lpar plugin: Fix error handling of the "perfstat_partition_total" function.

According to the documentation the function returns -1 on error. The
code now assumes anything but one (the number of structures filled) as
error.

diff --git a/src/lpar.c b/src/lpar.c
index 113dff9..be4738b 100644 (file)
--- a/src/lpar.c
+++ b/src/lpar.c
@@ -190,6 +190,8 @@ static int lpar_read_dedicated_partition (const perfstat_partition_total_t *data
 
        if (data->type.b.donate_enabled)
        {
+               /* FYI:  PURR == Processor Utilization of Resources Register
+                *      SPURR == Scaled PURR */
                lpar_submit ("idle_donated", (counter_t) data->idle_donated_purr);
                lpar_submit ("busy_donated", (counter_t) data->busy_donated_purr);
                lpar_submit ("idle_stolen",  (counter_t) data->idle_stolen_purr);
@@ -202,12 +204,18 @@ static int lpar_read_dedicated_partition (const perfstat_partition_total_t *data
 static int lpar_read (void)
 {
        perfstat_partition_total_t lparstats;
+       int status;
 
-       /* Retrieve the current metrics */
-       if (!perfstat_partition_total (NULL, &lparstats,
-                                      sizeof (perfstat_partition_total_t), 1))
+       /* Retrieve the current metrics. Returns the number of structures filled. */
+       status = perfstat_partition_total (/* name = */ NULL, /* (must be NULL) */
+                       &lparstats, sizeof (perfstat_partition_total_t),
+                       /* number = */ 1 /* (must be 1) */);
+       if (status != 1)
        {
-               ERROR ("lpar plugin: perfstat_partition_total failed.");
+               char errbuf[1024];
+               ERROR ("lpar plugin: perfstat_partition_total failed: %s (%i)",
+                               sstrerror (errno, errbuf, sizeof (errbuf)),
+                               status);
                return (-1);
        }