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Annotation of embedaddon/rsync/connection.c, revision 1.1.1.2

1.1       misho       1: /*
                      2:  * Support the max connections option.
                      3:  *
                      4:  * Copyright (C) 1998 Andrew Tridgell
1.1.1.2 ! misho       5:  * Copyright (C) 2006-2020 Wayne Davison
1.1       misho       6:  *
                      7:  * This program is free software; you can redistribute it and/or modify
                      8:  * it under the terms of the GNU General Public License as published by
                      9:  * the Free Software Foundation; either version 3 of the License, or
                     10:  * (at your option) any later version.
                     11:  *
                     12:  * This program is distributed in the hope that it will be useful,
                     13:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
                     14:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     15:  * GNU General Public License for more details.
                     16:  *
                     17:  * You should have received a copy of the GNU General Public License along
                     18:  * with this program; if not, visit the http://fsf.org website.
                     19:  */
                     20: 
                     21: #include "rsync.h"
                     22: 
                     23: /* A simple routine to do connection counting.  This returns 1 on success
                     24:  * and 0 on failure, with errno also being set if the open() failed (errno
                     25:  * will be 0 if the lock request failed). */
                     26: int claim_connection(char *fname, int max_connections)
                     27: {
                     28:        int fd, i;
                     29: 
                     30:        if (max_connections == 0)
                     31:                return 1;
                     32: 
                     33:        if ((fd = open(fname, O_RDWR|O_CREAT, 0600)) < 0)
                     34:                return 0;
                     35: 
                     36:        /* Find a free spot. */
                     37:        for (i = 0; i < max_connections; i++) {
                     38:                if (lock_range(fd, i*4, 4))
                     39:                        return 1;
                     40:        }
                     41: 
                     42:        close(fd);
                     43: 
                     44:        /* A lock failure needs to return an errno of 0. */
                     45:        errno = 0;
                     46:        return 0;
                     47: }