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pcap_set_immediate_mode(3pcap)

PCAP_SET_IMMEDIATE_MODE(3pcap)                  PCAP_SET_IMMEDIATE_MODE(3pcap)

NAME
       pcap_set_immediate_mode  -  set  immediate mode for a not-yet-activated
       capture handle

SYNOPSIS
       #include <pcap/pcap.h>

       int pcap_set_immediate_mode(pcap_t *p, int immediate_mode);

DESCRIPTION
       pcap_set_immediate_mode() sets whether immediate mode should be set  on
       a  capture  handle  when  the  handle is activated.  In immediate mode,
       packets are always delivered as soon as they arrive, with no buffering.
       If immediate_mode is non-zero, immediate mode will be set, otherwise it
       will not be set.

RETURN VALUE
       pcap_set_immediate_mode() 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 1.5.0.  In previous
       releases, if immediate delivery of packets is required:

              on FreeBSD, NetBSD, OpenBSD, DragonFly BSD, macOS,  and  Solaris
              11,  immediate  mode  must  be  turned  on  with a BIOCIMMEDIATE
              ioctl(2), as documented in bpf(4), on the descriptor returned by
              pcap_fileno(3PCAP), after pcap_activate(3PCAP) is called;

              on Solaris 10 and earlier versions of  Solaris,  immediate  mode
              must  be turned on by using a read timeout of 0 when opening the
              device (this will not provide immediate delivery of  packets  on
              other platforms, so don't assume it's sufficient);

              on  Digital UNIX/Tru64 UNIX, immediate mode must be turned on by
              doing a BIOCMBIC ioctl(), as documented in  packetfilter(7),  to
              clear   the   ENBATCH   flag   on  the  descriptor  returned  by
              pcap_fileno(3PCAP), after pcap_activate(3PCAP) is called;

              on  Windows,  immediate  mode  must  be  turned  on  by  calling
              pcap_setmintocopy() with a size of 0.

       On Linux, with previous releases of libpcap, capture devices are always
       in  immediate  mode; however, in 1.5.0 and later, they are, by default,
       not in immediate mode, so if pcap_set_immediate_mode() is available, it
       should be used.

       On other platforms, capture devices are always in immediate mode.


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_create(3PCAP), pcap_activate(3PCAP)



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/libpcap-1.10.4.tar.gz

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

                                23 August 2018  PCAP_SET_IMMEDIATE_MODE(3pcap)
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