PCAP_LOOKUPDEV - Online Linux Manual PageSection : 3PCAP
Updated : 8 September 2017

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NAMEpcap_lookupdev − find the default device on which to capture

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SYNOPSIS#include <pcap/pcap.h> char errbuf[PCAP_ERRBUF_SIZE]; [DEPRECATED] char *pcap_lookupdev(char *errbuf);

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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.

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SEE ALSOpcap(3PCAP)

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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. 0

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