87 lines
2.6 KiB
Plaintext
87 lines
2.6 KiB
Plaintext
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.\" Copyright (c) 1994, 1996, 1997
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that: (1) source code distributions
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.\" retain the above copyright notice and this paragraph in its entirety, (2)
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.\" distributions including binary code include the above copyright notice and
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.\" this paragraph in its entirety in the documentation or other materials
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.\" provided with the distribution, and (3) all advertising materials mentioning
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.\" features or use of this software display the following acknowledgement:
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.\" ``This product includes software developed by the University of California,
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.\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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.\" the University nor the names of its contributors may be used to endorse
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.\" or promote products derived from this software without specific prior
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.\" written permission.
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.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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.\"
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.TH PCAP_LOOKUPDEV 3PCAP "8 September 2017"
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.SH NAME
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pcap_lookupdev \- find the default device on which to capture
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.SH SYNOPSIS
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.nf
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.ft B
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#include <pcap/pcap.h>
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.ft
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.LP
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.nf
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.ft B
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char errbuf[PCAP_ERRBUF_SIZE];
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.ft
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.LP
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.ft B
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[DEPRECATED] char *pcap_lookupdev(char *errbuf);
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.ft
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.fi
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.SH DESCRIPTION
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.B This interface is obsoleted by
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.BR pcap_findalldevs (3PCAP).
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To find a default device on which to capture, call
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.BR pcap_findalldevs ()
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and, if the list it returns is not empty, use the first device in the
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list. (If the list is empty, there are no devices on which capture is
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possible.)
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.LP
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.B If
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.BR pcap_init (3PCAP)
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.B has been called, this interface always returns
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.BR NULL .
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.LP
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.BR pcap_lookupdev ()
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returns a pointer to a string giving the name of a network device
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suitable for use with
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.BR pcap_create (3PCAP)
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and
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.BR \%pcap_activate (3PCAP),
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or with
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.BR pcap_open_live (3PCAP),
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and with
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.BR pcap_lookupnet (3PCAP).
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If there is an error,
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or if
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.BR pcap_init (3PCAP)
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has been called,
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.B NULL
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is returned and
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.I errbuf
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is filled in with an appropriate error message.
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.I errbuf
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is assumed to be able to hold at least
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.B PCAP_ERRBUF_SIZE
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chars.
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.SH SEE ALSO
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.BR pcap (3PCAP)
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.SH BUGS
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The pointer returned by
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.BR pcap_lookupdev ()
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points to a static buffer; subsequent calls to
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.BR pcap_lookupdev ()
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in the same thread, or calls to
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.BR pcap_lookupdev ()
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in another thread, may overwrite that buffer.
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.LP
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In WinPcap and Npcap, this function may return a UTF-16 string rather
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than an ASCII or UTF-8 string.
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