PCAP_SET_PROTOCOL_LINUX(3PCAP)                  PCAP_SET_PROTOCOL_LINUX(3PCAP)

NAME
       pcap_set_protocol_linux - set capture protocol for a not-yet-activated
       capture handle

SYNOPSIS
       #include <pcap/pcap.h>

       int pcap_set_protocol_linux(pcap_t *p, int protocol);

DESCRIPTION
       On network interface devices on Linux, pcap_set_protocol_linux() sets
       the protocol to be used in the 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 <linux/if_ether.h> header
       file, specified in host byte order.  If 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.

       It should not be used in portable code; instead, a filter should be
       specified with pcap_setfilter(3PCAP).

       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 pcap_setfilter() but can be filtered by specifying the socket-
       layer protocol type using pcap_set_protocol_linux().

RETURN VALUE
       pcap_set_protocol_linux() returns 0 on success or PCAP_ERROR_ACTIVATED
       if called on a capture handle that has been activated.

BACKWARD COMPATIBILITY
       This function became available in libpcap release 1.9.0.

SEE ALSO
       pcap(3PCAP), pcap_create(3PCAP), pcap_activate(3PCAP)

                                22 August 2018  PCAP_SET_PROTOCOL_LINUX(3PCAP)