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+.\" Copyright (c) 1994, 1996, 1997
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that: (1) source code distributions
+.\" retain the above copyright notice and this paragraph in its entirety, (2)
+.\" distributions including binary code include the above copyright notice and
+.\" this paragraph in its entirety in the documentation or other materials
+.\" provided with the distribution, and (3) all advertising materials mentioning
+.\" features or use of this software display the following acknowledgement:
+.\" ``This product includes software developed by the University of California,
+.\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
+.\" the University nor the names of its contributors may be used to endorse
+.\" or promote products derived from this software without specific prior
+.\" written permission.
+.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+.\"
+.TH PCAP_SET_PROTOCOL_LINUX 3PCAP "24 August 2017"
+.SH NAME
+pcap_set_protocol_linux \- set capture protocol for a not-yet-activated
+capture handle
+.SH SYNOPSIS
+.nf
+.ft B
+#include <pcap/pcap.h>
+.LP
+.ft B
+int pcap_set_protocol_linux(pcap_t *p, int protocol);
+.ft
+.fi
+.SH DESCRIPTION
+On network interface devices on Linux,
+.B pcap_set_protocol_linux()
+sets the protocol to be used in the
+.BR socket (2)
+call to create a capture socket when the handle is activated.  The
+argument is a link-layer protocol value, such as the values in the
+.B <linux/if_ether.h>
+header file, specified in host byte order.
+If
+.I protocol
+is non-zero, packets of that protocol will be captured when the
+handle is activated, otherwise, all packets will be captured.  This
+function is only provided on Linux, and, if it is used on any device
+other than a network interface, it will have no effect.
+.LP
+It should not be used in portable code; instead, a filter should be
+specified with
+.BR pcap_setfilter(3PCAP) .
+.LP
+If a given network interface provides a standard link-layer header, with
+a standard packet type, but provides some packet types with a different
+socket-layer protocol type from the one in the link-layer header, that
+packet type cannot be filtered with a filter specified with
+.B pcap_setfilter()
+but can be filtered by specifying the socket-layer protocol type using
+.BR pcap_set_protocol_linux() .
+.SH RETURN VALUE
+.B pcap_set_protocol_linux()
+returns 0 on success or
+.B PCAP_ERROR_ACTIVATED
+if called on a capture handle that has been activated.
+.SH BACKWARD COMPATIBILITY
+This function became available in libpcap release 1.9.0.
+.SH SEE ALSO
+pcap(3PCAP), pcap_create(3PCAP), pcap_activate(3PCAP)