(9886) Opening a file for shared access?

[User]

I want to write a sequential ASCII output file and be able to display ($TYPE) the file while the image is running and the file is open.

By using fopen(fp, mode, "shr=get", "rat=cr", "rfm=var", "ctx=rec") with "w" or "a" mode, I can avoid "file locked by another user."

But even using fflush(fp) and/or fsync(fp), the output isn't being written to the disk until the file is closed. A $DIR on the file always appears as 0/<allocated> and $TYPE returns no

I'm doing this with OpenVMS 7.2-1 and DECC 6.0, but I see the same behavior with later versions.

What am I missing? How do I get the data written to the disk? I looked at the freeware examples, but they seem to address only making sure the buffers are flushed before the file is closed. I need to be able to examine the file at any time.

[Wizard]

(2867) and FAQ cover what appears to be a variant of this particular topic, and specifically a discussion of reviewing the contents of an output file while the application is running. This involves setting up the RMS file open operation for full file sharing, of course.