pcap_set_datalink.3pcap

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.TH PCAP_SET_DATALINK 3PCAP "5 March 2022"
.SH NAME
pcap_set_datalink \- set the link-layer header type to be used by a
capture device
.SH SYNOPSIS
.nf
.ft B
#include <pcap/pcap.h>
.ft
.LP
.ft B
int pcap_set_datalink(pcap_t *p, int dlt);
.ft
.fi
.SH DESCRIPTION
.BR pcap_set_datalink ()
is used to set the current link-layer header type of the pcap descriptor
to the type specified by
.IR dlt .
.SH RETURN VALUE
.BR pcap_set_datalink ()
returns
.B 0
on success,
.B PCAP_ERROR_NOT_ACTIVATED
if called on a capture handle that has been created but not activated, or
.B PCAP_ERROR
on other errors. If
.B PCAP_ERROR
is returned,
.BR pcap_geterr (3PCAP)
or
.BR pcap_perror (3PCAP)
may be called with
.I p
as an argument to fetch or display the error text.
.SH SEE ALSO
.BR pcap (3PCAP),
.BR pcap_datalink (3PCAP),
.BR pcap_list_datalinks (3PCAP),
.BR pcap_datalink_name_to_val (3PCAP)