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Sun, 14 Feb 2021 13:24:53 -0800 (PST) MIME-Version: 1.0 References: <14ce37b2-35ca-6002-474a-7de5d6626a66@eastlink.ca> <05c3d2ba-6a00-9480-e2a8-685432e2442c@eastlink.ca> <20210214173138.GA2298446@zira.vinc17.org> <20210214211922.GA2302738@zira.vinc17.org> In-Reply-To: <20210214211922.GA2302738@zira.vinc17.org> From: Bart Schaefer Date: Sun, 14 Feb 2021 13:24:42 -0800 Message-ID: Subject: Re: detect pipe To: Zsh Users Content-Type: text/plain; charset="UTF-8" X-Seq: 26518 Archived-At: X-Loop: zsh-users@zsh.org Errors-To: zsh-users-owner@zsh.org Precedence: list Precedence: bulk Sender: zsh-users-request@zsh.org X-no-archive: yes List-Id: List-Help: List-Subscribe: List-Unsubscribe: List-Post: List-Owner: List-Archive: Archived-At: On Sun, Feb 14, 2021 at 1:19 PM Vincent Lefevre wrote: > > In any case, it is a bad idea to use a closed standard fd, unless > you know that this is supported by the command. OK, suppose I do know it's supported by the command. The proposed POSIX change appears to me to mean that I can't cause the command to receive a closed standard input, because the OS might reopen it to an undefined location during fork/exec.