From 262bb701c8e79a2234530f832bf9cca6b90303ad Mon Sep 17 00:00:00 2001 From: Florian Forster Date: Tue, 18 Sep 2012 08:29:26 +0200 Subject: [PATCH] snmp plugin: Improve some comments. --- src/snmp.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/src/snmp.c b/src/snmp.c index 2b0b463f..228ed8e2 100644 --- a/src/snmp.c +++ b/src/snmp.c @@ -1009,12 +1009,13 @@ static int csnmp_instance_list_add (csnmp_list_instances_t **head, if (vb == NULL) return (-1); - il = (csnmp_list_instances_t *) malloc (sizeof (csnmp_list_instances_t)); + il = malloc (sizeof (*il)); if (il == NULL) { ERROR ("snmp plugin: malloc failed."); return (-1); } + /* XXX copy entire OID */ il->subid = vb->name[vb->name_length - 1]; il->next = NULL; @@ -1318,7 +1319,8 @@ static int csnmp_read_table (host_definition_t *host, data_definition_t *data) break; } - /* if an instance-OID is configured.. */ + /* Copy the OID of the value used as instance to oid_list, if an instance + * is configured. */ if (data->instance.oid.oid_len > 0) { /* Allocate a new `csnmp_list_instances_t', insert the instance name and @@ -1331,19 +1333,24 @@ static int csnmp_read_table (host_definition_t *host, data_definition_t *data) break; } - /* Set vb on the last variable */ + /* The instance OID is added to the list of OIDs to GET from the + * snmp agent last, so set vb on the last variable returned and copy + * that OID. */ for (vb = res->variables; (vb != NULL) && (vb->next_variable != NULL); vb = vb->next_variable) /* do nothing */; assert (vb != NULL); - /* Copy OID to oid_list[data->values_len] */ + /* Copy the OID of the instance value to oid_list[data->values_len] */ memcpy (oid_list[data->values_len].oid, vb->name, sizeof (oid) * vb->name_length); oid_list[data->values_len].oid_len = vb->name_length; } + /* Iterate over all the (non-instance) values returned by the agent. The + * (i < value_len) check will make sure we're not handling the instance OID + * twice. */ for (vb = res->variables, i = 0; (vb != NULL) && (i < data->values_len); vb = vb->next_variable, i++) -- 2.30.2