From: Tanaka Akira <akr@...17n.org>
Date: 2004-12-11T01:21:53+09:00
Subject: [ruby-dev:25154] Re: 1.8 reopen problem with duplex popen

In article <87pt1ii32h.fsf@serein.a02.aist.go.jp>,
  Tanaka Akira <akr@m17n.org> writes:

> 次のように、1.8 で双方向 popen な IO を reopen するとエラーになること
> があります。

う、1.8 最新版では挙動が変わっていました。次のように core を吐きます。

% ./ruby -ve '
f = IO.popen("cat", "r+")
g = IO.popen("cat -n", "r+")
f.reopen(g)
f.puts "a"
p f.gets
'
ruby 1.8.2 (2004-12-10) [i686-linux]
-e:4:in `reopen': Invalid argument (Errno::EINVAL)
        from -e:4
-e:4: [BUG] Segmentation fault
ruby 1.8.2 (2004-12-10) [i686-linux]

zsh: abort (core dumped)  ./ruby -ve 
% gdb ruby core 
GNU gdb 6.1-debian
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-linux"...Using host libthread_db library "/lib/libthread_db.so.1".

Core was generated by `./ruby -ve 
f = IO.popen("cat", "r+")
g = IO.popen("cat -n", "r+")
f.reopen(g)
'.
Program terminated with signal 6, Aborted.
Reading symbols from /lib/libdl.so.2...done.
Loaded symbols for /lib/libdl.so.2
Reading symbols from /lib/libcrypt.so.1...done.
Loaded symbols for /lib/libcrypt.so.1
Reading symbols from /lib/libm.so.6...done.
Loaded symbols for /lib/libm.so.6
Reading symbols from /lib/libc.so.6...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
#0  0x4009e6b1 in kill () from /lib/libc.so.6
(gdb) bt
#0  0x4009e6b1 in kill () from /lib/libc.so.6
#1  0x4009e435 in raise () from /lib/libc.so.6
#2  0x4009f978 in abort () from /lib/libc.so.6
#3  0x080cc756 in rb_bug (fmt=0x0) at error.c:214
#4  0x080abd32 in sigsegv (sig=11) at signal.c:446
#5  <signal handler called>
#6  0x400db426 in fileno_unlocked () from /lib/libc.so.6
#7  0x08075acc in rb_io_fptr_finalize (fptr=0x81292e8) at io.c:1871
#8  0x0806f571 in rb_gc_call_finalizer_at_exit () at gc.c:1855
#9  0x08053e64 in ruby_finalize_1 () at eval.c:1412
#10 0x08053f73 in ruby_cleanup (ex=1) at eval.c:1447
#11 0x080540b1 in ruby_stop (ex=0) at eval.c:1478
#12 0x0805411f in ruby_run () at eval.c:1499
#13 0x08052275 in main (argc=0, argv=0x0, envp=0xbffff924) at main.c:46
(gdb) 
-- 
[田中 哲][たなか あきら][Tanaka Akira]