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Subject: Re: bug#77535: timeout treats very short durations as `0`
From: =?UTF-8?Q?P=C3=A1draig_Brady?= <P@HIDDEN>
To: Philip Rowlands <phr+coreutils@HIDDEN>, 77535 <at> debbugs.gnu.org
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--------------jQ8OgWMCfctDAWeHt45GE070
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On 05/04/2025 19:45, Pádraig Brady wrote:
> On 05/04/2025 19:02, Philip Rowlands wrote:
>> I was interested to see that the code makes uses of strtod, and how this interacts with the minute / hour / day suffix.
>>
>> $ strace -e trace=clock_nanosleep sleep 3
>> clock_nanosleep(CLOCK_REALTIME, 0, {tv_sec=3, tv_nsec=0},
>>
>> $ strace -e trace=clock_nanosleep sleep 0xas
>> clock_nanosleep(CLOCK_REALTIME, 0, {tv_sec=10, tv_nsec=0},
>>
>> $ strace -e trace=clock_nanosleep sleep 0xam
>> clock_nanosleep(CLOCK_REALTIME, 0, {tv_sec=600, tv_nsec=0},
>>
>> $ strace -e trace=clock_nanosleep sleep 0xad
>> clock_nanosleep(CLOCK_REALTIME, 0, {tv_sec=173, tv_nsec=0},
>>
>> Here 0xad is interpreted as 173 seconds, not 10 days.
>>
>> It's a corner case, but should sleep(1) support or tolerate hex input, and if so, how should it handle the "d" suffix? FWIW I'd just vote to return an error for hex intervals.
>
> Good point :)
> Given FreeBSD and ksh sleep implementations also behave like GNU,
> we should probably just document the edge case that
> (day) suffixes are best avoided with hex inputs.
>
> ~$ ksh
> $ type sleep
> sleep is a shell builtin
> $ time sleep 0x10d
> real 4m29.00s
I'll apply the attached later to document this.
cheers,
Pádraig
--------------jQ8OgWMCfctDAWeHt45GE070
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Subject: Re: bug#77535: timeout treats very short durations as `0`
To: Philip Rowlands <phr+coreutils@HIDDEN>,
Paul Eggert <eggert@HIDDEN>, 77535 <at> debbugs.gnu.org
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On 05/04/2025 19:02, Philip Rowlands wrote:
> I was interested to see that the code makes uses of strtod, and how this interacts with the minute / hour / day suffix.
>
> $ strace -e trace=clock_nanosleep sleep 3
> clock_nanosleep(CLOCK_REALTIME, 0, {tv_sec=3, tv_nsec=0},
>
> $ strace -e trace=clock_nanosleep sleep 0xas
> clock_nanosleep(CLOCK_REALTIME, 0, {tv_sec=10, tv_nsec=0},
>
> $ strace -e trace=clock_nanosleep sleep 0xam
> clock_nanosleep(CLOCK_REALTIME, 0, {tv_sec=600, tv_nsec=0},
>
> $ strace -e trace=clock_nanosleep sleep 0xad
> clock_nanosleep(CLOCK_REALTIME, 0, {tv_sec=173, tv_nsec=0},
>
> Here 0xad is interpreted as 173 seconds, not 10 days.
>
> It's a corner case, but should sleep(1) support or tolerate hex input, and if so, how should it handle the "d" suffix? FWIW I'd just vote to return an error for hex intervals.
Good point :)
Given FreeBSD and ksh sleep implementations also behave like GNU,
we should probably just document the edge case that
(day) suffixes are best avoided with hex inputs.
~$ ksh
$ type sleep
sleep is a shell builtin
$ time sleep 0x10d
real 4m29.00s
cheers,
Pádraig
bug-coreutils@HIDDEN:bug#77535; Package coreutils.
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Date: Sat, 05 Apr 2025 19:02:24 +0100
From: "Philip Rowlands" <phr+coreutils@HIDDEN>
To: =?UTF-8?Q?P=C3=A1draig_Brady?= <P@HIDDEN>,
"Paul Eggert" <eggert@HIDDEN>, 77535 <at> debbugs.gnu.org
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Subject: Re: bug#77535: timeout treats very short durations as `0`
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I was interested to see that the code makes uses of strtod, and how this interacts with the minute / hour / day suffix.
