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- .\" Copyright (c) 1994, 1996, 1997
- .\" The Regents of the University of California. All rights reserved.
- .\"
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- .\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
- .\" the University nor the names of its contributors may be used to endorse
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- .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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- .TH PCAP_LOOKUPDEV 3PCAP "8 September 2017"
- .SH NAME
- pcap_lookupdev \- find the default device on which to capture
- .SH SYNOPSIS
- .nf
- .ft B
- #include <pcap/pcap.h>
- .ft
- .LP
- .nf
- .ft B
- char errbuf[PCAP_ERRBUF_SIZE];
- .ft
- .LP
- .ft B
- [DEPRECATED] char *pcap_lookupdev(char *errbuf);
- .ft
- .fi
- .SH DESCRIPTION
- .B This interface is obsoleted by
- .BR pcap_findalldevs (3PCAP).
- To find a default device on which to capture, call
- .B 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.)
- .LP
- .B pcap_lookupdev()
- returns a pointer to a string giving the name of a network device
- suitable for use with
- .B pcap_create()
- and
- .BR pcap_activate() ,
- or with
- .BR pcap_open_live() ,
- and with
- .BR pcap_lookupnet() .
- If there is an error,
- .B NULL
- is returned and
- .I errbuf
- is filled in with an appropriate error message.
- .I errbuf
- is assumed to be able to hold at least
- .B PCAP_ERRBUF_SIZE
- chars.
- .SH SEE ALSO
- pcap(3PCAP), pcap_create(3PCAP), pcap_activate(3PCAP),
- pcap_open_live(3PCAP), pcap_lookupnet(3PCAP)
- .SH BUGS
- The pointer returned by
- .B pcap_lookupdev()
- points to a static buffer; subsequent calls to
- .B pcap_lookupdev()
- in the same thread, or calls to
- .B pcap_lookupdev()
- in another thread, may overwrite that buffer.
- .LP
- In WinPcap, this function may return a UTF-16 string rather than an
- ASCII or UTF-8 string.
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