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86 lines
2.9 KiB
86 lines
2.9 KiB
4 months ago
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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_OPEN_DEAD 3PCAP "3 January 2014"
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.SH NAME
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pcap_open_dead, pcap_open_dead_with_tstamp_precision \- open a fake
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pcap_t for compiling filters or opening a capture for output
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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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.ft
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.LP
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.ft B
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pcap_t *pcap_open_dead(int linktype, int snaplen);
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pcap_t *pcap_open_dead_with_tstamp_precision(int linktype, int snaplen,
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u_int precision);
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.ft
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.fi
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.SH DESCRIPTION
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.PP
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.BR pcap_open_dead ()
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and
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.BR pcap_open_dead_with_tstamp_precision ()
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are used for creating a
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.B pcap_t
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structure to use when calling the other functions in libpcap. It is
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typically used when just using libpcap for compiling BPF code; it can
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also be used if using
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.BR pcap_dump_open (3PCAP),
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.BR pcap_dump (3PCAP),
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and
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.BR pcap_dump_close (3PCAP)
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to write a savefile if there is no
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.B pcap_t
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that supplies the packets to be written.
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.PP
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.I linktype
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specifies the link-layer type for the
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.BR pcap_t .
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.PP
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.I snaplen
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specifies the snapshot length for the
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.BR pcap_t .
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.PP
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When
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.BR pcap_open_dead_with_tstamp_precision (),
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is used to create a
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.B pcap_t
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for use with
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.BR pcap_dump_open (),
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.I precision
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specifies the time stamp precision for packets;
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.B PCAP_TSTAMP_PRECISION_MICRO
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should be specified if the packets to be written have time stamps in
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seconds and microseconds, and
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.B PCAP_TSTAMP_PRECISION_NANO
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should be specified if the packets to be written have time stamps in
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seconds and nanoseconds. Its value does not affect
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.BR pcap_compile (3PCAP).
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.SH BACKWARD COMPATIBILITY
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The
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.BR pcap_open_dead_with_tstamp_precision ()
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function became available in libpcap release 1.5.1. In previous
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releases, there was no mechanism to open a savefile for writing with
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time stamps given in seconds and nanoseconds.
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.SH SEE ALSO
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.BR pcap (3PCAP),
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.BR \%pcap-linktype (@MAN_MISC_INFO@)
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