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1 office 1 .\" Copyright (c) 1994, 1996, 1997
2 .\" The Regents of the University of California. All rights reserved.
3 .\"
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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_DUMP_OPEN 3PCAP "5 April 2008"
21 .SH NAME
22 pcap_dump_open, pcap_dump_fopen \- open a file to which to write packets
23 .SH SYNOPSIS
24 .nf
25 .ft B
26 #include <pcap/pcap.h>
27 .ft
28 .nf
29 .LP
30 .ft B
31 pcap_dumper_t *pcap_dump_open(pcap_t *p, const char *fname);
32 pcap_dumper_t *pcap_dump_open_append(pcap_t *p, const char *fname);
33 pcap_dumper_t *pcap_dump_fopen(pcap_t *p, FILE *fp);
34 .ft
35 .fi
36 .SH DESCRIPTION
37 .B pcap_dump_open()
38 is called to open a ``savefile'' for writing.
39 .I fname
40 specifies the name of the file to open. The file will have
41 the same format as those used by
42 .BR tcpdump (1)
43 and
44 .BR tcpslice (1).
45 The name "-" is a synonym
46 for
47 .BR stdout .
48 .PP
49 .B pcap_dump_fopen()
50 is called to write data to an existing open stream
51 .IR fp .
52 Note that on Windows, that stream should be opened in binary mode.
53 .PP
54 .I p
55 is a capture or ``savefile'' handle returned by an earlier call to
56 .B pcap_create()
57 and activated by an earlier call to
58 .BR pcap_activate() ,
59 or returned by an earlier call to
60 .BR pcap_open_offline() ,
61 .BR pcap_open_live() ,
62 or
63 .BR pcap_open_dead() .
64 The time stamp precision, link-layer type, and snapshot length from
65 .I p
66 are used as the link-layer type and snapshot length of the output file.
67 .PP
68 .B pcap_dump_open_append()
69 is like
70 .B pcap_dump_open
71 but does not create the file if it does not exist and, if it does
72 already exist, and is a pcap file with the same byte order as the host
73 opening the file, and has the same time stamp precision, link-layer
74 header type, and snapshot length as
75 .IR p ,
76 it will write new packets at the end of the file.
77 .SH RETURN VALUES
78 A pointer to a
79 .B pcap_dumper_t
80 structure to use in subsequent
81 .B pcap_dump()
82 and
83 .B pcap_dump_close()
84 calls is returned on success.
85 .B NULL
86 is returned on failure.
87 If
88 .B NULL
89 is returned,
90 .B pcap_geterr(\fIp\fB)
91 can be used to get the error text.
92 .SH SEE ALSO
93 pcap(3PCAP), pcap_create(3PCAP), pcap_activate(3PCAP),
94 pcap_open_offline(3PCAP), pcap_open_live(3PCAP), pcap_open_dead(3PCAP),
95 pcap_dump(3PCAP), pcap_dump_close(3PCAP), pcap_geterr(3PCAP),
96 pcap-savefile(@MAN_FILE_FORMATS@)