From: Al Viro <viro@zeniv.linux.org.uk>
To: Dirk Gouders <dirk@gouders.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.com>,
linux-kernel@vger.kernel.org, linux-newbie@vger.kernel.org
Subject: Re: pty: childs don't always react on close(2)
Date: Fri, 5 Dec 2025 21:48:52 +0000 [thread overview]
Message-ID: <20251205214852.GL1712166@ZenIV> (raw)
In-Reply-To: <gho6oczk2f.fsf@gouders.net>
On Fri, Dec 05, 2025 at 10:37:44PM +0100, Dirk Gouders wrote:
> child_pid1 = forkpty(&pty_fd1, NULL, NULL, NULL);
You do realize that it will inherit all your opened descriptors,
including pty_fd, right?
...
> close(pty_fd);
... which doesn't do anything to the second child's descriptor
table, including the descriptor that refers to the same opened file.
IOW, the IO channel (== opened file) is very much opened after
that close() - descriptors refering to it still exist.
next prev parent reply other threads:[~2025-12-05 21:48 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-05 21:37 pty: childs don't always react on close(2) Dirk Gouders
2025-12-05 21:48 ` Al Viro [this message]
2025-12-05 22:20 ` Dirk Gouders
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