получить статистику захвата (get capture statistics)
Имя (Name)
pcap_stats - get capture statistics
Синопсис (Synopsis)
#include <pcap/pcap.h>
int pcap_stats(pcap_t *p, struct pcap_stat *ps);
Описание (Description)
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 available when reading from a ``savefile''.
A struct pcap_stat has the following members:
ps_recv
number of packets received;
ps_drop
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;
ps_ifdrop
number of packets dropped by the network interface
or its driver.
The statistics do not behave the same way on all platforms.
ps_recv might count packets whether they passed any filter set
with pcap_setfilter(3PCAP) 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
application. 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.
Возвращаемое значение (Return value)
pcap_stats() returns 0 on success and returns PCAP_ERROR if there
is an error or if p doesn't support packet statistics. If
PCAP_ERROR is returned, pcap_geterr(3PCAP) or pcap_perror(3PCAP)
may be called with p as an argument to fetch or display the error
text.
Смотри также (See also)
pcap(3PCAP)
