From nobody Sun May 23 18:18:07 2021 X-Original-To: bugs@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id DAAD79F4E4F for ; Sun, 23 May 2021 18:18:07 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Fp7qz5c2Dz4vrX for ; Sun, 23 May 2021 18:18:07 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id A4E351BD37 for ; Sun, 23 May 2021 18:18:07 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 14NII7ih052981 for ; Sun, 23 May 2021 18:18:07 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 14NII7TW052980 for bugs@FreeBSD.org; Sun, 23 May 2021 18:18:07 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 256105] dlerror(3) returns an empty string Date: Sun, 23 May 2021 18:18:07 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: misc X-Bugzilla-Version: 13.0-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: yuri@freebsd.org X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter attachments.mimetype attachments.created Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: Bug reports List-Archive: https://lists.freebsd.org/archives/freebsd-bugs List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-bugs@freebsd.org MIME-Version: 1.0 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D256105 Bug ID: 256105 Summary: dlerror(3) returns an empty string Product: Base System Version: 13.0-RELEASE Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: misc Assignee: bugs@FreeBSD.org Reporter: yuri@freebsd.org Attachment #225202 text/plain mime type: Created attachment 225202 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D225202&action= =3Dedit dlerror-return.c The attached program prints this: > after dlopen of '/usr/lib/libutil.so' dlerror: p=3D0x800222760 s=3D'' s[0= ]=3D0 dlerror(3) returns an empty, zero-terminated string. The manpage says that it returns null pointer when no error has occurred: > The dlerror() function returns a null-terminated character string > describing the last error that occurred during a call to dlopen(), > dladdr(), dlinfo(), dlsym(), dlvsym(), dlfunc(), or dlclose(). If no > such error has occurred, dlerror() returns a null pointer. At each = call > to dlerror(), the error indication is reset. Thus in the case of two > calls to dlerror(), where the second call follows the first immediat= ely, > the second call will always return a null pointer. Was the behavior changes? I found this problem while investigating why the Jack audio server (audio/j= ack) now fails to start with: > could not find any drivers in /usr/local/lib/jack! This is because its test for errors fails because of the above. --=20 You are receiving this mail because: You are the assignee for the bug.=