1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
/*
ctdb lock helper
Copyright (C) Amitay Isaacs 2013
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "tdb.h"
#include "system/filesys.h"
#include "ctdb_private.h"
static char *progname = NULL;
static void send_result(int fd, char result)
{
write(fd, &result, 1);
if (result == 1) {
exit(1);
}
}
static void usage(void)
{
fprintf(stderr, "\n");
fprintf(stderr, "Usage: %s <ctdbd-pid> <output-fd> RECORD <db-path> <db-key>\n",
progname);
fprintf(stderr, " %s <ctdbd-pid> <output-fd> DB <db1-path> [<db2-path> ...]\n",
progname);
}
static int lock_record(const char *dbpath, const char *dbkey)
{
TDB_DATA key;
struct tdb_context *tdb;
/* Convert hex key to key */
if (strcmp(dbkey, "NULL") == 0) {
key.dptr = NULL;
key.dsize = 0;
} else {
key.dptr = hex_decode_talloc(NULL, dbkey, &key.dsize);
}
tdb = tdb_open(dbpath, 0, TDB_DEFAULT, O_RDWR, 0600);
if (tdb == NULL) {
fprintf(stderr, "%s: Error opening database %s\n", progname, dbpath);
return 1;
}
if (tdb_chainlock(tdb, key) < 0) {
fprintf(stderr, "%s: Error getting record lock (%s)\n",
progname, tdb_errorstr(tdb));
return 1;
}
return 0;
}
static int lock_db(const char *dbpath)
{
struct tdb_context *tdb;
tdb = tdb_open(dbpath, 0, TDB_DEFAULT, O_RDWR, 0600);
if (tdb == NULL) {
fprintf(stderr, "%s: Error opening database %s\n", progname, dbpath);
return 1;
}
if (tdb_lockall(tdb) < 0) {
fprintf(stderr, "%s: Error getting db lock (%s)\n",
progname, tdb_errorstr(tdb));
return 1;
}
return 0;
}
int main(int argc, char *argv[])
{
int write_fd;
char result = 0;
int ppid;
const char *lock_type;
progname = argv[0];
if (argc < 4) {
usage();
exit(1);
}
reset_scheduler();
ppid = atoi(argv[1]);
write_fd = atoi(argv[2]);
lock_type = argv[3];
if (strcmp(lock_type, "RECORD") == 0) {
if (argc != 6) {
fprintf(stderr, "%s: Invalid number of arguments (%d)\n",
progname, argc);
usage();
exit(1);
}
result = lock_record(argv[4], argv[5]);
} else if (strcmp(lock_type, "DB") == 0) {
int n;
/* If there are no databases specified, no need for lock */
if (argc > 4) {
for (n=4; n<argc; n++) {
result = lock_db(argv[n]);
if (result != 0) {
break;
}
}
}
} else {
fprintf(stderr, "%s: Invalid lock-type '%s'\n", progname, lock_type);
usage();
exit(1);
}
send_result(write_fd, result);
while (kill(ppid, 0) == 0 || errno != ESRCH) {
sleep(5);
}
return 0;
}
|