$ strace -e trace=clock_nanosleep sleep 3
clock_nanosleep(CLOCK_REALTIME, 0, {tv_sec=3, tv_nsec=0},
$ strace -e trace=clock_nanosleep sleep 0xas
clock_nanosleep(CLOCK_REALTIME, 0, {tv_sec=10, tv_nsec=0},
$ strace -e trace=clock_nanosleep sleep 0xam
clock_nanosleep(CLOCK_REALTIME, 0, {tv_sec=600, tv_nsec=0},
$ strace -e trace=clock_nanosleep sleep 0xad
clock_nanosleep(CLOCK_REALTIME, 0, {tv_sec=173, tv_nsec=0},
Here 0xad is interpreted as 173 seconds, not 10 days.
It's a corner case, but should sleep(1) support or tolerate hex input, and if so, how should it handle the "d" suffix? FWIW I'd just vote to return an error for hex intervals.
Cheers,
Phil
bug-coreutils@HIDDEN:bug#77535; Package coreutils.
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[86.44.211.146]) by smtp.googlemail.com with ESMTPSA id ffacd0b85a97d-39c30226cf6sm6505742f8f.87.2025.04.05.04.03.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 05 Apr 2025 04:03:50 -0700 (PDT) Content-Type: multipart/mixed; boundary="------------HAUvQaIq0TZ85wYGNjgbvivM" Message-ID: <f595dee9-d48a-41a1-88cd-7de592b3e12d@HIDDEN> Date: Sat, 5 Apr 2025 12:03:49 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Beta Subject: Re: bug#77535: timeout treats very short durations as `0` To: Paul Eggert <eggert@HIDDEN>, 77535 <at> debbugs.gnu.org References: <CAM6NUi5isNtqv5-UqtA4yMBTZcs1+sMLJ6uQvKn7QpE7pSS0dg@HIDDEN> <a1cfeefb-ca6d-42a5-8701-8e8c0d607b87@HIDDEN> <4ee5b797-d038-4392-8c43-d3321903f38e@HIDDEN> Content-Language: en-US From: =?UTF-8?Q?P=C3=A1draig_Brady?= <P@HIDDEN> In-Reply-To: <4ee5b797-d038-4392-8c43-d3321903f38e@HIDDEN> X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 77535 Cc: nicolas@HIDDEN 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: -1.0 (-) This is a multi-part message in MIME format. --------------HAUvQaIq0TZ85wYGNjgbvivM Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 05/04/2025 09:03, Paul Eggert wrote: > On 2025-04-04 12:27, Pádraig Brady wrote: >> + /* Clamp underflow to 1ns, as 0 disables the timeout. */ >> + if (duration == 0 && errno == ERANGE) >> + duration = 1e-9; > > That isn't exactly right as the 1e-9 double-rounds to 2e-9 when we > compute the struct timespec. Also, even with the patch the code > mishandles 16777216.000000001 (2**24 + 10**-9) by treating it as if it > were just 16777216. These are tiny bugs, I know, but I took up the > challenge of doing this things more correctly by installing the attached. This is the first time coreutils is linking with libm. So practically that does add measurable overhead: $ time seq 10000 | xargs -n1 src/timeout-old >/dev/null real 0m7.139s $ time seq 10000 | xargs -n1 src/timeout >/dev/null real 0m8.161s So on my 2.6GHz i7-5600U we're adding 102,200 ns to the startup time, to address theoretical single nanosecond issues. Given the code is also more complex, I'm thinking using libm is not worth it? BTW I'll apply the attached cleanups if we keep the libm dependency. cheers, Pádraig --------------HAUvQaIq0TZ85wYGNjgbvivM Content-Type: text/x-patch; charset=UTF-8; name="timeout-round-tweaks.patch" Content-Disposition: attachment; filename="timeout-round-tweaks.patch" Content-Transfer-Encoding: base64 RnJvbSA0MzY4ZDIxZmJkZGFmNTM5NzA4NzIxMGM0OWIzOTg0MTRlMDJjOTMzIE1vbiBTZXAg MTcgMDA6MDA6MDAgMjAwMQpGcm9tOiA9P1VURi04P3E/UD1DMz1BMWRyYWlnPTIwQnJhZHk/ PSA8UEBkcmFpZ0JyYWR5LmNvbT4KRGF0ZTogU2F0LCA1IEFwciAyMDI1IDExOjI3OjMyICsw MTAwClN1YmplY3Q6IFtQQVRDSF0gbWFpbnQ6IGFkanVzdG1lbnRzIHRvIHJlY2VudCB0aW1l b3V0IGNoYW5nZQoKKiAuZ2l0aWdub3JlOiBBZGQgL2xpYi9mZW52LmggdG8gaWdub3JlIGxp c3QuCiogdGVzdHMvdGltZW91dC90aW1lb3V0LXBhcmFtZXRlcnMuc2g6IFVzZSBhIHNsZWVw IGxlbmd0aCBvZiAxMHMKdG8gYmUgY29uc2lzdGVudCB3aXRoIHRoZSBwYXR0ZXJuIHdoZXJl IHdlIHVzZSB0aGlzIGxhcmdlciB0aW1lCndoZW4gaXQgZG9lcyBub3Qgc2xvdyBkb3duIGEg dGVzdCwgYnV0IGFsc28gcHJvdmlkZXMgcHJvdGVjdGlvbgphZ2FpbnN0IGEgaHVuZyB0ZXN0 LCBhbmQgYmV0dGVyIGF2b2lkYW5jZSBvZiBmYWxzZSBmYWlsdXJlcyBkdWUKdG8gcmFjZXMg b24gdmVyeSBsb2FkZWQgc3lzdGVtcy4gIEFsc28gZml4IHRoZSBzZXR0aW5nIG9mIEZBSUwu CiogdGVzdHMvdGltZW91dC90aW1lb3V0LWxhcmdlLXBhcmFtZXRlcnMuc2g6IFJlbW92ZSBk dXBsaWNhdGVkIHRlc3QuCi0tLQogLmdpdGlnbm9yZSAgICAgICAgICAgICAgICAgICAgICAg ICAgICAgICAgfCAxICsKIHRlc3RzL3RpbWVvdXQvdGltZW91dC1sYXJnZS1wYXJhbWV0ZXJz LnNoIHwgMyAtLS0KIHRlc3RzL3RpbWVvdXQvdGltZW91dC1wYXJhbWV0ZXJzLnNoICAgICAg IHwgMiArLQogMyBmaWxlcyBjaGFuZ2VkLCAyIGluc2VydGlvbnMoKyksIDQgZGVsZXRpb25z KC0pCgpkaWZmIC0tZ2l0IGEvLmdpdGlnbm9yZSBiLy5naXRpZ25vcmUKaW5kZXggZjRhMTdh ZDA0Li40ZGMzOWFlNTUgMTAwNjQ0Ci0tLSBhLy5naXRpZ25vcmUKKysrIGIvLmdpdGlnbm9y ZQpAQCAtNjcsNiArNjcsNyBAQAogL2xpYi9lcnJuby5oCiAvbGliL2Vycm9yLmgKIC9saWIv ZmNudGwuaAorL2xpYi9mZW52LmgKIC9saWIvZmxvYXQuaAogL2xpYi9mbm1hdGNoLmgKIC9s aWIvZ2V0b3B0LWNkZWZzLmgKZGlmZiAtLWdpdCBhL3Rlc3RzL3RpbWVvdXQvdGltZW91dC1s YXJnZS1wYXJhbWV0ZXJzLnNoIGIvdGVzdHMvdGltZW91dC90aW1lb3V0LWxhcmdlLXBhcmFt ZXRlcnMuc2gKaW5kZXggYTUzOTVkMTUzLi41NjY5ODEwZTggMTAwNzU1Ci0tLSBhL3Rlc3Rz L3RpbWVvdXQvdGltZW91dC1sYXJnZS1wYXJhbWV0ZXJzLnNoCisrKyBiL3Rlc3RzL3RpbWVv dXQvdGltZW91dC1sYXJnZS1wYXJhbWV0ZXJzLnNoCkBAIC00Myw3ICs0Myw0IEBAIHRpbWVv dXQgMi4zNGUrNWQgc2xlZXAgMCB8fCBmYWlsPTEKIHRpbWVvdXQgJExEQkxfTUFYIHNsZWVw IDAgfHwgZmFpbD0xCiByZXR1cm5zXyAxMjUgdGltZW91dCAtLSAtJExEQkxfTUFYIHNsZWVw IDAgfHwgZmFpbD0xCiAKLSMgRW5zdXJlIHVuZGVyZmxvdyB0aW1lcyBvdXQgaW1tZWRpYXRl bHkKLXJldHVybnNfIDEyNCB0aW1lb3V0IDFlLTUwMDAgc2xlZXAgMTAgfHwgZmFpbD0xCi0K