pcap_snapshot(3) [freebsd man page]

PCAP_SNAPSHOT(3)					     Library Functions Manual						  PCAP_SNAPSHOT(3)

NAME

       pcap_snapshot - get the snapshot length

SYNOPSIS

       #include <pcap/pcap.h>

       int pcap_snapshot(pcap_t *p);

DESCRIPTION

       pcap_snapshot()	returns  the snapshot length specified when pcap_set_snapshot() or pcap_open_live() was called, for a live capture, or the
       snapshot length from the capture file, for a ``savefile''.

       It must not be called on a pcap descriptor created by pcap_create() that has not yet been activated by pcap_activate().

RETURN VALUE

       pcap_snapshot() returns the snapshot length on success and PCAP_ERROR_NOT_ACTIVATED if called on a capture handle that has been created but
       not activated.

SEE ALSO

       pcap(3)

								 17 September 2013						  PCAP_SNAPSHOT(3)

PCAP_DATALINK(3)					     Library Functions Manual						  PCAP_DATALINK(3)

NAME

       pcap_datalink - get the link-layer header type

SYNOPSIS

       #include <pcap/pcap.h>

       int pcap_datalink(pcap_t *p);

DESCRIPTION

       pcap_datalink() returns the link-layer header type for the live capture or ``savefile'' specified by p.

       It must not be called on a pcap descriptor created by pcap_create() that has not yet been activated by pcap_activate().

       http://www.tcpdump.org/linktypes.html lists the values pcap_datalink() can return and describes the packet formats that correspond to those
       values.

       Do NOT assume that the packets for a given capture or ``savefile`` will have any given link-layer header type, such as DLT_EN10MB for  Eth-
       ernet.  For example, the "any" device on Linux will have a link-layer header type of DLT_LINUX_SLL even if all devices on the system at the
       time the "any" device is opened have some other data link type, such as DLT_EN10MB for Ethernet.

RETURN VALUE

       pcap_datalink() returns the link-layer header type on success and PCAP_ERROR_NOT_ACTIVATED if called on a capture handle that has been cre-
       ated but not activated.

SEE ALSO

       pcap(3), pcap-linktype(7)

								  13 October 2013						  PCAP_DATALINK(3)