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authorguy <guy>2001-07-29 01:22:40 +0000
committerguy <guy>2001-07-29 01:22:40 +0000
commit11c1cf8ee2404e010992586edd4335aec0e5c719 (patch)
tree9703a57278d0ab5723f2cfc331115dce72e57f0a /pcap-dlpi.c
parenta891a1d5d0814a9ffa8227bf37b9d2680b30414d (diff)
Add comments to "pcap_stats()" indicating what the counters mean on the
various platforms (assuming the vendors' documentation is correct and that I've correctly interpreted it).
Diffstat (limited to 'pcap-dlpi.c')
-rw-r--r--pcap-dlpi.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/pcap-dlpi.c b/pcap-dlpi.c
index fc53f43..f2c9f58 100644
--- a/pcap-dlpi.c
+++ b/pcap-dlpi.c
@@ -38,7 +38,7 @@
#ifndef lint
static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/libpcap/pcap-dlpi.c,v 1.69 2001-07-28 23:12:48 guy Exp $ (LBL)";
+ "@(#) $Header: /tcpdump/master/libpcap/pcap-dlpi.c,v 1.70 2001-07-29 01:22:40 guy Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
@@ -124,6 +124,17 @@ int
pcap_stats(pcap_t *p, struct pcap_stat *ps)
{
+ /*
+ * "ps_recv" counts packets handed to the filter, not packets
+ * that passed the filter.
+ *
+ * "ps_drop" counts packets dropped inside the DLPI service
+ * provider device device because of flow control requirements
+ * or resource exhaustion; it doesn't count packets dropped by
+ * the interface driver, or packets dropped upstream. As
+ * filtering is done in userland, it counts packets regardless
+ * of whether they would've passed the filter.
+ */
*ps = p->md.stat;
return (0);
}