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.TH PCAP_ACTIVATE 3PCAP "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,
.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_RFMON_NOTSUP
if monitor mode was specified but the capture source doesn't support
monitor mode, and
.B PCAP_ERROR
if an error occurred.
If
.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 the error text.
.SH SEE ALSO
pcap(3PCAP)