From: nobu.nokada@...
Date: 2003-06-22T10:49:48+09:00
Subject: Re: DATA object and processes; unexpected problem

Hi,

At Fri, 13 Jun 2003 20:30:48 +0900,
Andrew Walrond wrote:
> So as you suggested, the first part works fine with the sync
> I'll leave it with you then :)

It was normal.  As I wrote at [ruby-talk:73295],

> Shared file descriptors share the position even between
> processes.

Therefore, when first fd reached EOF, second fd points at EOF
too.  This is UNIX I/O model.

At least, however, seek before dup probably should be done
automatically.


Index: io.c
===================================================================
RCS file: /cvs/ruby/src/ruby/io.c,v
retrieving revision 1.213
diff -u -2 -p -r1.213 io.c
--- io.c	7 Jun 2003 15:33:40 -0000	1.213
+++ io.c	22 Jun 2003 01:07:46 -0000
@@ -2491,8 +2491,12 @@ rb_io_init_copy(dest, io)
     if (orig->f2) {
 	io_fflush(orig->f2, orig);
+	fseeko(orig->f, 0L, SEEK_CUR);
     }
     else if (orig->mode & FMODE_WRITABLE) {
 	io_fflush(orig->f, orig);
     }
+    else {
+	fseeko(orig->f, 0L, SEEK_CUR);
+    }
 
     /* copy OpenFile structure */


-- 
Nobu Nakada