udevtest: print header that ENV{} can't work

diff --git a/udevtest.c b/udevtest.c
index d17157c..2854f75 100644 (file)
--- a/udevtest.c
+++ b/udevtest.c
@@ -111,6 +111,11 @@ int main(int argc, char *argv[], char *envp[])
        setenv("SUBSYSTEM", udev->dev->subsystem, 1);
        setenv("ACTION", "add", 1);
 
+       printf("This program is for debugging only, it does not create any node,\n"
+              "or run any program specified by a RUN key. It may show incorrect results,\n"
+              "if rules match against subsystem specfic kernel event variables.\n"
+              "\n");
+
        info("looking at device '%s' from subsystem '%s'", udev->dev->devpath, udev->dev->subsystem);
        retval = udev_device_event(&rules, udev);
        if (retval == 0 && !udev->ignore_device && udev_run) {