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pcap_datalink(3pcap)

PCAP_DATALINK(3pcap)                                      PCAP_DATALINK(3pcap)



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(3PCAP)    that    has    not    yet   been   activated   by
       pcap_activate(3PCAP).

       https://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 Ethernet.
       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
       created but not activated.


ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:


       box; cbp-1 | cbp-1 l | l .  ATTRIBUTE TYPE ATTRIBUTE VALUE = Availabil‐
       ity   system/library/libpcap = Stability Uncommitted


SEE ALSO
       pcap(3PCAP), pcap-linktype(7)



NOTES
       Source code for open source software components in Oracle  Solaris  can
       be found at https://www.oracle.com/downloads/opensource/solaris-source-
       code-downloads.html.

       This    software    was    built    from    source     available     at
       https://github.com/oracle/solaris-userland.    The  original  community
       source  was  downloaded   from    https://www.tcpdump.org/release/libp‐
       cap-1.9.1.tar.gz.

       Further information about this software can be found on the open source
       community website at https://www.tcpdump.org/.



                                 7 April 2014             PCAP_DATALINK(3pcap)
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