windows-xp/Source/XPSP1/NT/base/crts/crtw32/lowio/commit.c

/***
*commit.c - flush buffer to disk
*
*       Copyright (c) 1990-2001, Microsoft Corporation. All rights reserved.
*
*Purpose:
*       contains _commit() - flush buffer to disk
*
*Revision History:
*       05-25-90  SBM   initial version
*       07-24-90  SBM   Removed '32' from API names
*       09-28-90  GJF   New-style function declarator.
*       12-03-90  GJF   Appended Win32 version onto the source with #ifdef-s.
*                       It is close enough to the Cruiser version that it
*                       should be more closely merged with it later on (much
*                       later on).
*       12-04-90  SRW   Changed to include <oscalls.h> instead of <doscalls.h>
*       12-06-90  SRW   Changed to use _osfile and _osfhnd instead of _osfinfo
*       02-07-91  SRW   Changed to call _get_osfhandle [_WIN32_]
*       04-09-91  PNT   Added _MAC_ conditional
*       02-13-92  GJF   Replaced _nfile by _nhandle for Win32.
*       04-06-93  SKS   Replace _CRTAPI* with __cdecl
*       09-06-94  CFW   Remove Cruiser support.
*       01-04-95  GJF   _WIN32_ -> _WIN32
*       02-15-95  GJF   Appended Mac version of source file (somewhat cleaned
*                       up), with appropriate #ifdef-s.
*       06-11-95  GJF   Replaced _osfile[] with __osfile() (macro referencing
*                       field in ioinfo struct).
*       06-26-95  GJF   Added initial check that the file handle is open.
*       07-08-96  GJF   Replaced defined(_WIN32) with !defined(_MAC) and
*                       defined(_M_M68K) || defined(_M_MPPC) with 
*                       defined(_MAC). Removed REG1 and REG2 (old register
*                       macros). Replaced oscalls.h with windows.h. Also, 
*                       detab-ed and cleaned up the format a bit.
*       12-17-97  GJF   Exception-safe locking.
*       05-17-99  PML   Remove all Macintosh support.
*
*******************************************************************************/

#include <cruntime.h>
#include <windows.h>
#include <errno.h>
#include <io.h>
#include <internal.h>
#include <msdos.h>      /* for FOPEN */
#include <mtdll.h>
#include <stdlib.h>     /* for _doserrno */

/***
*int _commit(filedes) - flush buffer to disk
*
*Purpose:
*       Flushes cache buffers for the specified file handle to disk
*
*Entry:
*       int filedes - file handle of file
/*
*Exit:
*       returns success code
*
*Exceptions:
*
*******************************************************************************/

int __cdecl _commit (
        int filedes
        )
{
        int retval;

        /* if filedes out of range, complain */
        if ( ((unsigned)filedes >= (unsigned)_nhandle) ||
             !(_osfile(filedes) & FOPEN) )
        {
                errno = EBADF;
                return (-1);
        }

#ifdef _MT
        _lock_fh(filedes);
        __try {
                if (_osfile(filedes) & FOPEN) {
#endif  /* _MT */

        if ( !FlushFileBuffers((HANDLE)_get_osfhandle(filedes)) ) {
                retval = GetLastError();
        }
        else {
                retval = 0;     /* return success */
        }

        /* map the OS return code to C errno value and return code */
        if (retval == 0)
                goto good;

        _doserrno = retval;

#ifdef  _MT
                }
#endif

        errno = EBADF;
        retval = -1;

good :
#ifdef  _MT
        ; }
        __finally {
                _unlock_fh(filedes);
        }
#endif  /* _MT */
        return (retval);
}