Path: utzoo!attcan!uunet!lll-winken!ames!mailrus!tut.cis.ohio-state.edu!bloom-beacon!earth.cray.COM!jlf
From: jlf@earth.cray.COM (John Freeman)
Newsgroups: comp.windows.x
Subject: Re:  AsciiDiskWidgets
Message-ID: <8902231648.AA23639@thelake.cray.com>
Date: 23 Feb 89 16:48:15 GMT
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
Lines: 62

> still, the DiskWidget wants a valid
> file name at widget creation time - something I don't
> want to specify.  if the file name is null,
> XtDiskSourceCreate constructs a temp file name and
> proceeds to try to open it read only, which of course
> fails, and then exits via XtError.  do you know any
> way around this?  i hacked lib/Xaw/DiskSrc.c to create
> and close the temp file name, which produces spurious
> files, but at least it doesn't exit.
  
You are entirely correct about temporary file names in
the Disk Widget.  I did exactly as you - modified DiskSrc.c
to creat() the file, then unlink() in immediately.  
This works just fine.  I also submitted a bug report to MIT about it.
Context diffs for DiskSrc.c:

*** DiskSrc.c	Tue Oct 18 11:29:58 1988
--- DiskSrc.c.new	Tue Feb 14 11:08:36 1989
***************
*** 389,394 ****
--- 394,400 ----
      if (data->fileName == NULL) {
  	data->fileName = tmpnam (XtMalloc((unsigned)TMPSIZ));
  	data->is_tempfile = TRUE;
+ 	creat(data->fileName, 0600);
      } else
          data->is_tempfile = FALSE;
  
***************
*** 408,413 ****
--- 414,422 ----
                  XtError("Cannot open source file in XtDiskSourceCreate");
              src->Replace = DummyReplaceText;
      }
+     if (data->is_tempfile) {
+         unlink(data->fileName);		/* temp file won't be left around */
+     }
      (void) fseek(data->file, topPosition, 2);  
      data->length = ftell (data->file);  
      data->buffer = (char *) XtMalloc((unsigned)bufSize);
***************
*** 421,431 ****
  {
      DiskSourcePtr data;
      data = (DiskSourcePtr) src->data;
      XtFree((char *) data->buffer);
-     if (data->is_tempfile) {
-         unlink(data->fileName);
- 	XtFree((char *) data->fileName);
-     }
      XtFree((char *) src->data);
      XtFree((char *) src);
  }
--- 430,437 ----
  {
      DiskSourcePtr data;
      data = (DiskSourcePtr) src->data;
+     XtFree((char *) data->fileName);
      XtFree((char *) data->buffer);
      XtFree((char *) src->data);
      XtFree((char *) src);
  }