pcap_lookupdev(3PCAP) man page
Updated: 8 September 2017 •
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This man page documents libpcap version 1.10.0 (see also: git master branch, 1.10.4, 1.10.2, 1.10.1, 1.9.1, 1.8.1, 1.7.4, 1.6.2, 1.5.3).
Your system may have a different version installed, possibly with some local modifications. To achieve the best results, please make sure this version of this man page suits your needs. If necessary, try to look for a different version on this web site or in the man pages available in your installation.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);
DESCRIPTION
This 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 ALSO
pcap(3PCAP)
BUGS
The 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.
COLOPHON
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