libpcap-98.40.1

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+.\" 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_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.
+