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rsync

    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: }