IEV4aXQgJGZhaWwKZGlmZiAtLWdpdCBhL3Rlc3RzL3RpbWVvdXQvdGltZW91dC1wYXJhbWV0 ZXJzLnNoIGIvdGVzdHMvdGltZW91dC90aW1lb3V0LXBhcmFtZXRlcnMuc2gKaW5kZXggNDA4 ODQ2MjYyLi5jNGIyMjAyYjQgMTAwNzU1Ci0tLSBhL3Rlc3RzL3RpbWVvdXQvdGltZW91dC1w YXJhbWV0ZXJzLnNoCisrKyBiL3Rlc3RzL3RpbWVvdXQvdGltZW91dC1wYXJhbWV0ZXJzLnNo CkBAIC00MSw3ICs0MSw3IEBAIHRpbWVvdXQgMTAuMzQgc2xlZXAgMCB8fCBmYWlsPTEKIHRp bWVvdXQgOS45OTk5OTk5OTkgc2xlZXAgMCB8fCBmYWlsPTEKIAogIyByb3VuZCB1bmRlcmZs b3cgdXAgdG8gMSBucwotcmV0dXJuc18gMTI0IHRpbWVvdXQgMWUtMTAwMDAgc2xlZXAgMSB8 fCBmYWlsCityZXR1cm5zXyAxMjQgdGltZW91dCAxZS0xMDAwMCBzbGVlcCAxMCB8fCBmYWls PTEKIAogIyBpbnZhbGlkIHNpZ25hbCBzcGVjCiByZXR1cm5zXyAxMjUgdGltZW91dCAtLXNp Z25hbD1pbnZhbGlkIDEgc2xlZXAgMCB8fCBmYWlsPTEKLS0gCjIuNDguMQoK --------------HAUvQaIq0TZ85wYGNjgbvivM--
bug-coreutils@HIDDEN:bug#77535; Package coreutils.
Full text available.Received: (at 77535) by debbugs.gnu.org; 5 Apr 2025 08:04:00 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Sat Apr 05 04:04:00 2025 Received: from localhost ([127.0.0.1]:41376 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1u0yVT-0003Sl-Fn for submit <at> debbugs.gnu.org; Sat, 05 Apr 2025 04:04:00 -0400 Received: from mail.cs.ucla.edu ([131.179.128.66]:55240) by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.84_2) (envelope-from <eggert@HIDDEN>) id 1u0yVQ-0003SX-HJ for 77535 <at> debbugs.gnu.org; Sat, 05 Apr 2025 04:03:57 -0400 Received: from localhost (localhost [127.0.0.1]) by mail.cs.ucla.edu (Postfix) with ESMTP id E7F863C0149CA; Sat, 5 Apr 2025 01:03:49 -0700 (PDT) Received: from mail.cs.ucla.edu ([127.0.0.1]) by localhost (mail.cs.ucla.edu [127.0.0.1]) (amavis, port 10032) with ESMTP id fZIJKelzlj8T; Sat, 5 Apr 2025 01:03:49 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by mail.cs.ucla.edu (Postfix) with ESMTP id 5495C3C0149D0; Sat, 5 Apr 2025 01:03:49 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.10.3 mail.cs.ucla.edu 5495C3C0149D0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cs.ucla.edu; s=9D0B346E-2AEB-11ED-9476-E14B719DCE6C; t=1743840229; bh=E1zpVsIO71L7uSN1MolCua/E1wCB5bqu5QLUqXZll80=; h=Message-ID:Date:MIME-Version:To:From; b=Z31bYHN4x1GAG9vF/kOLTZn9tp4vNQfgsWJSNXec4sFeFDPDK/nb7uXN/sH4/BZ4z Kkw4o4FjrMS5xOq8As4XXa+9Od1FwVIklB0i7C/HFWAk1+AaXPxv2Sm+2Yfi9+haV8 ju+Qh7HLknvBoTtGhK3letjAX06h47h7YHr9dSugVBnDKwDit8d65rP45BAnPfkTac O4Zz29xnQwJJzJ6ako4X96cE0LwKTX2mPZy2Fhl0pggftneXKRBRzXNlKtShGY/g6l Y2JmH20ClGJzsBGxc8+cczLAvq3Sqd57ZSIh+JMDX0spTTMUtZq/epwWXe8kleE9uM minFmluT5S3tQ== X-Virus-Scanned: amavis at mail.cs.ucla.edu Received: from mail.cs.ucla.edu ([127.0.0.1]) by localhost (mail.cs.ucla.edu [127.0.0.1]) (amavis, port 