processes: warn about process names above OS limit

Fixes #1284

diff --git a/src/collectd.conf.pod b/src/collectd.conf.pod
index d856d21..3b7b9e6 100644 (file)
--- a/src/collectd.conf.pod
+++ b/src/collectd.conf.pod
@@ -4796,6 +4796,9 @@ collected for these selected processes are size of the resident segment size
 (RSS), user- and system-time used, number of processes and number of threads,
 io data (where available) and minor and major pagefaults.
 
+Some platforms have a limit on the length of process names. I<Name> must stay
+below this limit.
+
 =item B<ProcessMatch> I<name> I<regex>
 
 Similar to the B<Process> option this allows to select more detailed

diff --git a/src/processes.c b/src/processes.c
index 8648614..b777515 100644 (file)
--- a/src/processes.c
+++ b/src/processes.c
@@ -546,6 +546,10 @@ static int ps_config (oconfig_item_t *ci)
 {
        int i;
 
+#if KERNEL_LINUX
+       const size_t max_procname_len = 15;
+#endif
+
        for (i = 0; i < ci->children_num; ++i) {
                oconfig_item_t *c = ci->children + i;
 
@@ -566,6 +570,15 @@ static int ps_config (oconfig_item_t *ci)
                                                c->children_num, c->values[0].value.string);
                        }
 
+#if KERNEL_LINUX
+                       if (strlen (c->values[0].value.string) > max_procname_len) {
+                               WARNING ("processes plugin: this platform has a %lu character limit "
+                                               "to process names. The `Process \"%s\"' option will "
+                                               "not work as expected.",
+                                               max_procname_len, c->values[0].value.string);
+                       }
+#endif
+
                        ps_list_register (c->values[0].value.string, NULL);
                }
                else if (strcasecmp (c->key, "ProcessMatch") == 0)