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Subject: Re: bug#77535: timeout treats very short durations as `0`
To: Nicolas Boichat <nicolas@HIDDEN>, 77535-done <at> debbugs.gnu.org
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On 04/04/2025 16:26, Nicolas Boichat wrote:
> Hi,
>
> Version: timeout (GNU coreutils) 9.6, Archlinux, x86-64.
>
> While playing with different duration parameters to `timeout`, I
> noticed that extremely short durations, like `1e-3000`, are rounded
> down to `0`. The problem is that `0` has a special meaning (disabling
> the timeout), so I don't think this is desired.
>
> All of these commands exit immediately:
> ```
> timeout 0.0001 cat
> timeout 1e-100 cat
> timeout 1e-300 cat
> timeout 1e-323 cat
> ```
>
> But these never exits:
> ```
> timeout 1e-324 cat
> timeout 1e-3000 cat
> ```
>
> As if we had typed:
> ```
> timeout 0 cat
> ```
>
> I think there is some logic in `printf` to handle float parsing
> underflow, so maybe this can be reused in `timeout` as well.
The following should avoid this issue.
Marking this as done.
thanks!
Pádraig
diff --git a/src/timeout.c b/src/timeout.c
index 578d71070..6756cd888 100644
--- a/src/timeout.c
+++ b/src/timeout.c
@@ -371,6 +371,10 @@ parse_duration (char const *str)
usage (EXIT_CANCELED);
}
+ /* Clamp underflow to 1ns, as 0 disables the timeout. */
+ if (duration == 0 && errno == ERANGE)
+ duration = 1e-9;
+
return duration;
}
Nicolas Boichat <nicolas@HIDDEN>:Pádraig Brady <P@HIDDEN>:Received: (at submit) by debbugs.gnu.org; 4 Apr 2025 16:12:15 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Fri Apr 04 12:12:15 2025 Received: from localhost ([127.0.0.1]:39665 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1u0jeR-0008HO-7l for submit <at> debbugs.gnu.org; Fri, 04 Apr 2025 12:12:15 -0400 Received: from lists.gnu.org ([2001:470:142::17]:43010) by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.84_2) (envelope-from <nicolas.boichat@HIDDEN>) id 1u0ix5-00067z-5d for submit <at> debbugs.gnu.org; Fri, 04 Apr 2025 11:27:27 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <nicolas.boichat@HIDDEN>) id 1u0iwq-00066D-QB for bug-coreutils@HIDDEN; Fri, 04 Apr 2025 11:27:13 -0400 Received: from mail-io1-f42.google.com ([209.85.166.42]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from <nicolas.boichat@HIDDEN>) id 1u0iwp-0005If-6M for bug-coreutils@HIDDEN; Fri, 04 Apr 2025 11:27:12 -0400 Received: by mail-io1-f42.google.com with SMTP id ca18e2360f4ac-85b4277d03fso81705639f.1 for <bug-coreutils@HIDDEN>; Fri, 04 Apr 2025 08:27:10 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1743780429; x=1744385229; h=to:subject:message-id:date:from:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=kMIAk8BIWY1vriXK6/7sVpHCFuZdumn0ziOYcRZh5wg=; b=VdViJk6eKzdjmOQ8e2RixVPrUpjeP1stzk1v5k5kMBsebRqmSuchiR/ZSyuD08INEV nuDTHkcvq3by7YyDDyIwRmEMCjcC6QZLllOIXTpek7rjmtWwAlbOSigq3x6k0YcsYDgT VAl8B+/vf2Yoz6DjyaWrERe1m++SEkVFrvZtm1Tq7obrcoyNLy+jVEhXptLHJLssiYk0 hdTiK7tIZ21sm7PlLcdtKrjVZQCVNClCOC56/nf2rgUOQ7N3fYS9kAhjhLjWHl4qL2PX 3aTkeYwqVxripHaCQ3QWXHKvn+JDNGS2IQa1YRkA/LCG8K6l3PgLpHGhV5T0VbCYIUyU j8Eg== X-Gm-Message-State: AOJu0YzjncONw5Pbrpb20Wc+4IyqN5F7PvcFIKRQo6cnH6hDYa22O1I7 LLxKPtLJJlpccwHocFdemXx/fVS7RiaRKkEhmC8FCNbwUEPsWFiQBNwnrkD2pnWjD7HY0OXRkCg EW+4y3DL+q8I+z7/owBJptltl53luvBPPjEY= X-Gm-Gg: ASbGncve+HU+XwWkLd94E876hDbcisZQCiCwwPVLJwTK8SNZEWrKuv1tYWPsOTeVwLu 6GKSpEVZpxPEDh/e5sptbCD9s1Qy0oOz2pIMAOLxRzEO5uYUrdU8n15vqHm/5/Hm8GNf7V49Hbv fjpD4T1eGEt6OrjvGJEWVbf+Zgy43vAzqf34E= X-Google-Smtp-Source: AGHT+IGCEUgbNbaSUg+ijpRv0pQg+j6Ypa7RBrPPFwIyvyF/PLYYCodJs3relLklUxHYbQNZoOGaa3OipvrDASwceBg= X-Received: by 2002:a05:6e02:3701:b0:3ce:4b12:fa17 with SMTP id e9e14a558f8ab-3d6e3f7f812mr45735545ab.19.1743780428844; Fri, 04 Apr 2025 08:27:08 -0700 (PDT) MIME-Version: 1.0 From: Nicolas Boichat <nicolas@HIDDEN> Date: Fri, 4 Apr 2025 17:26:56 +0200 X-Gm-Features: ATxdqUEoSIp3-7q8UzAhlw1H5z2kM9CSaO2hZ_WSwYIA0wWPqIMo8N1xHgLhNZ8 Message-ID: <CAM6NUi5isNtqv5-UqtA4yMBTZcs1+sMLJ6uQvKn7QpE7pSS0dg@HIDDEN> Subject: timeout treats very short durations as `0` To: bug-coreutils@HIDDEN Content-Type: text/plain; charset="UTF-8" Received-SPF: pass client-ip=209.85.166.42; envelope-from=nicolas.boichat@HIDDEN; helo=mail-io1-f42.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, FREEMAIL_FORGED_FROMDOMAIN=0.001, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Score: 1.0 (+) X-Debbugs-Envelope-To: submit X-Mailman-Approved-At: Fri, 04 Apr 2025 12:12:13 -0400 X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -0.0 (/) Hi, Version: timeout (GNU coreutils) 9.6, Archlinux, x86-64. While playing with different duration parameters to `timeout`, I noticed that extremely short durations, like `1e-3000`, are rounded down to `0`. The problem is that `0` has a special meaning (disabling the timeout), so I don't think this is desired. All of these commands exit immediately: ``` timeout 0.0001 cat timeout 1e-100 cat timeout 1e-300 cat timeout 1e-323 cat ``` But these never exits: ``` timeout 1e-324 cat timeout 1e-3000 cat ``` As if we had typed: ``` timeout 0 cat ``` I think there is some logic in `printf` to handle float parsing underflow, so maybe this can be reused in `timeout` as well. Thanks,
Nicolas Boichat <nicolas@HIDDEN>:bug-coreutils@HIDDEN.
Full text available.bug-coreutils@HIDDEN:bug#77535; Package coreutils.
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