Date: Fri, 23 Aug 96 16:10:00 GMT From: "Kumar, Rao CO" <KUMAR@BOGPO1.CO.unisys.com> To: "questions@freebsd.org" <questions@freebsd.org> Subject: Help! Message-ID: <321E20FC@po5.cp.unisys.com>
next in thread | raw e-mail | index | archive | help
Hello Thanks in advance for your time. I saw your mail id on the Internet. So I am sending you this mail and would highly appreciate your help. I have written a TSR (that runs on MS DOS 6.2) that intercepts the interrupt 1C (timer interrupt). What I am trying to do in this interrupt handler is some file i/o (using fopen, fread and fclose of Microsoft C). At times the system hangs. I thought it was due to some conflict in simultaneous handling of interrupt 21h by the file i/o calls inside my routine and the foreground application. So I tried to do a check for the InDOS flag before proceeding with my interrupt handling routine, but this flag is always 1 when my interrupt routine is invoked (even when there is no front end application). My questions are : 1. Why the InDOS flag is always 1 when my interrupt routine is invoked ? (my routine handles the interrupt 1C) 2. Is there any other way to know if MS DOS is executing a 21h interrput ? Thanks again. Kumar
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?321E20FC>