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* Support the max connections option.

* 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 3 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, visit the http://fsf.org website.

#include "rsync.h"

/* A simple routine to do connection counting. This returns 1 on success

* and 0 on failure, with errno also being set if the open() failed (errno

* will be 0 if the lock request failed). */

int claim_connection(char *fname, int max_connections)

{

int fd, i;

if (max_connections == 0)

return 1;

if ((fd = open(fname, O_RDWR|O_CREAT, 0600)) < 0)

return 0;

/* Find a free spot. */

for (i = 0; i < max_connections; i++) {

if (lock_range(fd, i*4, 4))

return 1;

}

close(fd);

/* A lock failure needs to return an errno of 0. */

errno = 0;

return 0;

}