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Annotation of embedaddon/rsync/connection.c, revision 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: }