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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.
PCAP_LOOKUPDEV 3PCAP "8 September 2017"
NAME
pcap_lookupdev - find the default device on which to capture
SYNOPSIS
#include <pcap/pcap.h>
char errbuf[PCAP_ERRBUF_SIZE];[DEPRECATED] char *pcap_lookupdev(char *errbuf);
DESCRIPTIONThis interface is obsoleted by pcap_findalldevs (3PCAP). To find a default device on which to capture, call 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.)If pcap_init (3PCAP) has been called, this interface always returns NULL .
pcap_lookupdev () returns a pointer to a string giving the name of a network device suitable for use with pcap_create (3PCAP) and \%pcap_activate (3PCAP), or with pcap_open_live (3PCAP), and with pcap_lookupnet (3PCAP). If there is an error, or if pcap_init (3PCAP) has been called, NULL is returned and errbuf is filled in with an appropriate error message. errbuf is assumed to be able to hold at least PCAP_ERRBUF_SIZE chars.
SEE ALSOpcap (3PCAP)BUGSThe pointer returned by pcap_lookupdev () points to a static buffer; subsequent calls to pcap_lookupdev () in the same thread, or calls to pcap_lookupdev () in another thread, may overwrite that buffer.In WinPcap and Npcap, this function may return a UTF-16 string rather than an ASCII or UTF-8 string.