114 lines
3.4 KiB
C
114 lines
3.4 KiB
C
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/***
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*commit.c - flush buffer to disk
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*
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* Copyright (c) 1990-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* contains _commit() - flush buffer to disk
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*
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*Revision History:
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* 05-25-90 SBM initial version
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* 07-24-90 SBM Removed '32' from API names
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* 09-28-90 GJF New-style function declarator.
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* 12-03-90 GJF Appended Win32 version onto the source with #ifdef-s.
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* It is close enough to the Cruiser version that it
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* should be more closely merged with it later on (much
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* later on).
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* 12-04-90 SRW Changed to include <oscalls.h> instead of <doscalls.h>
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* 12-06-90 SRW Changed to use _osfile and _osfhnd instead of _osfinfo
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* 02-07-91 SRW Changed to call _get_osfhandle [_WIN32_]
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* 04-09-91 PNT Added _MAC_ conditional
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* 02-13-92 GJF Replaced _nfile by _nhandle for Win32.
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 09-06-94 CFW Remove Cruiser support.
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* 01-04-95 GJF _WIN32_ -> _WIN32
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* 02-15-95 GJF Appended Mac version of source file (somewhat cleaned
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* up), with appropriate #ifdef-s.
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* 06-11-95 GJF Replaced _osfile[] with __osfile() (macro referencing
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* field in ioinfo struct).
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* 06-26-95 GJF Added initial check that the file handle is open.
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* 07-08-96 GJF Replaced defined(_WIN32) with !defined(_MAC) and
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* defined(_M_M68K) || defined(_M_MPPC) with
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* defined(_MAC). Removed REG1 and REG2 (old register
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* macros). Replaced oscalls.h with windows.h. Also,
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* detab-ed and cleaned up the format a bit.
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* 12-17-97 GJF Exception-safe locking.
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* 05-17-99 PML Remove all Macintosh support.
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <windows.h>
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#include <errno.h>
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#include <io.h>
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#include <internal.h>
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#include <msdos.h> /* for FOPEN */
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#include <mtdll.h>
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#include <stdlib.h> /* for _doserrno */
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/***
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*int _commit(filedes) - flush buffer to disk
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*
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*Purpose:
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* Flushes cache buffers for the specified file handle to disk
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*
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*Entry:
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* int filedes - file handle of file
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/*
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*Exit:
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* returns success code
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*
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*Exceptions:
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*
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*******************************************************************************/
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int __cdecl _commit (
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int filedes
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)
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{
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int retval;
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/* if filedes out of range, complain */
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if ( ((unsigned)filedes >= (unsigned)_nhandle) ||
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!(_osfile(filedes) & FOPEN) )
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{
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errno = EBADF;
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return (-1);
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}
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#ifdef _MT
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_lock_fh(filedes);
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__try {
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if (_osfile(filedes) & FOPEN) {
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#endif /* _MT */
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if ( !FlushFileBuffers((HANDLE)_get_osfhandle(filedes)) ) {
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retval = GetLastError();
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}
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else {
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retval = 0; /* return success */
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}
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/* map the OS return code to C errno value and return code */
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if (retval == 0)
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goto good;
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_doserrno = retval;
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#ifdef _MT
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}
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#endif
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errno = EBADF;
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retval = -1;
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good :
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#ifdef _MT
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; }
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__finally {
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_unlock_fh(filedes);
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}
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#endif /* _MT */
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return (retval);
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}
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