connection.c

/* 
   Copyright (C) Andrew Tridgell 1998
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/* support the max connections option */
#include "rsync.h"


/****************************************************************************
simple routine to do connection counting
****************************************************************************/
int claim_connection(char *fname,int max_connections)
{
	int fd, i;

	if (max_connections <= 0)
		return 1;

	fd = open(fname,O_RDWR|O_CREAT, 0600);

	if (fd == -1) {
		return 0;
	}

	/* find a free spot */
	for (i=0;i<max_connections;i++) {
		if (lock_range(fd, i*4, 4)) return 1;
	}		

	/* only interested in open failures */
	errno = 0;

	close(fd);
	return 0;
}