From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <zsh-workers-return-42460-mason-zsh=primenet.com.au@zsh.org>
Received: (qmail 11596 invoked by alias); 14 Mar 2018 11:04:56 -0000
Mailing-List: contact zsh-workers-help@zsh.org; run by ezmlm
Precedence: bulk
X-No-Archive: yes
List-Id: Zsh Workers List <zsh-workers.zsh.org>
List-Post: <mailto:zsh-workers@zsh.org>
List-Help: <mailto:zsh-workers-help@zsh.org>
List-Unsubscribe: <mailto:zsh-workers-unsubscribe@zsh.org>
X-Seq: 42460
Received: (qmail 16986 invoked by uid 1010); 14 Mar 2018 11:04:56 -0000
X-Qmail-Scanner-Diagnostics: from mail-wm0-f44.google.com by f.primenet.com.au (envelope-from <stephane.chazelas@gmail.com>, uid 7791) with qmail-scanner-2.11 
 (clamdscan: 0.99.2/21882. spamassassin: 3.4.1.  
 Clear:RC:0(74.125.82.44):SA:0(-1.9/5.0):. 
 Processed in 0.591964 secs); 14 Mar 2018 11:04:56 -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,FREEMAIL_FROM,
	RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL,SPF_PASS,
	T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.1
X-Envelope-From: stephane.chazelas@gmail.com
X-Qmail-Scanner-Mime-Attachments: |
X-Qmail-Scanner-Zip-Files: |
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20161025;
        h=date:from:to:subject:message-id:mail-followup-to:references
         :mime-version:content-disposition:in-reply-to:user-agent;
        bh=NzvTp4/+8+p6LxRseG2F9DewvBtjscYidQ3L5RxF1nM=;
        b=cgWkOit7fxfVCiuecH/p7oTCfQBSqJq+2rwK0W/mSU9JzI9bU501x9j23K8lT7FkzQ
         tsW93+uYgLdVEyFRu07/L3AxWM03EJFUuRGx4qx/tXAmAtE3mZuYyDyffyxV8R9v9qH3
         UsQSUk/EibO7GIfoQJ7HwYOpeSmTDSC299hQIXvoMSjptiLZcx1Ja4VpRkUWX4978OZd
         +3AhokHDNOxT7k0synIEK3V9kMzPZNJ53zP1sU2qo21mbNYbJDnGm/T/P46RsYCegY3w
         mNog16oW5Bt4v/fDcFZz8U8lzNMM24fqXyXsiYOvzYi+HrKxSv/ID6jDIZK/4zq+t6k3
         AG9g==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=1e100.net; s=20161025;
        h=x-gm-message-state:date:from:to:subject:message-id:mail-followup-to
         :references:mime-version:content-disposition:in-reply-to:user-agent;
        bh=NzvTp4/+8+p6LxRseG2F9DewvBtjscYidQ3L5RxF1nM=;
        b=grbNZRa782uPUp/d3fQrqIfEIkOOgiFXdbdp9sO5kRDh2GkpszH5c6NqUg1biXMt6T
         lUyN7IDNSt3po/yr+t8dQ9Qv5qdtLa5KNHHZGgNJbUINeQu8YVZwlwuWqngzgIjm9kyb
         R7EqWj7xetozw/uSB7AHMAZysc9GmI2EgS2eCR6S+acE7ZuWXp2nyiFFfzHhDV7wFXkC
         IaTwetb+x8jb15DP3o1nYNZO+kUjBHxoBDP7vLmwGL1fkOFN4FHT8g1jbJ6VyZYEH9r5
         WvPG1fyoP4dduP5cCnOTPyE2dhOkithkXJi9/AQAtXF71WbcmTeCPeFYuUBjJDhI7hga
         dBCw==
X-Gm-Message-State: AElRT7EdcSY/ooQyFD6AwDdpiNcpiIi9+zVigzzsle65W7U4Nj5/j//o
	5T7oosXSjlqENM7kJWOgXZg04w==
X-Google-Smtp-Source: AG47ELtgMUHbcb6cGZ59ldM8mZodt8jNSRGcKFWv9bNoEEprMd4dbLxdAG6ShPStUwL9/YIyoi6Exg==
X-Received: by 10.28.142.135 with SMTP id q129mr1419408wmd.112.1521025492099;
        Wed, 14 Mar 2018 04:04:52 -0700 (PDT)
Date: Wed, 14 Mar 2018 11:04:50 +0000
From: Stephane Chazelas <stephane.chazelas@gmail.com>
To: Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: $(<nofile) doesn't set $? to non-zero
Message-ID: <20180314110450.GA14445@chaz.gmail.com>
Mail-Followup-To: Zsh hackers list <zsh-workers@zsh.org>
References: <20180314103254.GA10404@chaz.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20180314103254.GA10404@chaz.gmail.com>
User-Agent: Mutt/1.5.24 (2015-08-30)

2018-03-14 10:32:54 +0000, Stephane Chazelas:
[...]
> Note that all shells are silent and return 0 for var=$(</etc)
> var=$(</dev/mem) or any file that can be opened but not read
> successfully, which IMO is not ideal.
[...]

In zsh, one can use $ERRNO though:

$ zsh -c 'zmodload zsh/system; ERRNO=0; var=$(</); echo $? $ERRNO; syserror'
0 21
Is a directory
$ zsh -c 'zmodload zsh/system; ERRNO=0; var=$(<file); echo $? $ERRNO; syserror'
zsh:1: no such file or directory: file
0 2
No such file or directory

(same for $mapfile[file] which is silent on errors).

-- 
Stephane