home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Tricks of the Windows Gam…ming Gurus (2nd Edition)
/
Disc2.iso
/
vc98
/
crt
/
src
/
commit.c
< prev
next >
Wrap
C/C++ Source or Header
|
1998-06-17
|
4KB
|
155 lines
/***
*commit.c - flush buffer to disk
*
* Copyright (c) 1990-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* contains _commit() - flush buffer to disk
*
*******************************************************************************/
#ifndef _MAC
#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);
}
_lock_fh(filedes);
/* if filedes open, try to commit, else fall through to bad */
if (_osfile(filedes) & FOPEN) {
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;
} else {
_doserrno = retval;
goto bad;
}
}
bad :
errno = EBADF;
retval = -1;
good :
_unlock_fh(filedes);
return (retval);
}
#else /* _MAC */
#include <cruntime.h>
#include <errno.h>
#include <io.h>
#include <internal.h>
#include <memory.h>
#include <msdos.h> /* for FOPEN */
#include <stdlib.h> /* for _doserrno */
#include <macos\files.h>
#include <macos\errors.h>
/***
*int _commit(fh) - 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 fh
)
{
ParamBlockRec parm;
OSErr osErr = 0;
if ((unsigned)fh >= (unsigned)_nfile || !(_osfile[fh] & FOPEN))
{
/* out of range -- return error */
errno = EBADF;
_macerrno = 0;
return -1;
}
if (!(_osfile[fh] & FDEV))
{
memset(&parm, 0, sizeof(ParamBlockRec));
parm.ioParam.ioRefNum = _osfhnd[fh];
osErr = PBFlushFileSync(&parm);
switch (osErr)
{
case noErr:
memset(&parm, 0, sizeof(ParamBlockRec));
parm.ioParam.ioVRefNum = _osVRefNum[fh];
osErr = PBFlushVolSync(&parm);
if (osErr)
{
_dosmaperr(osErr);
return -1;
}
return 0;
default:
errno = EIO;
return -1;
}
}
return 0;
}
#endif /* _MAC */