{"id":811196,"url":"http://patchwork.ozlabs.org/api/patches/811196/?format=json","web_url":"http://patchwork.ozlabs.org/project/glibc/patch/20170907224219.12483-3-albert.aribaud@3adev.fr/","project":{"id":41,"url":"http://patchwork.ozlabs.org/api/projects/41/?format=json","name":"GNU C Library","link_name":"glibc","list_id":"libc-alpha.sourceware.org","list_email":"libc-alpha@sourceware.org","web_url":"","scm_url":"","webscm_url":"","list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20170907224219.12483-3-albert.aribaud@3adev.fr>","list_archive_url":null,"date":"2017-09-07T22:41:29","name":"[RFC,02/52] Y2038: add function __difftime64","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"eb732ac61fcd2f8dc306ba40f918e1e7c4eba34b","submitter":{"id":65557,"url":"http://patchwork.ozlabs.org/api/people/65557/?format=json","name":"Albert ARIBAUD (3ADEV)","email":"albert.aribaud@3adev.fr"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/glibc/patch/20170907224219.12483-3-albert.aribaud@3adev.fr/mbox/","series":[{"id":2074,"url":"http://patchwork.ozlabs.org/api/series/2074/?format=json","web_url":"http://patchwork.ozlabs.org/project/glibc/list/?series=2074","date":"2017-09-07T22:41:27","name":"Make GLIBC Y2038-proof","version":1,"mbox":"http://patchwork.ozlabs.org/series/2074/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/811196/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/811196/checks/","tags":{},"related":[],"headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":["patchwork-incoming@bilbo.ozlabs.org","mailing list libc-alpha@sourceware.org"],"Authentication-Results":["ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=sourceware.org\n\t(client-ip=209.132.180.131; helo=sourceware.org;\n\tenvelope-from=libc-alpha-return-84320-incoming=patchwork.ozlabs.org@sourceware.org;\n\treceiver=)","ozlabs.org; dkim=pass (1024-bit key;\n\tsecure) header.d=sourceware.org header.i=@sourceware.org\n\theader.b=\"fngUaLFt\"; dkim-atps=neutral","sourceware.org; auth=none"],"Received":["from sourceware.org (server1.sourceware.org [209.132.180.131])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256\n\tbits)) (No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xpFpV5LXxz9sCZ\n\tfor ;\n\tFri, 8 Sep 2017 08:42:58 +1000 (AEST)","(qmail 57622 invoked by alias); 7 Sep 2017 22:42:38 -0000","(qmail 57523 invoked by uid 89); 7 Sep 2017 22:42:38 -0000"],"DomainKey-Signature":"a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id\n\t:list-unsubscribe:list-subscribe:list-archive:list-post\n\t:list-help:sender:from:to:cc:subject:date:message-id:in-reply-to\n\t:references; q=dns; s=default; b=aIDUZVNLw0G/DjR8YGqOBVjzuwR0h3a\n\td2tCMxBVYWWrpp6nQIOOCxXGPuYE9bvuICaFePmdQJsWXn8EXpSCwtWZADSAYTyl\n\tlAlLJSZiAf1HZUWqWcfzBeLSJ66fqxvbNK9OpEjYPNq7mN29wNa97E9EhcyFDvpo\n\tsRuTPSA/lucs=","DKIM-Signature":"v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id\n\t:list-unsubscribe:list-subscribe:list-archive:list-post\n\t:list-help:sender:from:to:cc:subject:date:message-id:in-reply-to\n\t:references; s=default; bh=jjlwUHSLg1yQPLPxhcJ0dWBSirg=; b=fngUa\n\tLFt6SQ6dFuzEYF7PTGnOzV4v/UhiDhdH+PrBuqZJTHAFVbkuFTPr/wPRla+qjRdZ\n\tJ2/s1I25Cpfk6lcwSMZQRpLLdiedbhntx9c+4XIbBNloShCnjBDQerh1Wc9Lagjq\n\trqqO/7rZZ+MxCyQsoaS0nutfrbAA/AwyiGATSE=","Mailing-List":"contact libc-alpha-help@sourceware.org; run by ezmlm","Precedence":"bulk","List-Id":"","List-Unsubscribe":"","List-Subscribe":"","List-Archive":"","List-Post":"","List-Help":",\n\t","Sender":"libc-alpha-owner@sourceware.org","X-Virus-Found":"No","X-Spam-SWARE-Status":"No, score=-26.6 required=5.0 tests=BAYES_00, GIT_PATCH_0,\n\tGIT_PATCH_1, GIT_PATCH_2, GIT_PATCH_3,\n\tKAM_LAZY_DOMAIN_SECURITY,\n\tRCVD_IN_DNSWL_LOW autolearn=ham version=3.3.2 spammy=","X-HELO":"smtp6-g21.free.fr","From":"\"Albert ARIBAUD (3ADEV)\" ","To":"libc-alpha@sourceware.org","Cc":"\"Albert ARIBAUD (3ADEV)\" ","Subject":"[RFC PATCH 02/52] Y2038: add function __difftime64","Date":"Fri, 8 Sep 2017 00:41:29 +0200","Message-Id":"<20170907224219.12483-3-albert.aribaud@3adev.fr>","In-Reply-To":"<20170907224219.12483-2-albert.aribaud@3adev.fr>","References":"<20170907224219.12483-1-albert.aribaud@3adev.fr>\n\t<20170907224219.12483-2-albert.aribaud@3adev.fr>"},"content":"Note: the implementation expects __time64_t arguments but returns\na double like its 32-bit-time counterpart, in order to remain as\nsource-code-compatible as possible, even though the precision of a\ndouble is only about 55 bits.\n\nThe implementation is simpler than its 32-bit counterpart, as it\nassumes that all __time64_t implementations are just 64-bit integers.\n\nAlso, the implementation does not require a Y2038-proof kernel.\n\nSigned-off-by: Albert ARIBAUD (3ADEV) \n---\n sysdeps/unix/sysv/linux/arm/Versions | 7 +++++++\n time/difftime.c | 9 +++++++++\n 2 files changed, 16 insertions(+)","diff":"diff --git a/sysdeps/unix/sysv/linux/arm/Versions b/sysdeps/unix/sysv/linux/arm/Versions\nindex 7e5ba53455..d3655768c8 100644\n--- a/sysdeps/unix/sysv/linux/arm/Versions\n+++ b/sysdeps/unix/sysv/linux/arm/Versions\n@@ -16,4 +16,11 @@ libc {\n # nptl/pthread_cond_timedwait.c uses INTERNAL_VSYSCALL(clock_gettime).\n __vdso_clock_gettime;\n }\n+\n+ # Y2038 symbols are given their own version until they can be put in\n+ # the right place\n+\n+ GLIBC_Y2038 {\n+ __difftime64;\n+ }\n }\ndiff --git a/time/difftime.c b/time/difftime.c\nindex e5e3311744..1b2494c727 100644\n--- a/time/difftime.c\n+++ b/time/difftime.c\n@@ -119,3 +119,12 @@ __difftime (time_t time1, time_t time0)\n return time1 < time0 ? - subtract (time0, time1) : subtract (time1, time0);\n }\n strong_alias (__difftime, difftime)\n+\n+/* Return the difference between 64-bit TIME1 and TIME0. */\n+double\n+__difftime64 (__time64_t time1, __time64_t time0)\n+{\n+ /* Subtract the smaller integer from the larger, convert the difference to\n+ double, and then negate if needed. */\n+ return time1 < time0 ? - (time0 - time1) : (time1 - time0);\n+}\n","prefixes":["RFC","02/52"]}