swap plugin: Complain if physical and virtual reporting have both been deactivated.

diff --git a/src/swap.c b/src/swap.c
index 03e4eec..a1c78b6 100644 (file)
--- a/src/swap.c
+++ b/src/swap.c
@@ -564,6 +564,13 @@ static int swap_read (void) /* {{{ */
 {
        int status;
 
+       if (!report_physical && !report_virtual)
+       {
+               WARNING ("swap plugin: Neither the \"ReportPhysical\" nor the \"ReportVirtual\" option "
+                               "has been activated. This plugin will not collect any data.");
+               return (-1);
+       }
+
        if (report_physical)
        {
                status = swap_read_swapctl2 ();