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1 office 1 .\" Copyright (c) 1994, 1996, 1997
2 .\" The Regents of the University of California. All rights reserved.
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5 .\" modification, are permitted provided that: (1) source code distributions
6 .\" retain the above copyright notice and this paragraph in its entirety, (2)
7 .\" distributions including binary code include the above copyright notice and
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10 .\" features or use of this software display the following acknowledgement:
11 .\" ``This product includes software developed by the University of California,
12 .\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
13 .\" the University nor the names of its contributors may be used to endorse
14 .\" or promote products derived from this software without specific prior
15 .\" written permission.
16 .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
17 .\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
18 .\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
19 .\"
20 .TH PCAP_OPEN_DEAD 3PCAP "1 July 2013"
21 .SH NAME
22 pcap_open_dead, pcap_open_dead_with_tstamp_precision \- open a fake
23 pcap_t for compiling filters or opening a capture for output
24 .SH SYNOPSIS
25 .nf
26 .ft B
27 #include <pcap/pcap.h>
28 .ft
29 .LP
30 .ft B
31 pcap_t *pcap_open_dead(int linktype, int snaplen);
32 pcap_t *pcap_open_dead_with_tstamp_precision(int linktype, int snaplen,
33 u_int precision);
34 .ft
35 .fi
36 .SH DESCRIPTION
37 .PP
38 .B pcap_open_dead()
39 and
40 .B pcap_open_dead_with_tstamp_precision()
41 are used for creating a
42 .B pcap_t
43 structure to use when calling the other functions in libpcap. It is
44 typically used when just using libpcap for compiling BPF code; it can
45 also be used if using
46 .BR pcap_dump_open() ,
47 .BR pcap_dump() ,
48 and
49 .B pcap_dump_close()
50 to write a savefile if there is no
51 .B pcap_t
52 that supplies the packets to be written.
53 .PP
54 .I linktype
55 specifies the link-layer type for the
56 .BR pcap_t .
57 .PP
58 .I snaplen
59 specifies the snapshot length for the
60 .BR pcap_t .
61 .PP
62 When
63 .BR pcap_open_dead_with_tstamp_precision() ,
64 is used to create a
65 .B pcap_t
66 for use with
67 .BR pcap_dump_open() ,
68 .I precision
69 specifies the time stamp precision for packets;
70 .B PCAP_TSTAMP_PRECISION_MICRO
71 should be specified if the packets to be written have time stamps in
72 seconds and microseconds, and
73 .B PCAP_TSTAMP_PRECISION_NANO
74 should be specified if the packets to be written have time stamps in
75 seconds and nanoseconds. Its value does not affect
76 .BR pcap_compile() .
77 .SH SEE ALSO
78 pcap(3PCAP), pcap_compile(3PCAP), pcap_dump_open(3PCAP),
79 pcap-linktype(@MAN_MISC_INFO@)