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bb406b71 MD |
1 | /* |
2 | * Copyright (c) 2005 The DragonFly Project. All rights reserved. | |
3 | * | |
4 | * This code is derived from software contributed to The DragonFly Project | |
5 | * by Matthew Dillon <dillon@backplane.com> | |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * | |
11 | * 1. Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in | |
15 | * the documentation and/or other materials provided with the | |
16 | * distribution. | |
17 | * 3. Neither the name of The DragonFly Project nor the names of its | |
18 | * contributors may be used to endorse or promote products derived | |
19 | * from this software without specific, prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
22 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
23 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | |
24 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | |
25 | * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, | |
26 | * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, | |
27 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
28 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED | |
29 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | |
30 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT | |
31 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
32 | * SUCH DAMAGE. | |
33 | * | |
36456e49 | 34 | * $DragonFly: src/sbin/jscan/jsession.c,v 1.3 2005/09/07 19:10:09 dillon Exp $ |
bb406b71 MD |
35 | */ |
36 | ||
37 | #include "jscan.h" | |
38 | ||
39 | void | |
40 | jsession_init(struct jsession *ss, struct jfile *jfin, | |
a9cb3889 MD |
41 | enum jdirection direction, |
42 | const char *transid_file, int64_t transid) | |
bb406b71 MD |
43 | { |
44 | bzero(ss, sizeof(*ss)); | |
45 | ss->ss_jfin = jfin; | |
a9cb3889 | 46 | ss->ss_direction = direction; |
bb406b71 MD |
47 | ss->ss_transid = transid; |
48 | ss->ss_transid_file = transid_file; | |
49 | ss->ss_transid_fd = -1; | |
50 | } | |
51 | ||
36456e49 MD |
52 | /* |
53 | * Update the last-processed transid. If operating in the reverse | |
54 | * direction we have to write out transid - 1 so the next reverse | |
55 | * processing operation does not re-execute the transid just executed | |
56 | * and so the next forward processing operation does. | |
57 | */ | |
bb406b71 MD |
58 | void |
59 | jsession_update_transid(struct jsession *ss __unused, int64_t transid) | |
60 | { | |
61 | char buf[32]; | |
62 | ||
63 | if (ss->ss_transid_file) { | |
64 | if (ss->ss_transid_fd < 0) { | |
65 | ss->ss_transid_fd = open(ss->ss_transid_file, O_RDWR|O_CREAT, 0666); | |
66 | } | |
67 | if (ss->ss_transid_fd < 0) { | |
68 | fprintf(stderr, "Cannot open/create %s\n", ss->ss_transid_file); | |
69 | exit(1); | |
70 | } | |
36456e49 | 71 | if (ss->ss_direction == JD_FORWARDS) |
a276dc6b | 72 | snprintf(buf, sizeof(buf), "%016jx\n", (uintmax_t)transid); |
36456e49 | 73 | else |
a276dc6b | 74 | snprintf(buf, sizeof(buf), "%016jx\n", (uintmax_t)(transid - 1)); |
bb406b71 MD |
75 | lseek(ss->ss_transid_fd, 0L, 0); |
76 | write(ss->ss_transid_fd, buf, strlen(buf)); | |
77 | if (fsync_opt > 1) | |
78 | fsync(ss->ss_transid_fd); | |
79 | } | |
80 | } | |
81 | ||
36456e49 MD |
82 | /* |
83 | * Returns non-zero if the data can be dumped into the specified session. | |
84 | */ | |
85 | int | |
86 | jsession_check(struct jsession *ss, struct jdata *jd) | |
87 | { | |
88 | if (ss->ss_direction == JD_FORWARDS) { | |
89 | if (jd->jd_transid > ss->ss_transid) | |
90 | return(1); | |
91 | } else { | |
92 | if (jd->jd_transid <= ss->ss_transid) | |
93 | return(1); | |
94 | } | |
95 | return(0); | |
96 | } | |
97 | ||
bb406b71 MD |
98 | void |
99 | jsession_term(struct jsession *ss) | |
100 | { | |
101 | if (ss->ss_transid_fd >= 0) { | |
102 | close(ss->ss_transid_fd); | |
103 | ss->ss_transid_fd = -1; | |
104 | } | |
105 | } | |
106 |