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/*
** Copyright 2003 Double Precision, Inc.
** See COPYING for distribution information.
*/

#include "config.h"
#include "maildirwatch.h"
#include "maildircreate.h"
#include "liblock/config.h"
#include "liblock/liblock.h"
#include "liblock/mail.h"
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>


/*
** Courier-IMAP compatible maildir lock.
*/

char *maildir_lock(const char *dir, struct maildirwatch *w,
           int *tryAnyway)
{
    struct maildir_tmpcreate_info createInfo;
    char *tmpname;
    char *newname;
    int rc;

    *tryAnyway=0;

    maildir_tmpcreate_init(&createInfo);

    createInfo.maildir=dir;
    createInfo.uniq="courierlock";
    createInfo.hostname=getenv("HOSTNAME");
    createInfo.doordie=1;

    if ((rc=maildir_tmpcreate_fd(&createInfo)) < 0)
        return NULL;
    close(rc);

    tmpname=createInfo.tmpname;
    newname=createInfo.newname;

    createInfo.tmpname=NULL;
    createInfo.newname=NULL;
    maildir_tmpcreate_free(&createInfo);

    /* HACK: newname now contains: ".../new/filename" */

    strcpy(strrchr(newname, '/')-3, WATCHDOTLOCK);

    while (ll_dotlock(newname, tmpname, 120) < 0)
    {
        if (errno == EEXIST)
        {
            if (w == NULL || maildirwatch_unlock(w, 120) < 0)
                sleep(1);
            continue;
        }

        if (errno == EAGAIN)
        {
            unlink(newname);
            sleep(5);
            continue;
        }

        free(newname);
        newname=NULL;
        *tryAnyway=1;
        break;
    }

    free(tmpname);

    return newname;
}

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