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/**************************************************************************** 24simple routine to do connection counting 25****************************************************************************/ 26int 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} 50