--- /dev/null
+/*
+ CTDB mutex fcntl lock file helper
+
+ Copyright (C) Martin Schwenke 2015
+
+ 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 "replace.h"
+#include "system/filesys.h"
+#include "system/network.h"
+
+/* protocol.h is just needed for ctdb_sock_addr, which is used in system.h */
+#include "protocol/protocol.h"
+#include "common/system.h"
+
+static char *progname = NULL;
+
+static char fcntl_lock(const char *file)
+{
+ int fd;
+ struct flock lock;
+
+ fd = open(file, O_RDWR|O_CREAT, 0600);
+ if (fd == -1) {
+ fprintf(stderr, "%s: Unable to open %s - (%s)\n",
+ progname, file, strerror(errno));
+ return '3';
+ }
+
+ lock.l_type = F_WRLCK;
+ lock.l_whence = SEEK_SET;
+ lock.l_start = 0;
+ lock.l_len = 1;
+ lock.l_pid = 0;
+
+ if (fcntl(fd, F_SETLK, &lock) != 0) {
+ int saved_errno = errno;
+ close(fd);
+ fd = -1;
+ if (saved_errno == EACCES ||
+ saved_errno == EAGAIN) {
+ /* Lock contention, fail silently */
+ return '1';
+ }
+
+ /* Log an error for any other failure */
+ fprintf(stderr,
+ "%s: Failed to get lock on '%s' - (%s)\n",
+ progname, file, strerror(saved_errno));
+ return '3';
+ }
+
+ return '0';
+}
+
+int main(int argc, char *argv[])
+{
+ char result;
+ int ppid;
+ const char *file = NULL;
+
+ progname = argv[0];
+
+ if (argc != 2) {
+ fprintf(stderr, "Usage: %s <file>\n", progname);
+ exit(1);
+ }
+
+ ppid = getppid();
+ file = argv[1];
+
+ result = fcntl_lock(file);
+ sys_write(STDOUT_FILENO, &result, 1);
+
+ ctdb_wait_for_process_to_exit(ppid);
+
+ return 0;
+}
samba-util replace tdb''',
install_path='${CTDB_HELPER_BINDIR}')
+ bld.SAMBA_BINARY('ctdb_mutex_fcntl_helper',
+ source='server/ctdb_mutex_fcntl_helper.c',
+ deps='ctdb-system',
+ includes='include',
+ install_path='${CTDB_HELPER_BINDIR}')
+
bld.SAMBA_GENERATOR('ctdb-smnotify-h',
source='utils/smnotify/smnotify.x',
target='utils/smnotify/smnotify.h',