os_unlink.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1997-2005
 *      Sleepycat Software.  All rights reserved.
 *
 * $Id: os_unlink.c,v 12.3 2005/08/10 15:47:27 bostic Exp $
 */

#include "db_config.h"

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>

#include <string.h>
#endif

#include "db_int.h"

/*
 * __os_region_unlink --
 *      Remove a shared memory object file.
 *
 * PUBLIC: int __os_region_unlink __P((DB_ENV *, const char *));
 */
int
__os_region_unlink(dbenv, path)
        DB_ENV *dbenv;
        const char *path;
{
#ifdef HAVE_QNX
        int ret;
        char *newname;

        if ((ret = __os_shmname(dbenv, path, &newname)) != 0)
                goto err;

        if ((ret = shm_unlink(newname)) != 0) {
                ret = __os_get_errno();
                if (ret != ENOENT)
                        __db_err(dbenv, "shm_unlink: %s: %s",
                            newname, strerror(ret));
        }
err:
        if (newname != NULL)
                __os_free(dbenv, newname);
        return (ret);
#else
        if (F_ISSET(dbenv, DB_ENV_OVERWRITE))
                (void)__db_file_multi_write(dbenv, path);

        return (__os_unlink(dbenv, path));
#endif
}

/*
 * __os_unlink --
 *      Remove a file.
 *
 * PUBLIC: int __os_unlink __P((DB_ENV *, const char *));
 */
int
__os_unlink(dbenv, path)
        DB_ENV *dbenv;
        const char *path;
{
        int ret;

        if (DB_GLOBAL(j_unlink) != NULL)
                ret = DB_GLOBAL(j_unlink)(path);
        else
#ifdef HAVE_VXWORKS
            RETRY_CHK((unlink((char *)path)), ret);
#else
            RETRY_CHK((unlink(path)), ret);
#endif
        /*
         * !!!
         * The results of unlink are file system driver specific on VxWorks.
         * In the case of removing a file that did not exist, some, at least,
         * return an error, but with an errno of 0, not ENOENT.  We do not
         * have to test for the explicitly, the RETRY_CHK macro resets "ret"
         * to be the errno, and so we'll just slide right on through.
         *
         * XXX
         * We shouldn't be testing for an errno of ENOENT here, but ENOENT
         * signals that a file is missing, and we attempt to unlink things
         * (such as v. 2.x environment regions, in DB_ENV->remove) that we
         * are expecting not to be there.  Reporting errors in these cases
         * is annoying.
         */
        if (ret != 0 && ret != ENOENT)
                __db_err(dbenv, "unlink: %s: %s", path, strerror(ret));

        return (ret);
}

---