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.TH PCAP_LOOKUPDEV 3PCAP "8 September 2017"

.SH NAME

pcap_lookupdev \- find the default device on which to capture

.SH SYNOPSIS

.nf

.ft B

#include <pcap/pcap.h>

.ft

.LP

.nf

.ft B

char errbuf[PCAP_ERRBUF_SIZE];

.ft

.LP

.ft B

[DEPRECATED] char *pcap_lookupdev(char *errbuf);

.ft

.fi

.SH DESCRIPTION

.B This interface is obsoleted by

.BR pcap_findalldevs (3PCAP).

To find a default device on which to capture, call

.B pcap_findalldevs()

and, if the list it returns is not empty, use the first device in the

list.  (If the list is empty, there are no devices on which capture is

possible.)

.LP

.B pcap_lookupdev()

returns a pointer to a string giving the name of a network device

suitable for use with

.B pcap_create(3PCAP)

and

.BR \%pcap_activate(3PCAP) ,

or with

.BR pcap_open_live(3PCAP) ,

and with

.BR pcap_lookupnet(3PCAP) .

If there is an error,

.B NULL

is returned and

.I errbuf

is filled in with an appropriate error message.

.I errbuf

is assumed to be able to hold at least

.B PCAP_ERRBUF_SIZE

chars.

.SH SEE ALSO

pcap(3PCAP)

.SH BUGS

The pointer returned by

.B pcap_lookupdev()

points to a static buffer; subsequent calls to

.B pcap_lookupdev()

in the same thread, or calls to

.B pcap_lookupdev()

in another thread, may overwrite that buffer.

.LP

In WinPcap, this function may return a UTF-16 string rather than an

ASCII or UTF-8 string.