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TH PCAP_LOOKUPDEV 3PCAP "30 November 2023"
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
BR 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.)
I errbuf
is a buffer large enough to hold at least
B PCAP_ERRBUF_SIZE
chars.
LP
B If
BR pcap_init (3PCAP)
B has been called, this interface always returns
BR NULL .
LP
BR pcap_lookupdev ()
returns a pointer to a string giving the name of a network device
suitable for use with
BR pcap_create (3PCAP)
and
BR \%pcap_activate (3PCAP),
or with
BR pcap_open_live (3PCAP),
and with
BR pcap_lookupnet (3PCAP).
If there is an error,
or if
BR pcap_init (3PCAP)
has been called,
B NULL
is returned and
I errbuf
is filled in with an appropriate error message.
SH SEE ALSO
BR pcap (3PCAP)
SH BUGS
The pointer returned by
BR pcap_lookupdev ()
points to a static buffer; subsequent calls to
BR pcap_lookupdev ()
in the same thread, or calls to
BR pcap_lookupdev ()
in another thread, may overwrite that buffer.
LP
In WinPcap and Npcap, this function may return a UTF-16 string rather
than an ASCII or UTF-8 string.
