From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 9470 invoked by alias); 24 Apr 2016 18:35:41 -0000 Mailing-List: contact zsh-workers-help@zsh.org; run by ezmlm Precedence: bulk X-No-Archive: yes List-Id: Zsh Workers List List-Post: List-Help: X-Seq: 38327 Received: (qmail 27320 invoked from network); 24 Apr 2016 18:35:39 -0000 X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on f.primenet.com.au X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=brasslantern-com.20150623.gappssmtp.com; s=20150623; h=from:message-id:date:in-reply-to:comments:references:to:subject :mime-version; bh=o5KSM5iHo3JtnU8rzt7IaiaVsAHlZ0gdcl5AWL6XUF4=; b=eE/zVqFc90LOAUcDVrD5LCFOBKR+uSK0e1M8sBakHC+cypuAybo+FfB/cYK4W3UCZK cvU21oZAEzBVFk/8+7frRmTadcAdqjULJBUYp2X3Te1nqcYA12RaROlHIXqKPdD0y+X8 9zAKvB2XsyCSBe+XM2ckjc4o8VlvvapQn1Qlilb9yYBasPXdrziOUm2AZQoX//FNJm1V 2QBN/EGAdN8VOFbcHxaZ8ri2l5b1bCeAqNd+KTjXxsdUy9ziPZ1kFiYS6KiHqwyK/fp0 s2mnKmiP0UAZZ4mZL6jztMHqchvlZVDJe0cbN5yGZ15GdVORTLddyU44iSccyTMFIwJf 23Rg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:message-id:date:in-reply-to:comments :references:to:subject:mime-version; bh=o5KSM5iHo3JtnU8rzt7IaiaVsAHlZ0gdcl5AWL6XUF4=; b=fOvb1KcntLprDurF+WR0Lktzc+PO4tM24Q9gXmwtPo4ZNbL11OyflWUtuj7ui6AcE6 j2InEHDDnk12hJwBrj7O9owSzvOgfUbCK1WLYgjXNSkMolDL/sWgJtIOTducu99lRWwE Wh9ofA8kvFlPTmLHdwzEhi0jHziIhY8IRDB/1AL+RywKq5GjhKkfj4cq9LxANZLngXlW Cx6DwQBuHFHVpLe7SnievNZnGZWSZsgOxa10sfWz00mLs+qgw1jWunfGMAA71HCEcc18 B+Ty2pf3WT9Bv7NXluWAWQyYata5Yj38qYQLAu2KrYHeQ0AiZHke3iJOVE6NRXpJBpNi LGpQ== X-Gm-Message-State: AOPr4FUk4tlapo+9v9sS3NUJ53clrEMs7ZMbxYzjDG81dcGUJykkwkftr/aQ1dnGzWOahw== X-Received: by 10.66.189.166 with SMTP id gj6mr43386271pac.158.1461522937864; Sun, 24 Apr 2016 11:35:37 -0700 (PDT) From: Bart Schaefer Message-Id: <160424113558.ZM3564@torch.brasslantern.com> Date: Sun, 24 Apr 2016 11:35:58 -0700 In-Reply-To: <571CFD70.7090506@matrix.ai> Comments: In reply to Roger Qiu "Re: Possible ZSH bug with IO direction" (Apr 25, 3:08am) References: <571BBF3C.50402@matrix.ai> <160423151436.ZM6912@torch.brasslantern.com> <571CFD70.7090506@matrix.ai> X-Mailer: OpenZMail Classic (0.9.2 24April2005) To: zsh-workers@zsh.org Subject: Re: Possible ZSH bug with IO direction MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii On Apr 25, 3:08am, Roger Qiu wrote: } Subject: Re: Possible ZSH bug with IO direction } } Thanks, the workaround did work. But I've never seen read & write } redirection at the interactive prompt. Does that make the STDIN for the } program I'm running readable and writable? Yes. } How does that work? Stdin/out/err are just file descriptors 0/1/2. They can be open in whatever mode the parent process likes. It wouldn't make much sense to have stdin open for write only, but nothing prevents that. Consider that /dev/tty is all of stdin/out/err for most interactive programs. It's open read/write even though programs don't usually treat the individual descriptors that way. } Can the program then rewind that descriptor, and write to `input.jpg`? If the program were using system-call interfaces on descriptor 0, yes. However the STDIO library object STDIN will still be initialized for reading only, so in most cases the program won't notice. } Also since Bash doesn't suffer from this problem, will this be fixed } eventually? As the comment from main.c explains, it's a question of either breaking a few external programs that care about raw file data, or breaking the entire internal string-processing in e.g. zsh's parameter substitution any time those strings are read from a file. So I would expect the answer is that this won't change unless Cygwin changes something. Also, we're woefully short on any volunteers for Windows-specific issues.