| 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 2 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, write to the Free Software Foundation, Inc., |
| 18 | * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. |
| 19 | */ |
| 20 | |
| 21 | #include "rsync.h" |
| 22 | |
| 23 | /**************************************************************************** |
| 24 | simple routine to do connection counting |
| 25 | ****************************************************************************/ |
| 26 | int claim_connection(char *fname,int max_connections) |
| 27 | { |
| 28 | int fd, i; |
| 29 | |
| 30 | if (max_connections <= 0) |
| 31 | return 1; |
| 32 | |
| 33 | fd = open(fname,O_RDWR|O_CREAT, 0600); |
| 34 | |
| 35 | if (fd == -1) { |
| 36 | return 0; |
| 37 | } |
| 38 | |
| 39 | /* find a free spot */ |
| 40 | for (i=0;i<max_connections;i++) { |
| 41 | if (lock_range(fd, i*4, 4)) return 1; |
| 42 | } |
| 43 | |
| 44 | /* only interested in open failures */ |
| 45 | errno = 0; |
| 46 | |
| 47 | close(fd); |
| 48 | return 0; |
| 49 | } |