug\-trace\fR] [\fB\-\-verbose\fR] [\fB\-\-help\fR]
+\fBudevd\fR [\fB\-\-daemon\fR] [\fB\-\-debug\-trace\fR] [\fB\-\-verbose\fR] [\fB\-\-version\fR] [\fB\-\-help\fR]
 .HP 20
 \fBudevcontrol \fR\fB\fIcommand\fR\fR
 .SH "DESCRIPTION"
@@ -37,6 +37,11 @@ Run all events completely serialized. This may be useful if udev triggers action
 Print log messages to stdout.
 .RE
 .PP
+\fB\-\-version\fR
+.RS 4
+Print version number.
+.RE
+.PP
 \fB\-\-help\fR
 .RS 4
 Print usage.

udevd.c

@@ -943,6 +943,7 @@ int main(int argc, char *argv[], char *envp[])
 		{ "debug-trace", 0, NULL, 't' },
 		{ "verbose", 0, NULL, 'v' },
 		{ "help", 0, NULL, 'h' },
+		{ "version", 0, NULL, 'V' },
 		{}
 	};
 	int rc = 1;
@@ -955,7 +956,7 @@ int main(int argc, char *argv[], char *envp[])
 
 	/* parse commandline options */
 	while (1) {
-		option = getopt_long(argc, argv, "dtvh", options, NULL);
+		option = getopt_long(argc, argv, "dtvhV", options, NULL);
 		if (option == -1)
 			break;
 
@@ -972,7 +973,10 @@ int main(int argc, char *argv[], char *envp[])
 				udev_log_priority = LOG_INFO;
 			break;
 		case 'h':
-			printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--verbose]\n");
+			printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--verbose] [--version]\n");
+			goto exit;
+		case 'V':
+			printf("%s\n", UDEV_VERSION);
 			goto exit;
 		default:
 			goto exit;

udevd.xml

@@ -28,6 +28,7 @@
           <arg><option>--daemon</option></arg>
           <arg><option>--debug-trace</option></arg>
           <arg><option>--verbose</option></arg>
+          <arg><option>--version</option></arg>
           <arg><option>--help</option></arg>
         </cmdsynopsis>
         <cmdsynopsis>
@@ -64,6 +65,12 @@
               <para>Print log messages to stdout.</para>
             </listitem>
           </varlistentry>
+          <varlistentry>
+            <term><option>--version</option></term>
+            <listitem>
+              <para>Print version number.</para>
+            </listitem>
+          </varlistentry>
           <varlistentry>
             <term><option>--help</option></term>
             <listitem>