185 lines
3.9 KiB
C
185 lines
3.9 KiB
C
/***
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*commit.c - flush buffer to disk
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*
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* Copyright (c) 1990-1995, 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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*
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*******************************************************************************/
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#ifdef _WIN32
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#include <cruntime.h>
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#include <oscalls.h> /* for RESETBUFFER */
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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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REG1 int filedes
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)
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{
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REG2 int retval;
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/* if filedes out of range, complain */
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#ifdef _WIN32
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if ( ((unsigned)filedes >= (unsigned)_nhandle) ||
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!(_osfile(filedes) & FOPEN) )
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{
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#else
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if (filedes < 0 || filedes >= _nfile) {
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#endif
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errno = EBADF;
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return (-1);
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}
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_lock_fh(filedes);
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/* if filedes open, try to commit, else fall through to bad */
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if (_osfile(filedes) & FOPEN) {
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if ( !FlushFileBuffers((HANDLE)_get_osfhandle(filedes)) ) {
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retval = GetLastError();
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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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} else {
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_doserrno = retval;
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goto bad;
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}
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}
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bad :
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errno = EBADF;
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retval = -1;
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good :
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_unlock_fh(filedes);
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return (retval);
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}
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#else /* ndef _WIN32 */
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#if defined(_M_MPPC) || defined(_M_M68K)
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#include <cruntime.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 <memory.h>
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#include <msdos.h> /* for FOPEN */
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#include <stdlib.h> /* for _doserrno */
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#include <macos\files.h>
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#include <macos\errors.h>
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/***
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*int _commit(fh) - 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 fh
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)
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{
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ParamBlockRec parm;
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OSErr osErr = 0;
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if ((unsigned)fh >= (unsigned)_nfile || !(_osfile[fh] & FOPEN))
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{
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/* out of range -- return error */
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errno = EBADF;
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_macerrno = 0;
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return -1;
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}
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if (!(_osfile[fh] & FDEV))
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{
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memset(&parm, 0, sizeof(ParamBlockRec));
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parm.ioParam.ioRefNum = _osfhnd[fh];
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osErr = PBFlushFileSync(&parm);
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switch (osErr)
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{
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case noErr:
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memset(&parm, 0, sizeof(ParamBlockRec));
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parm.ioParam.ioVRefNum = _osVRefNum[fh];
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osErr = PBFlushVolSync(&parm);
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if (osErr)
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{
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_dosmaperr(osErr);
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return -1;
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}
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return 0;
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default:
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errno = EIO;
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return -1;
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}
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}
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return 0;
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}
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#endif /* defined(_M_MPPC) || defined(_M_M68K) */
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#endif /* _WIN32 */
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