HWSTAMP_CTL(8) System Manager's Manual HWSTAMP_CTL(8)NAME
hwstamp_ctl - set time stamping policy at the driver level
SYNOPSIS
hwstamp_ctl -i interface [ -r rx-filter ] [ -t tx-type ] [ -v ]
DESCRIPTION
hwstamp_ctl is a program used to set the hardware time stamping policy at the network driver level with the SIOCSHWTSTAMP ioctl(2). The
tx-type and rx-filter values are hints to the driver what it is expected to do. If the requested fine-grained filtering for incoming pack-
ets is not supported, the driver may time stamp more than just the requested types of packets.
This program is a debugging tool. The ptp4l(8) program does not need this program to function, it will set the policy automatically as
appropriate.
OPTIONS -i interface
Specify the network interface of which the policy should be changed.
-r rx-filter
Specify which types of incoming packets should be time stamped, rx-filter is an integer value.
-t tx-type
Enable or disable hardware time stamping for outgoing packets, tx-type is an integer value.
-h Display a help message and list of possible values for rx-filter and tx-type.
-v Prints the software version and exits.
SEE ALSO ioctl(2), ptp4l(8)linuxptp November 2012 HWSTAMP_CTL(8)
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PCAP_STATS(3PCAP)PCAP_STATS(3PCAP)NAME
pcap_stats - get capture statistics
SYNOPSIS
#include <pcap/pcap.h>
int pcap_stats(pcap_t *p, struct pcap_stat *ps);
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_set-
filter(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.
RETURN VALUE
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.
SEE ALSO pcap(3PCAP), pcap_geterr(3PCAP)
7 September 2009 PCAP_STATS(3PCAP)