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- /*
- * Support the max connections option.
- *
- * Copyright (C) 1998 Andrew Tridgell
- *
- * 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, visit the http://fsf.org website.
- */
- #include "rsync.h"
- /* A simple routine to do connection counting. This returns 1 on success
- * and 0 on failure, with errno also being set if the open() failed (errno
- * will be 0 if the lock request failed). */
- int claim_connection(char *fname, int max_connections)
- {
- int fd, i;
- if (max_connections == 0)
- return 1;
- if ((fd = open(fname, O_RDWR|O_CREAT, 0600)) < 0)
- return 0;
- /* Find a free spot. */
- for (i = 0; i < max_connections; i++) {
- if (lock_range(fd, i*4, 4))
- return 1;
- }
- close(fd);
- /* A lock failure needs to return an errno of 0. */
- errno = 0;
- return 0;
- }
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