nfs plugin: Copy the name before calling the non-const lookup function.

Fixes Github issue #70. Thanks to Jeff for reporting this issue.

diff --git a/src/nfs.c b/src/nfs.c
index 461e806..1a4ed74 100644 (file)
--- a/src/nfs.c
+++ b/src/nfs.c
@@ -1,6 +1,7 @@
 /**
  * collectd - src/nfs.c
  * Copyright (C) 2005,2006  Jason Pepas
+ * Copyright (C) 2012,2013  Florian Forster
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the
@@ -17,7 +18,7 @@
  *
  * Authors:
  *   Jason Pepas <cell at ices.utexas.edu>
- *   Florian octo Forster <octo at verplant.org>
+ *   Florian octo Forster <octo at collectd.org>
  *   Cosmin Ioiart <cioiart at gmail.com>
  **/
 
@@ -318,7 +319,7 @@ static void nfs_read_linux (FILE *fh, char *inst)
 
 #if HAVE_LIBKSTAT
 static int nfs_read_kstat (kstat_t *ksp, int nfs_version, char *inst,
-               const char **proc_names, size_t proc_names_num)
+               char const **proc_names, size_t proc_names_num)
 {
        char plugin_instance[DATA_MAX_NAME_LEN];
        value_t values[proc_names_num];
@@ -332,8 +333,14 @@ static int nfs_read_kstat (kstat_t *ksp, int nfs_version, char *inst,
 
        kstat_read(kc, ksp, NULL);
        for (i = 0; i < proc_names_num; i++)
-               values[i].counter = (derive_t) get_kstat_value (ksp,
-                               (char *)proc_names[i]);
+       {
+               /* The name passed to kstat_data_lookup() doesn't have the
+                * "const" modifier, so we need to copy the name here. */
+               char name[32];
+               sstrncpy (name, proc_names[i], sizeof (name));
+
+               values[i].counter = (derive_t) get_kstat_value (ksp, name);
+       }
 
        nfs_procedures_submit (plugin_instance, proc_names, values,
                        proc_names_num);