Commit | Line | Data |
---|---|---|
0f78b815 WD |
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 | |
8e41b68e WD |
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. | |
0f78b815 WD |
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 | * | |
e7c67065 | 16 | * You should have received a copy of the GNU General Public License along |
4fd842f9 | 17 | * with this program; if not, visit the http://fsf.org website. |
0f78b815 | 18 | */ |
0c515f17 | 19 | |
0f78b815 | 20 | #include "rsync.h" |
0c515f17 | 21 | |
21cafc50 WD |
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) | |
0c515f17 AT |
26 | { |
27 | int fd, i; | |
0c515f17 | 28 | |
d34cd639 | 29 | if (max_connections == 0) |
236df01b | 30 | return 1; |
8d72ef6e | 31 | |
236df01b WD |
32 | if ((fd = open(fname, O_RDWR|O_CREAT, 0600)) < 0) |
33 | return 0; | |
0c515f17 | 34 | |
236df01b WD |
35 | /* Find a free spot. */ |
36 | for (i = 0; i < max_connections; i++) { | |
37 | if (lock_range(fd, i*4, 4)) | |
38 | return 1; | |
0c515f17 AT |
39 | } |
40 | ||
236df01b WD |
41 | close(fd); |
42 | ||
21cafc50 | 43 | /* A lock failure needs to return an errno of 0. */ |
8d72ef6e | 44 | errno = 0; |
31593dd6 | 45 | return 0; |
0c515f17 | 46 | } |