10026) with ESMTP id b3zlIJdQ1HrN; Sat, 5 Apr 2025 01:03:49 -0700 (PDT) Received: from [192.168.254.12] (47-147-225-25.fdr01.snmn.ca.ip.frontiernet.net [47.147.225.25]) by mail.cs.ucla.edu (Postfix) with ESMTPSA id 3094E3C0149CA; Sat, 5 Apr 2025 01:03:49 -0700 (PDT) Content-Type: multipart/mixed; boundary="------------H2q1gelg9asgz40i29t5buIH" Message-ID: <4ee5b797-d038-4392-8c43-d3321903f38e@HIDDEN> Date: Sat, 5 Apr 2025 01:03:48 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: bug#77535: timeout treats very short durations as `0` To: 77535 <at> debbugs.gnu.org References: <CAM6NUi5isNtqv5-UqtA4yMBTZcs1+sMLJ6uQvKn7QpE7pSS0dg@HIDDEN> <a1cfeefb-ca6d-42a5-8701-8e8c0d607b87@HIDDEN> Content-Language: en-US From: Paul Eggert <eggert@HIDDEN> Organization: UCLA Computer Science Department In-Reply-To: <a1cfeefb-ca6d-42a5-8701-8e8c0d607b87@HIDDEN> X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 77535 Cc: nicolas@HIDDEN, P@HIDDEN 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: -1.0 (-) This is a multi-part message in MIME format. --------------H2q1gelg9asgz40i29t5buIH Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable On 2025-04-04 12:27, P=C3=A1draig Brady wrote: > +=C2=A0 /* Clamp underflow to 1ns, as 0 disables the timeout.=C2=A0 */ > +=C2=A0 if (duration =3D=3D 0 && errno =3D=3D ERANGE) > +=C2=A0=C2=A0=C2=A0 duration =3D 1e-9; That isn't exactly right as the 1e-9 double-rounds to 2e-9 when we=20 compute the struct timespec. Also, even with the patch the code=20 mishandles 16777216.000000001 (2**24 + 10**-9) by treating it as if it=20 were just 16777216. These are tiny bugs, I know, but I took up the=20 challenge of doing this things more correctly by installing the attached. --------------H2q1gelg9asgz40i29t5buIH Content-Type: text/x-patch; charset=UTF-8; name="0001-timeout-round-timeouts-up.patch" Content-Disposition: attachment; filename="0001-timeout-round-timeouts-up.patch" Content-Transfer-Encoding: base64 RnJvbSBhM2I4NjJlY2UyYWEwNGQ1YzBiNWU5M2ZlYzhlNjZlNDViOWIzNTYwIE1vbiBTZXAg MTcgMDA6MDA6MDAgMjAwMQpGcm9tOiBQYXVsIEVnZ2VydCA8ZWdnZXJ0QGNzLnVjbGEuZWR1 PgpEYXRlOiBTYXQsIDUgQXByIDIwMjUgMDA6NTg6MjIgLTA3MDAKU3ViamVjdDogW1BBVENI XSB0aW1lb3V0OiByb3VuZCB0aW1lb3V0cyB1cApNSU1FLVZlcnNpb246IDEuMApDb250ZW50 LVR5cGU6IHRleHQvcGxhaW47IGNoYXJzZXQ9VVRGLTgKQ29udGVudC1UcmFuc2Zlci1FbmNv ZGluZzogOGJpdAoKVGhpcyBoYW5kbGVzIHRpbWVvdXRzIGxpa2UgMTY3NzcyMTYuMDAwMDAw MDAxIGNvcnJlY3RseTsKZm9ybWVybHkgdGhlIHN1YnNlY29uZCBwYXJ0IG9mIHRoYXQgdGlt ZW91dCB3YXMgaWdub3JlZC4KKiBib290c3RyYXAuY29uZiAoZ251bGliX21vZHVsZXMpOiBB 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bug-coreutils@HIDDEN:bug#77535; Package coreutils.
