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.TH PCAP_ACTIVATE 3 "5 April 2008"
.SH NAME
pcap_activate \- activate a capture handle
.SH SYNOPSIS
.nf
.ft B
#include <pcap/pcap.h>
.ft
.LP
.ft B
int pcap_activate(pcap_t *p);
.ft
.fi
.SH DESCRIPTION
.B pcap_activate()
is used to activate a packet capture handle to look
at packets on the network, with the options that were set on the handle
being in effect.
.SH RETURN VALUE
.B pcap_activate()
returns 0 on success without warnings,
.B PCAP_WARNING_PROMISC_NOTSUP
on success on a device that doesn't support promiscuous mode if
promiscuous mode was requested,
.B PCAP_WARNING_TSTAMP_TYPE_NOTSUP
on success if the time stamp type specified in a previous
.B pcap_set_tstamp_type()
call isn't supported by the capture source (the time stamp type is
left as the default),
.B PCAP_WARNING
on success with any other warning,
.B PCAP_ERROR_ACTIVATED
if the handle has already been activated,
.B PCAP_ERROR_NO_SUCH_DEVICE
if the capture source specified when the handle was created doesn't
exist,
.B PCAP_ERROR_PERM_DENIED
if the process doesn't have permission to open the capture source,
.B PCAP_ERROR_PROMISC_PERM_DENIED
if the process has permission to open the capture source but doesn't
have permission to put it into promiscuous mode,
.B PCAP_ERROR_RFMON_NOTSUP
if monitor mode was specified but the capture source doesn't support
monitor mode,
.B PCAP_ERROR_IFACE_NOT_UP
if the capture source is not up, and
.B PCAP_ERROR
if another error occurred.
If
.B PCAP_WARNING
or
.B PCAP_ERROR
is returned,
.B pcap_geterr()
or
.B pcap_perror()
may be called with
.I p
as an argument to fetch or display a message describing the warning or
error.
If
.BR PCAP_WARNING_PROMISC_NOTSUP ,
.BR PCAP_ERROR_NO_SUCH_DEVICE ,
or
.B PCAP_ERROR_PERM_DENIED
is returned,
.B pcap_geterr()
or
.B pcap_perror()
may be called with
.I p
as an argument to fetch or display an message giving additional details
about the problem that might be useful for debugging the problem if it's
unexpected.
.SH SEE ALSO
pcap(3)
