.\" 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_OPEN_LIVE 3PCAP "6 December 2017"
.SH NAME
pcap_open_live \- open a device for capturing
.SH SYNOPSIS
.nf
.ft B
#include <pcap/pcap.h>
.ft
.LP
.nf
.ft B
char errbuf[PCAP_ERRBUF_SIZE];
.ft
.LP
.ft B
pcap_t *pcap_open_live(const char *device, int snaplen,
.ti +8
int promisc, int to_ms, char *errbuf);
.ft
.fi
.SH DESCRIPTION
.BR pcap_open_live ()
is used to obtain a packet capture handle to look
at packets on the network.
.I device
is a string that specifies the network device to open; on Linux systems
with 2.2 or later kernels, a
.I device
argument of "any" or
.B NULL
can be used to capture packets from all interfaces.
.PP
.I snaplen
specifies the snapshot length to be set on the handle.
.PP
.I promisc
specifies whether the interface is to be put into promiscuous mode.
If
.I promisc
is non-zero, promiscuous mode will be set, otherwise it will not be set.
.PP
.I to_ms
specifies the packet buffer timeout, as a non-negative value, in
milliseconds.  (See
.BR pcap (3PCAP)
for an explanation of the packet buffer timeout.)
.SH RETURN VALUE
.BR pcap_open_live ()
returns a
.I pcap_t *
on success and
.B NULL
on failure.
If
.B NULL
is returned,
.I errbuf
is filled in with an appropriate error message.
.I errbuf
may also be set to warning text when
.BR pcap_open_live ()
succeeds; to detect this case the caller should store a zero-length string in
.I errbuf
before calling
.BR pcap_open_live ()
and display the warning to the user if
.I errbuf
is no longer a zero-length string.
.I errbuf
is assumed to be able to hold at least
.B PCAP_ERRBUF_SIZE
chars.
.SH SEE ALSO
.BR pcap_create (3PCAP),
.BR pcap_activate (3PCAP)