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/***
*commit.c - flush buffer to disk
*
* Copyright (c) 1990-1992, 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.
*
*******************************************************************************/
#include <cruntime.h>
#include <oscalls.h> /* for RESETBUFFER */
#include <errno.h>
#include <io.h>
#include <internal.h>
#include <msdos.h> /* for FOPEN */
#include <os2dll.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 _CALLTYPE1 _commit (
REG1 int filedes
)
{
REG2 int retval;
/* if filedes out of range, complain */
#ifdef _WIN32_
if ( (unsigned)filedes >= (unsigned)_nhandle ) {
#else
if (filedes < 0 || filedes >= _nfile) {
#endif
errno = EBADF;
return (-1);
}
_lock_fh(filedes);
/* if filedes open, try to commit, else fall through to bad */
if (_osfile[filedes] & FOPEN) {
#ifdef _CRUISER_
retval = DOSRESETBUFFER(filedes);
#else /* ndef _CRUISER_ */
#ifdef _WIN32_
if ( !FlushFileBuffers((HANDLE)_get_osfhandle(filedes)) ) {
retval = GetLastError();
} else {
retval = 0; /* return success */
}
#else /* ndef _WIN32_ */
#ifdef _MAC_
TBD();
#else /* ndef _MAC_ */
#error ERROR - ONLY CRUISER, WIN32, OR MAC TARGET SUPPORTED!
#endif /* _MAC_ */
#endif /* _WIN32_ */
#endif /* _CRUISER_ */
/* 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);
}
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