Subject:
Re: C file operations
From:
Chris Sharman <chris.sharman@sorry.nospam>
Date:
Thu, 23 Sep 2004 18:02:48 +0100
Newsgroups:
comp.os.vms

Ed Vogel wrote:

> "Chris Sharman" <chris.sharman@sorry.nospam> wrote in message
> news:cirsm6$3ag$1$830fa7a5@news.demon.co.uk...
>
>> Is ther a way (supported or otherwise) to get at the underlying file
>> structures of standard C files ?
>
>
>     I've never used this mechanism, but reading the CRTL
>     documentation, it looks like this is possible.  The fopen
>     function will accept all the optional arguments described
>     in the creat function doc.  One of these optional args
>     is called acc_callback.  It's followed by a function pointer
>     that points to a call-back routine that is invoked just
>     before the sys$create or sys$open call.  It's passed
>     the address of the RMS FAB and RAB.
>
>     So..have a look at the CRTL documentation.


Excellent - should have spotted that one, thanks - that enables me to do everything I want, with minimal impact on the surrounding code.

David Murphy's code (posted by McKinney) would do too, but stable and supported is obviously best.

Thanks,
Chris