/*** *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 instead of * 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 #include /* for RESETBUFFER */ #include #include #include #include /* for FOPEN */ #include #include /* 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); }