Re: Win32 and fsync()

>I'm having difficulty digging up the reference, but I think I recall
seeing >something that said, roughly, on W32 there are 2 sets of buffers
- those in >the user level library and those in the kernel level driver,
and >FlushFileBuffers drains the first, while _commit drains both (it
includes a >call to FlushFileBuffers).

You were correct: here is the source.

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);
}