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https://github.com/samba-team/samba.git
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30aa825c1e
Signed-off-by: Amitay Isaacs <amitay@gmail.com> (This used to be ctdb commit a08b6ac19506160f3fb5925ea025027dce07781d)
149 lines
3.0 KiB
C
149 lines
3.0 KiB
C
/*
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ctdb lock helper
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Copyright (C) Amitay Isaacs 2013
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "tdb.h"
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#include "system/filesys.h"
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#include "../include/ctdb_private.h"
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static char *progname = NULL;
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static void send_result(int fd, char result)
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{
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write(fd, &result, 1);
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if (result == 1) {
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exit(1);
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}
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}
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static void usage(void)
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{
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fprintf(stderr, "\n");
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fprintf(stderr, "Usage: %s <ctdbd-pid> <output-fd> RECORD <db-path> <db-key>\n",
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progname);
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fprintf(stderr, " %s <ctdbd-pid> <output-fd> DB <db1-path> [<db2-path> ...]\n",
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progname);
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}
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static int lock_record(const char *dbpath, const char *dbkey)
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{
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TDB_DATA key;
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struct tdb_context *tdb;
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/* Convert hex key to key */
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if (strcmp(dbkey, "NULL") == 0) {
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key.dptr = NULL;
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key.dsize = 0;
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} else {
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key.dptr = hex_decode_talloc(NULL, dbkey, &key.dsize);
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}
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tdb = tdb_open(dbpath, 0, TDB_DEFAULT, O_RDWR, 0600);
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if (tdb == NULL) {
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fprintf(stderr, "%s: Error opening database %s\n", progname, dbpath);
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return 1;
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}
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if (tdb_chainlock(tdb, key) < 0) {
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fprintf(stderr, "%s: Error getting record lock (%s)\n",
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progname, tdb_errorstr(tdb));
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return 1;
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}
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return 0;
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}
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static int lock_db(const char *dbpath)
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{
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struct tdb_context *tdb;
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tdb = tdb_open(dbpath, 0, TDB_DEFAULT, O_RDWR, 0600);
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if (tdb == NULL) {
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fprintf(stderr, "%s: Error opening database %s\n", progname, dbpath);
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return 1;
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}
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if (tdb_lockall(tdb) < 0) {
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fprintf(stderr, "%s: Error getting db lock (%s)\n",
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progname, tdb_errorstr(tdb));
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return 1;
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}
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return 0;
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}
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int main(int argc, char *argv[])
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{
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int write_fd;
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char result = 0;
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int ppid;
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const char *lock_type;
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progname = argv[0];
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if (argc < 4) {
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usage();
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exit(1);
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}
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ppid = atoi(argv[1]);
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write_fd = atoi(argv[2]);
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lock_type = argv[3];
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if (strcmp(lock_type, "RECORD") == 0) {
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if (argc != 6) {
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fprintf(stderr, "%s: Invalid number of arguments (%d)\n",
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progname, argc);
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usage();
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exit(1);
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}
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result = lock_record(argv[4], argv[5]);
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} else if (strcmp(lock_type, "DB") == 0) {
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int n;
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/* If there are no databases specified, no need for lock */
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if (argc > 4) {
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for (n=4; n<argc; n++) {
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result = lock_db(argv[n]);
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if (result != 0) {
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break;
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}
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}
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}
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} else {
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fprintf(stderr, "%s: Invalid lock-type '%s'\n", progname, lock_type);
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usage();
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exit(1);
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}
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send_result(write_fd, result);
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while (kill(ppid, 0) == 0 || errno != ESRCH) {
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sleep(5);
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}
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return 0;
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}
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