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/*
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 "../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);
}
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;
}
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