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Annotation of embedaddon/rsync/connection.c, revision 1.1.1.1

1.1       misho       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: }