🚀 go-pugleaf

David Charlap (dic5340@hertz.njit.edu) wrote:
: In article <92349.025025DLVGC@CUNYVM.BITNET> DLVGC@CUNYVM.BITNET (Dimitri Vulis) writes:
: >I've had a similar problem (keeping the log file in the event the power
: >goes off) and simply calling fflush(fptr) after every fprintf seems to
: >commit the data to disk right away. (Including writing over a LAN Server
: >to a networked disk).  I even wrote a little function wrlog using stdargs
: >that first passes its args to fprintf(logfptr, then fflush(logfpr)'s.
: >
: >Of course, fflush _may_ work differently under gcc (I tried this with
: >both icc and ms c 6.0)
: 
: If you use OS/2 calls (like DosOpen, DosWrite, DosClose) instead of C
: library calls (like fopen, fwrite, fclose), you'll notice an option on
: DosOpen which tells the system not to cache the file handle.  This may
: do what you want it to.
[.sig deleted]
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You must've missed my original posting.

I originally wrote the program using fopen(), fwrite(), fflush().
This did not work.

I changed it to DosOpen(OPEN_FLAGS_NO_CACHE), DosWrite().  This did not
work either.

I tried DosOpen(OPEN_FLAGS_WRITE_THROUGH).  This worked, but is pretty
harsh, I don't want to pound every write directly out to disk, and I
can't allow my program to pend until the write happens.

I got it doing what I wanted by checking the time since the last write
every time I go t do a write, and doing a
DosSetFHandState(OPEN_FLAGS_WRITE_THROUGH) if it's been longer than 10
minutes, then setting it back with a DosSetFHandState(0).  This is
exactly the effact that I want, It's just a bit of a nuisance.  I'd
rather if NO_CACHE did what it sounds like it's supposed to do.