00001 /* 00002 Copyright (C) Andrew Tridgell 1998 00003 00004 This program is free software; you can redistribute it and/or modify 00005 it under the terms of the GNU General Public License as published by 00006 the Free Software Foundation; either version 2 of the License, or 00007 (at your option) any later version. 00008 00009 This program is distributed in the hope that it will be useful, 00010 but WITHOUT ANY WARRANTY; without even the implied warranty of 00011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00012 GNU General Public License for more details. 00013 00014 You should have received a copy of the GNU General Public License 00015 along with this program; if not, write to the Free Software 00016 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 00017 */ 00018 00019 /* support the max connections option */ 00020 #include "rsync.h" 00021 00022 00023 /**************************************************************************** 00024 simple routine to do connection counting 00025 ****************************************************************************/ 00026 int claim_connection(char *fname,int max_connections) 00027 { 00028 int fd, i; 00029 00030 if (max_connections <= 0) 00031 return 1; 00032 00033 fd = open(fname,O_RDWR|O_CREAT, 0600); 00034 00035 if (fd == -1) { 00036 return 0; 00037 } 00038 00039 /* find a free spot */ 00040 for (i=0;i<max_connections;i++) { 00041 if (lock_range(fd, i*4, 4)) return 1; 00042 } 00043 00044 /* only interested in open failures */ 00045 errno = 0; 00046 00047 close(fd); 00048 return 0; 00049 }