PCAP_LOOKUPDEV(3PCAP) PCAP_LOOKUPDEV(3PCAP)
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 de-
fault 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 ap-
propriate 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.
8 September 2017 PCAP_LOOKUPDEV(3PCAP)
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