1PCAP_LOOKUPDEV(3PCAP)                                    PCAP_LOOKUPDEV(3PCAP)
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NAME

6       pcap_lookupdev - find the default device on which to capture
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SYNOPSIS

9       #include <pcap/pcap.h>
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11       char errbuf[PCAP_ERRBUF_SIZE];
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13       [DEPRECATED] char *pcap_lookupdev(char *errbuf);
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DESCRIPTION

16       This  interface  is  obsoleted  by  pcap_findalldevs(3PCAP).  To find a
17       default device on which to capture, call pcap_findalldevs() and, if the
18       list  it  returns  is not empty, use the first device in the list.  (If
19       the list is empty, there are no devices on which capture is possible.)
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21       If pcap_init(3PCAP) has been  called,  this  interface  always  returns
22       NULL.
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24       pcap_lookupdev()  returns  a  pointer  to a string giving the name of a
25       network  device  suitable   for   use   with   pcap_create(3PCAP)   and
26       pcap_activate(3PCAP),   or   with   pcap_open_live(3PCAP),   and   with
27       pcap_lookupnet(3PCAP).  If there is an error,  or  if  pcap_init(3PCAP)
28       has  been  called,  NULL  is  returned  and errbuf is filled in with an
29       appropriate error message.  errbuf is assumed to be  able  to  hold  at
30       least PCAP_ERRBUF_SIZE chars.
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SEE ALSO

33       pcap(3PCAP)
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BUGS

36       The  pointer  returned  by  pcap_lookupdev() points to a static buffer;
37       subsequent calls to pcap_lookupdev() in the same thread,  or  calls  to
38       pcap_lookupdev() in another thread, may overwrite that buffer.
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40       In  WinPcap  and Npcap, this function may return a UTF-16 string rather
41       than an ASCII or UTF-8 string.
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45                               8 September 2017          PCAP_LOOKUPDEV(3PCAP)
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