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.\" @(#) $Header: /tcpdump/master/libpcap/pcap_activate.3pcap,v 1.5 2008-07-01 08:02:33 guy Exp $
.\"
.\" Copyright (c) 1994, 1996, 1997
.\" The Regents of the University of California. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that: (1) source code distributions
.\" retain the above copyright notice and this paragraph in its entirety, (2)
.\" distributions including binary code include the above copyright notice and
.\" this paragraph in its entirety in the documentation or other materials
.\" provided with the distribution, and (3) all advertising materials mentioning
.\" features or use of this software display the following acknowledgement:
.\" ``This product includes software developed by the University of California,
.\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
.\" the University nor the names of its contributors may be used to endorse
.\" or promote products derived from this software without specific prior
.\" written permission.
.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
.\"
.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 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
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_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(3PCAP)
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