From patchwork Mon Dec 2 20:32:10 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: DJ Delorie X-Patchwork-Id: 36443 Received: (qmail 81400 invoked by alias); 2 Dec 2019 20:32:17 -0000 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: , Sender: libc-alpha-owner@sourceware.org Delivered-To: mailing list libc-alpha@sourceware.org Received: (qmail 81388 invoked by uid 89); 2 Dec 2019 20:32:17 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-18.2 required=5.0 tests=AWL, BAYES_00, GIT_PATCH_0, GIT_PATCH_1, GIT_PATCH_2, GIT_PATCH_3 autolearn=ham version=3.3.1 spammy= X-HELO: us-smtp-delivery-1.mimecast.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1575318734; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=vUrGE/y2GAVUMdC3HFrIyK0p1d4PcznkA8dtEjUo1Dc=; b=WCHTO2I07hhKHYPaw3EXENmAYkrsy/13g5D8khpGZOMW33D1zmEefrPjDqtbu+0gOVFzsD pxV/IelCXwFbp+PvHTc5OQYfz7Dgs1Rdsqz6H5W1sFcUTdWmJSfm3Af2vH2l8ftHYYUoWw 9R9xOlMKAHOO03L7olKGNlxqWYqrrZc= Date: Mon, 02 Dec 2019 15:32:10 -0500 Message-Id: From: DJ Delorie To: mtk.manpages@gmail.com CC: linux-man@vger.kernel.org, libc-alpha@sourceware.org Subject: [patch] ldconfig.8: Document file filter and symlink pattern expectations X-Mimecast-Spam-Score: 0 Information gleaned from comments in glibc's elf/ldconfig.c diff --git a/man8/ldconfig.8 b/man8/ldconfig.8 index 4f799962c..15585243c 100644 --- a/man8/ldconfig.8 +++ b/man8/ldconfig.8 @@ -93,6 +93,28 @@ option. .B ldconfig should normally be run by the superuser as it may require write permission on some root owned directories and files. +.PP +Note that +.B ldconfig +will only look at files that are named +.I lib*.so* +(for regular shared objects) or +.I ld-*.so* +(for the dynamic loader itsef). Other files will be ignored. Also, +.B ldconfig +expects a certain pattern to how the symlinks are set up, like this +example, where the middle file +.RB ( libfoo.so.1 +here) is the SONAME for the library: +.PP +.in +4n +.EX +libfoo.so -> libfoo.so.1 -> libfoo.so.1.12 +.EE +.in +.PP +Failure to follow this pattern may result in compatibility issues +after an upgrade. .SH OPTIONS .TP .BR \-c " \fIfmt\fP, " \-\-format=\fIfmt\fP