Annotation of embedaddon/rsync/connection.c, revision 1.1.1.1
1.1 misho 1: /*
2: * Support the max connections option.
3: *
4: * Copyright (C) 1998 Andrew Tridgell
5: *
6: * This program is free software; you can redistribute it and/or modify
7: * it under the terms of the GNU General Public License as published by
8: * the Free Software Foundation; either version 3 of the License, or
9: * (at your option) any later version.
10: *
11: * This program is distributed in the hope that it will be useful,
12: * but WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14: * GNU General Public License for more details.
15: *
16: * You should have received a copy of the GNU General Public License along
17: * with this program; if not, visit the http://fsf.org website.
18: */
19:
20: #include "rsync.h"
21:
22: /* A simple routine to do connection counting. This returns 1 on success
23: * and 0 on failure, with errno also being set if the open() failed (errno
24: * will be 0 if the lock request failed). */
25: int claim_connection(char *fname, int max_connections)
26: {
27: int fd, i;
28:
29: if (max_connections == 0)
30: return 1;
31:
32: if ((fd = open(fname, O_RDWR|O_CREAT, 0600)) < 0)
33: return 0;
34:
35: /* Find a free spot. */
36: for (i = 0; i < max_connections; i++) {
37: if (lock_range(fd, i*4, 4))
38: return 1;
39: }
40:
41: close(fd);
42:
43: /* A lock failure needs to return an errno of 0. */
44: errno = 0;
45: return 0;
46: }
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