Date: Wed, 3 Aug 2016 09:54:15 -0700 From: "Lundberg, Johannes" <johannes@brilliantservice.co.jp> To: FreeBSD Current <freebsd-current@freebsd.org> Subject: Socket sendmsg() porting question Message-ID: <CAASDrVmKcO8Gi%2BROhsKpsSRTCsgx5COvGVX6MpGcS3SDG%2Bj22g@mail.gmail.com>
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Wed, 3 Aug 2016 17:12:23 +0000 (UTC) (envelope-from asomers@gmail.com) Received: from mail-oi0-x229.google.com (mail-oi0-x229.google.com [IPv6:2607:f8b0:4003:c06::229]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 1E0161C5C for <freebsd-current@freebsd.org>; Wed, 3 Aug 2016 17:12:23 +0000 (UTC) (envelope-from asomers@gmail.com) Received: by mail-oi0-x229.google.com with SMTP id l65so289231870oib.1 for <freebsd-current@freebsd.org>; Wed, 03 Aug 2016 10:12:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc; bh=KT13Eor/+WJc7SZP+nZXfczOdnGbXRbbCisR5kPbtH4=; b=gK8Lqt7s+BH0HY0/R2oGf5ynsqCCPWTcKUNP7Fg9tCGqN++InT51UBHFV2GuUOmdj6 W1aF+tkK/51EbC5zMSfxNVKl0ajEO1gnB8oExBdCvF58rI5oSXtwcOPqe+Ri92K0RpGG Z7X8EZK2nflW/tY45lVaMf2a9n84hSjLyh5PUJd+fQGUMr6U2LhD0Dt75AS2vW4RXML9 lqcNc1pRpL4ZL7ry+J5EQ9sWJypw4wXG1fULIhoDsaAWF8WQTA5p36uqE9swyWils4MH 7kR2l7/j+F2W7A+83y+5K2VcQri021JYkcxvSJ+gXwQpeeSV368CpfQoJFumaivcU6vK v5+g== X-Google-DKIM-Signature: v=1; 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charset=UTF-8 X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Discussions about the use of FreeBSD-current <freebsd-current.freebsd.org> List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-current>, <mailto:freebsd-current-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current/>; List-Post: <mailto:freebsd-current@freebsd.org> List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help> List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-current>, <mailto:freebsd-current-request@freebsd.org?subject=subscribe> X-List-Received-Date: Wed, 03 Aug 2016 17:12:23 -0000 On Wed, Aug 3, 2016 at 10:54 AM, Lundberg, Johannes <johannes@brilliantservice.co.jp> wrote: > Hi > > I'm porting a project to fbsd and I have problem with this part that works > in linux but not fbsd when fd = -1. > > https://github.com/Cloudef/wlc/blob/master/src/session/fd.c#L80-L108 > > I get "invalid argument" from sendmsg() when setting CMSG_LEN(0). > > Anyone have a clue how to correctly do this on fbsd? > > Thanks! > > Johannes > It sounds like you're trying to send an empty cmsg. The error may happen because your msg_controllen field is inconsistent with your cmsg_len field. You're setting msg_controllen as if there were a full cmsg, but then cmsg_len says that there is no cmsg. Or maybe the error is because (just guessing) FreeBSD doesn't allow sending empty or undefined cmsgs. Notice that cmsg_level and cmsg_type are undefined in the case where fd == -1. POSIX doesn't say whether sendmsg supports empty cmsgs, but why bother? You could just use send instead of sendmsg if you're not sending a file descriptor. -Alan
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