From owner-freebsd-users-jp@freebsd.org Wed Aug 10 00:56:58 2016 Return-Path: Delivered-To: freebsd-users-jp@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id DBDF2BB2371 for ; Wed, 10 Aug 2016 00:56:58 +0000 (UTC) (envelope-from HGC02147@nifty.com) Received: from condef006-v.nifty.com (condef006-v.nifty.com [210.131.4.243]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 8A1B21DC9 for ; Wed, 10 Aug 2016 00:56:58 +0000 (UTC) (envelope-from HGC02147@nifty.com) Received: from conuserg-11.nifty.com ([10.26.8.74])by condef006-v.nifty.com with ESMTP id u7A0j3GE003739 for ; Wed, 10 Aug 2016 09:45:03 +0900 Received: from [192.168.0.203] (ntfkok030097.fkok.nt.ngn.ppp.infoweb.ne.jp [125.1.188.97]) (authenticated) by conuserg-11.nifty.com with ESMTP id u7A0iLgm025489 for ; Wed, 10 Aug 2016 09:44:35 +0900 DKIM-Filter: OpenDKIM Filter v2.10.3 conuserg-11.nifty.com u7A0iLgm025489 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nifty.com; s=dec2015msa; t=1470789875; bh=JBphsaGk8bHJen6Ok7GKAjwm5mXLXrZ5l+cQfTsAWlY=; h=Subject:To:References:From:Date:In-Reply-To:From; b=wVuJv20lSMgB5m1iZRfrQd+2d9yF36rC4P4c8LLlJbsvMXpo17dPvICN899MncqzM ZjYQC5b650T0oulnms9drebsm4NJm2vCurRqYctq8OQbyNlpxE0F6Gfy4Ft3IR9JQ+ LqAtFxZPAQRHx9u5v9t2vsnBjNrqOOa6fpwCD4zFYne8tXVEUjPBFo2eYodweYHQDi pYLkqlTJMPKrhulQceHXxejOpPSlqq9xN21TYwPrrfEuNcffAlCzzjOmXpZdcW+hwj CFfkSwFZe8DMmhaTsXyIZKGVtlE1VG/k4wYQRoY5wFUfNpNjADerT8HDzXX+03ZcEw vbkEGcRlvAz9g== X-Nifty-SrcIP: [125.1.188.97] To: freebsd-users-jp@freebsd.org References: <20160807030939.GA24330@ns.ribbon.or.jp> From: =?UTF-8?B?5bKh6YOoIOWLneW5uA==?= Message-ID: Date: Wed, 10 Aug 2016 09:44:21 +0900 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 MIME-Version: 1.0 In-Reply-To: <20160807030939.GA24330@ns.ribbon.or.jp> Content-Type: text/plain; charset=iso-2022-jp; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit Subject: [FreeBSD-users-jp 95919] Re: =?utf-8?b?TERfUFJFTE9BRCDjgYzjgYbjgb7jgY/jgYTjgYvjgarjgYQ=?= X-BeenThere: freebsd-users-jp@freebsd.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Discussion relevant to FreeBSD communities in Japan List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Aug 2016 00:56:59 -0000 岡部です。 9.3-RELEASEではなく10.3-STABLEですが、LD_PRELOADの設定反映されますよ。 ソースの方に綴り間違え等ありませんか？ 以下、試した内容です。 > % cat random_num.c > #include > #include > #include > > int > main(int argc, char **argv) > { > srand(time(NULL)); > int i = 10; > while (i--) > printf("%d\n", rand()); > return 0; > } > > % cc -o random_num random_num.c > % ./random_num > 2016130939 > 2115726213 > 976251671 > 1086788223 > 1301263032 > 354334582 > 329183349 > 666688777 > 1616105446 > 511080472 > % cat unrandom.c > #include > > int > rand(void) > { > return 42; > } > > % cc -shared -fPIC -o unrandom.so unrandom.c > % LD_PRELOAD=./unrandom.so ./random_num > 42 > 42 > 42 > 42 > 42 > 42 > 42 > 42 > 42 > 42 > % LD_PRELOAD=./unrandom.so ldd ./random_num > ./random_num: > libc.so.7 => /lib/libc.so.7 (0x800a21000) > % ---- 岡部 勝幸 On 2016/08/07 12:09, User Ribbon wrote: > 実行時に動的ライブラリを差し替える手段として、LD_PRELOAD 環境変数 > があります。使用例としては、 > > https://siguniang.wordpress.com/2015/05/15/override-functions-with-ld_preload/ > > などがあります。 > FreeBSDでも動くと思っててストしてみたのですが動きませんでした。 > > 上記URLにあるサンプルプログラムを使い、 > > setenv LD_PRELOAD ./unrandom.so > > をしたあと、 > %ldd random_num > としても、 > random_num: > libc.so.7 => /lib/libc.so.7 (0x800a1b000) > > となり、LD_PRELOAD した結果が反映されません。 > 動作環境は > FreeBSD bsd09-64 9.3-RELEASE-p43 FreeBSD 9.3-RELEASE-p43 #0: Sat May 28 00:19:32 UTC 2016 > です。 > > 何かほかに設定しないと動かないのでしょうか。 > > ribbon