Full text available.Received: (at 77535-done) by debbugs.gnu.org; 5 Apr 2025 05:40:59 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Sat Apr 05 01:40:59 2025 Received: from localhost ([127.0.0.1]:41173 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1u0wH4-0002I8-IJ for submit <at> debbugs.gnu.org; Sat, 05 Apr 2025 01:40:59 -0400 Received: from mail-il1-f182.google.com ([209.85.166.182]:48523) by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.84_2) (envelope-from <nicolas.boichat@HIDDEN>) id 1u0n7C-0003uD-77 for 77535-done <at> debbugs.gnu.org; Fri, 04 Apr 2025 15:54:10 -0400 Received: by mail-il1-f182.google.com with SMTP id e9e14a558f8ab-3d5e43e4725so7130125ab.1 for <77535-done <at> debbugs.gnu.org>; Fri, 04 Apr 2025 12:54:10 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1743796444; x=1744401244; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=NX4V2XwDxOHlg7ch2xMNiW9sEdY6gTd4uZmai9eBGec=; b=r24eEqPU/0dtcA0oMB8ACyhk9wih3FlXKoD54fh1qLQyPs8DoRCZz5F+6IuOTvL0uA AGQaGKOeiyhRIGTfwgKpy2zhXE1q1jWn6fz55hB0O+VhvgsvsSySZn3gPQ/LzDnZ/mAW 1BquNWwiDllUruAW3hnUklclDwLi3K4y9Q87MImSzgc9ngsU+rpBChPd8ZaHD+tgghGL rnCs7zvWvHWo+KVBYABYLkev72A4+5UDVFOFC6TNPwY0ZNdk6MPDosSdlQZL1HCF6UEq nW+zjDTV8na6wrMomUjPaesdnYLANX55lYukGlvKCmYfvtGI9R/X7ZH1OT68yRWQXgJz puUw== X-Gm-Message-State: AOJu0YxsE3ZTQSK1DOWfiOUsV8XWbAznb9itW4aKWJI3NwbUcLHFSxUL Moqr5xeHCv/ufgJk1paGCA2b0qeKYsQudzZExLmSOmsMOcg1D+uI35nzyOIvgmwEzYtEfljdyON nr+1iIbtZfKUP2VmpkKuymaLTkbi7+K+B X-Gm-Gg: ASbGncvJu6BU97FaMSujXn2J279y8a+S0UWw/EaT+2TX8MIVi4wYfIx6qPMjo27QY3O MvUIgSdSWFulQhMdW7q/m3lFPuaB7goOGob7z1spARVUVxwcoRxJIwpWhGzNR5tFoFVXFnSFgv6 9qRHfDIJJKdLM8HTW3WmBEPUcX X-Google-Smtp-Source: AGHT+IECWTaiFCD717PaTOJwtYkitPuzxldv6UkQ8kDrotVzw4xqBoSGqNTGBl9mThuVLYetT73hZTKufg6PBzjtfEA= X-Received: by 2002:a92:cd84:0:b0:3d4:414c:6073 with SMTP id e9e14a558f8ab-3d6ec53372dmr9186905ab.8.1743796444280; Fri, 04 Apr 2025 12:54:04 -0700 (PDT) MIME-Version: 1.0 References: <CAM6NUi5isNtqv5-UqtA4yMBTZcs1+sMLJ6uQvKn7QpE7pSS0dg@HIDDEN> <a1cfeefb-ca6d-42a5-8701-8e8c0d607b87@HIDDEN> In-Reply-To: <a1cfeefb-ca6d-42a5-8701-8e8c0d607b87@HIDDEN> From: Nicolas Boichat <nicolas@HIDDEN> Date: Fri, 4 Apr 2025 21:53:53 +0200 X-Gm-Features: ATxdqUHeL-MTT9nqiXGnchwWhM6oCzl53jQeMlBqHI_hHLAFxHSkLJ2LbpCaO0s Message-ID: <CAM6NUi5KwiB0oejknc817CvGetiY8aLAh-bauE6_L+1NcjyxhQ@HIDDEN> Subject: Re: bug#77535: timeout treats very short durations as `0` To: =?UTF-8?Q?P=C3=A1draig_Brady?= <P@HIDDEN> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 77535-done X-Mailman-Approved-At: Sat, 05 Apr 2025 01:40:57 -0400 Cc: 77535-done <at> debbugs.gnu.org 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: -1.0 (-) On Fri, 4 Apr 2025 at 21:27, P=C3=A1draig Brady <P@HIDDEN> wrote: > > 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. That was fast! Thanks! > > thanks! > P=C3=A1draig > > 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 =3D=3D 0 && errno =3D=3D ERANGE) > + duration =3D 1e-9; > + > return duration; > } >
bug-coreutils@HIDDEN:bug#77535; Package coreutils.
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Date: Fri, 4 Apr 2025 20:27:55 +0100
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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
References: <CAM6NUi5isNtqv5-UqtA4yMBTZcs1+sMLJ6uQvKn7QpE7pSS0dg@HIDDEN>
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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;
}
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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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