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pcap_stats - get capture statistics
int pcap_stats(pcap_t *p, struct pcap_stat *ps);
pcap_stats() fills in the struct pcap_stat pointed to by its second
argument. The values represent packet statistics from the start of the
run to the time of the call.
pcap_stats() is supported only on live captures, not on ``savefiles'';
no statistics are stored in ``savefiles'', so no statistics are avail-
able when reading from a ``savefile''.
A struct pcap_stat has the following members:
number of packets received;
number of packets dropped because there was no room in
the operating system's buffer when they arrived, because
packets weren't being read fast enough;
number of packets dropped by the network interface or its
The statistics do not behave the same way on all platforms. ps_recv
might count packets whether they passed any filter set with pcap_set-
filter(3) or not, or it might count only packets that pass the filter.
It also might, or might not, count packets dropped because there was no
room in the operating system's buffer when they arrived. ps_drop is
not available on all platforms; it is zero on platforms where it's not
available. If packet filtering is done in libpcap, rather than in the
operating system, it would count packets that don't pass the filter.
Both ps_recv and ps_drop might, or might not, count packets not yet
read from the operating system and thus not yet seen by the applica-
tion. ps_ifdrop might, or might not, be implemented; if it's zero,
that might mean that no packets were dropped by the interface, or it
might mean that the statistic is unavailable, so it should not be
treated as an indication that the interface did not drop any packets.
pcap_stats() returns 0 on success and returns -1 if there is an error
or if p doesn't support packet statistics. If -1 is returned,
pcap_geterr() or pcap_perror() may be called with p as an argument to
fetch or display the error text.
3 January 2014 PCAP_STATS(3)