From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9EB78C433B4 for ; Mon, 10 May 2021 17:56:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 76854611AB for ; Mon, 10 May 2021 17:56:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233277AbhEJR56 (ORCPT ); Mon, 10 May 2021 13:57:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54462 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232654AbhEJR56 (ORCPT ); Mon, 10 May 2021 13:57:58 -0400 Received: from mail-wr1-x433.google.com (mail-wr1-x433.google.com [IPv6:2a00:1450:4864:20::433]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9BB80C061574 for ; Mon, 10 May 2021 10:56:52 -0700 (PDT) Received: by mail-wr1-x433.google.com with SMTP id x5so17513914wrv.13 for ; Mon, 10 May 2021 10:56:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=dmqohYzMvS72z6Y99XXcG7umHP0lMiI/AKNyIBd/i9M=; b=owsCoNrKi1HtNnn1NWQ8d06LpNKSlDZzNDEn+9/gDIDNluwixm2rhD6nvkv+7h51VU kz94J5Xlse+jCCd8WJ7iohQWnGhUVTK1KYtxNimklrBvrwg/hK+cLbcf6OyYrWtV0Bcq vYLxy2G8fk60LVakaLLw36CQgXxhbXK4e94rQRbCMaxHgOjwG9ovIHODleCVDRQ8nbvG HXqzZzrqyRGXy8m8VxanW8bfaKfeA1n3E0wtkHkadWHc6izdJU4iDJKQgw0ol6KgRMRb a67bQ3SWfU99pzBfFxkDitYs4A4+p8eDDnLemjBHX+bgSIz9fHO1NZcDd5JTfKkekzd3 x3uA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=dmqohYzMvS72z6Y99XXcG7umHP0lMiI/AKNyIBd/i9M=; b=n57gFlYrVOKcYOgBnh8RJJjFSTT1230I+YMRR+XzMSk6hlM3n51XVnEGEJz1qmG6Q0 4hH7kFQOSWyRrywdpkQrfQHazvgOvchUftFgMi1UFvFcBpO6Adiqd1CaITc7qtaQ4+96 owKXXqzAdWXZ4UMjK5wCM0oXI9Te21+Zb7rZBSgKlvcMMZvTKU2yO7rmZIAHZZ1fAamb 3MLp1QmylIKyAHybibw1ZC9UDX80NqWfsS+Jw3Ozk7DuAGGvYMz9dH7Q1ZZvmzTSawAp vZgQVi5YOwh/Y+BAsbSFfRqwgt+thJ8+jYIAosPdkEroLau01qspDPJpI/4lqE4mnbGM oJeQ== X-Gm-Message-State: AOAM533iH5WfvXEsO2Z+3d/OVWwh0D4pDD+bGeEndL1Rb1urhwjmg1Sy TOaJUTBVmrSP82R9DsdWchk= X-Google-Smtp-Source: ABdhPJzmJXhuQ2+bC7lZLyzLU+ekt4IebYMEfohKC1ZLMkkRT40T28NewhprM8X6kS9BYskuVqEfVw== X-Received: by 2002:adf:f1d2:: with SMTP id z18mr32446793wro.245.1620669411379; Mon, 10 May 2021 10:56:51 -0700 (PDT) Received: from sqli.sqli.com ([195.53.121.100]) by smtp.googlemail.com with ESMTPSA id m13sm24318830wrw.86.2021.05.10.10.56.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 May 2021 10:56:51 -0700 (PDT) From: Alejandro Colomar To: mtk.manpages@gmail.com Cc: Florian Weimer , Jakub Wilk , Alejandro Colomar , linux-man@vger.kernel.org, libc-alpha@sourceware.org Subject: [PATCH 23/39] modify_ldt.2: Use syscall(SYS_...); for system calls without a wrapper Date: Mon, 10 May 2021 19:55:32 +0200 Message-Id: <20210510175546.28445-24-alx.manpages@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210510175546.28445-1-alx.manpages@gmail.com> References: <20210510175546.28445-1-alx.manpages@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-man@vger.kernel.org Signed-off-by: Alejandro Colomar --- man2/modify_ldt.2 | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/man2/modify_ldt.2 b/man2/modify_ldt.2 index 8ce9ed252..b67a67690 100644 --- a/man2/modify_ldt.2 +++ b/man2/modify_ldt.2 @@ -27,11 +27,19 @@ modify_ldt \- get or set a per-process LDT entry .SH SYNOPSIS .nf -.BI "int modify_ldt(int " func ", void *" ptr ", unsigned long " bytecount ); +.BR "#include " " /* Definition of " "struct user_desc" " */" +.BR "#include " " /* Definition of " SYS_* " constants */" +.B #include +.PP +.BI "int syscall(SYS_modify_ldt, int " func ", void *" ptr , +.BI " unsigned long " bytecount ); .fi .PP .IR Note : -There is no glibc wrapper for this system call; see NOTES. +glibc provides no wrapper for +.BR modify_ldt (), +necessitating the use of +.BR syscall (2). .SH DESCRIPTION .BR modify_ldt () reads or writes the local descriptor table (LDT) for a process. @@ -168,9 +176,6 @@ is neither 0, 1, 2, nor 0x11. This call is Linux-specific and should not be used in programs intended to be portable. .SH NOTES -Glibc does not provide a wrapper for this system call; call it using -.BR syscall (2). -.PP .BR modify_ldt () should not be used for thread-local storage, as it slows down context switches and only supports a limited number of threads. -- 2.31.1