116 lines
2.5 KiB
C
116 lines
2.5 KiB
C
/***
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*commit.c - flush buffer to disk
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*
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* Copyright (c) 1990-1992, 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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*
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*******************************************************************************/
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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 <os2dll.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 _CALLTYPE1 _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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#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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#ifdef _CRUISER_
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retval = DOSRESETBUFFER(filedes);
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#else /* ndef _CRUISER_ */
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#ifdef _WIN32_
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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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#else /* ndef _WIN32_ */
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#ifdef _MAC_
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TBD();
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#else /* ndef _MAC_ */
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#error ERROR - ONLY CRUISER, WIN32, OR MAC TARGET SUPPORTED!
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#endif /* _MAC_ */
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#endif /* _WIN32_ */
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#endif /* _CRUISER_ */
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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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