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100 lines
3.3 KiB
100 lines
3.3 KiB
4 months ago
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.\"
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.\" Copyright (c) 1994, 1996, 1997
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that: (1) source code distributions
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.\" retain the above copyright notice and this paragraph in its entirety, (2)
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.\" distributions including binary code include the above copyright notice and
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.\" this paragraph in its entirety in the documentation or other materials
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.\" provided with the distribution, and (3) all advertising materials mentioning
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.\" features or use of this software display the following acknowledgement:
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.\" ``This product includes software developed by the University of California,
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.\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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.\" the University nor the names of its contributors may be used to endorse
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.\" or promote products derived from this software without specific prior
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.\" written permission.
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.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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.\"
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.TH PCAP_SET_IMMEDIATE_MODE 3PCAP "23 August 2018"
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.SH NAME
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pcap_set_immediate_mode \- set immediate mode for a not-yet-activated capture
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handle
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.SH SYNOPSIS
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.nf
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.ft B
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#include <pcap/pcap.h>
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.LP
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.ft B
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int pcap_set_immediate_mode(pcap_t *p, int immediate_mode);
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.ft
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.fi
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.SH DESCRIPTION
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.BR pcap_set_immediate_mode ()
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sets whether immediate mode should be set on a capture handle when
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the handle is activated. In immediate mode, packets are always
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delivered as soon as they arrive, with no buffering.
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If
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.I immediate_mode
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is non-zero, immediate mode will be set, otherwise it will not be set.
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.SH RETURN VALUE
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.BR pcap_set_immediate_mode ()
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returns
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.B 0
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on success or
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.B PCAP_ERROR_ACTIVATED
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if called on a capture handle that has been activated.
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.SH BACKWARD COMPATIBILITY
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.PP
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This function became available in libpcap release 1.5.0. In previous
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releases, if immediate delivery of packets is required:
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.IP
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on FreeBSD, NetBSD, OpenBSD, DragonFly BSD, macOS, and Solaris 11,
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immediate mode must be turned on with a
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.B BIOCIMMEDIATE
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.BR ioctl (2),
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as documented in
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.BR bpf (@MAN_DEVICES@),
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on the descriptor returned by
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.BR pcap_fileno (3PCAP),
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after
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.BR pcap_activate (3PCAP)
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is called;
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.IP
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on Solaris 10 and earlier versions of Solaris, immediate mode must be
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turned on by using a read timeout of 0 when opening the device (this
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will not provide immediate delivery of packets on other platforms, so
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don't assume it's sufficient);
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.IP
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on Digital UNIX/Tru64 UNIX, immediate mode must be turned on by doing a
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.B BIOCMBIC
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.BR ioctl ,
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as documented in
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.BR packetfilter (7),
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to clear the
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.B ENBATCH
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flag on the descriptor returned by
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.BR pcap_fileno (3PCAP),
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after
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.BR pcap_activate (3PCAP)
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is called;
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.IP
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on Windows, immediate mode must be turned on by calling
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.BR pcap_setmintocopy ()
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with a size of 0.
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.PP
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On Linux, with previous releases of libpcap, capture devices are always
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in immediate mode; however, in 1.5.0 and later, they are, by default,
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.B not
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in immediate mode, so if
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.BR pcap_set_immediate_mode ()
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is available, it should be used.
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.PP
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On other platforms, capture devices are always in immediate mode.
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.SH SEE ALSO
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.BR pcap (3PCAP),
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.BR pcap_create (3PCAP),
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.BR pcap_activate (3PCAP)
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