os_fsync.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1997-2005
 *      Sleepycat Software.  All rights reserved.
 *
 * $Id: os_fsync.c,v 12.3 2005/09/07 17:30:20 bostic Exp $
 */

#include "db_config.h"

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

#include <fcntl.h>                      /* Required on some platforms. */
#include <string.h>
#endif

#include "db_int.h"

#ifdef  HAVE_VXWORKS
#include "ioLib.h"

#define fsync(fd)       __vx_fsync(fd)

int
__vx_fsync(fd)
        int fd;
{
        int ret;

        /*
         * The results of ioctl are driver dependent.  Some will return the
         * number of bytes sync'ed.  Only if it returns 'ERROR' should we
         * flag it.
         */
        if ((ret = ioctl(fd, FIOSYNC, 0)) != ERROR)
                return (0);
        return (ret);
}
#endif

#ifdef __hp3000s900
#define fsync(fd)       __mpe_fsync(fd)

int
__mpe_fsync(fd)
        int fd;
{
        extern FCONTROL(short, short, void *);

        FCONTROL(_MPE_FILENO(fd), 2, NULL);     /* Flush the buffers */
        FCONTROL(_MPE_FILENO(fd), 6, NULL);     /* Write the EOF */
        return (0);
}
#endif

/*
 * __os_fsync --
 *      Flush a file descriptor.
 *
 * PUBLIC: int __os_fsync __P((DB_ENV *, DB_FH *));
 */
int
__os_fsync(dbenv, fhp)
        DB_ENV *dbenv;
        DB_FH *fhp;
{
        int ret;

        /* Check for illegal usage. */
        DB_ASSERT(F_ISSET(fhp, DB_FH_OPENED) && fhp->fd != -1);

        /*
         * Do nothing if the file descriptor has been marked as not requiring
         * any sync to disk.
         */
        if (F_ISSET(fhp, DB_FH_NOSYNC))
                return (0);

        if (DB_GLOBAL(j_fsync) != NULL)
                ret = DB_GLOBAL(j_fsync)(fhp->fd);
        else
#if defined(F_FULLFSYNC)
                RETRY_CHK((fcntl(fhp->fd, F_FULLFSYNC, 0)), ret);
#elif defined(HAVE_FDATASYNC)
                RETRY_CHK((fdatasync(fhp->fd)), ret);
#else
                RETRY_CHK((fsync(fhp->fd)), ret);
#endif

        if (ret != 0)
                __db_err(dbenv, "fsync %s", strerror(ret));
        return (ret);
}

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