114 lines
3.4 KiB
C
114 lines
3.4 KiB
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);
|
|
}
|