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dmarc=none (p=none dis=none) header.from=cs.ucla.edu Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=eggert@cs.ucla.edu Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 432F8160109; Fri, 24 Jul 2020 11:47:21 -0700 (PDT) Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id Z2Gcb6yx_itc; Fri, 24 Jul 2020 11:47:20 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 4C5CD160107; Fri, 24 Jul 2020 11:47:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at zimbra.cs.ucla.edu Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id 3kXkOtyxe9bY; Fri, 24 Jul 2020 11:47:20 -0700 (PDT) Received: from [192.168.1.9] (cpe-75-82-69-226.socal.res.rr.com [75.82.69.226]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id 1826C1600FB; Fri, 24 Jul 2020 11:47:20 -0700 (PDT) Subject: Re: C-kermit fails To: Zack Weinberg , Mike , Frank da Cruz References: <10CAD3CD-0170-4182-A920-EE825EBAF6B0@rmrco.com> From: Paul Eggert Autocrypt: addr=eggert@cs.ucla.edu; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/mixed; boundary="------------A0E1E21713C4A4702E3F057C" Content-Language: en-US X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: GNU C Library Errors-To: libc-alpha-bounces@sourceware.org Sender: "Libc-alpha" This is a multi-part message in MIME format. --------------A0E1E21713C4A4702E3F057C Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit On 7/24/20 10:36 AM, Zack Weinberg wrote: > The symbol that was removed (_IO_file_flags) was never a documented > part of the stdio interface. True, though lots of programs want to know about stdio readahead and it's unfortunate that glibc and other C libraries don't provide a documented way to get it. We have a Gnulib module for discovering stdio readahead. As seen here: https://git.savannah.gnu.org/cgit/gnulib.git/tree/lib/freadahead.c#n36 Gnulib uses the guard "#if defined _IO_EOF_SEEN || defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1" to be as portable as possible to various glibc-like libraries, so I suggest the attached minimal patch to C-Kermit. --------------A0E1E21713C4A4702E3F057C Content-Type: text/x-patch; charset=UTF-8; name="c-kermit.patch" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="c-kermit.patch" --- c-kermit/ckucmd.c 2020-04-25 13:43:15.000000000 -0700 +++ c-kermit-fix/ckucmd.c 2020-07-24 11:43:43.436751064 -0700 @@ -7575,9 +7575,10 @@ /* Here we must look inside the stdin buffer - highly platform dependent */ -#ifdef _IO_file_flags /* Linux */ +#if defined _IO_EOF_SEEN || defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 + /* glibc and similar libraries */ x = (int) ((stdin->_IO_read_end) - (stdin->_IO_read_ptr)); - debug(F101,"cmdconchk _IO_file_flags","",x); + debug(F101,"cmdconchk glibc-style","",x); #else /* _IO_file_flags */ #ifdef USE_FILE_CNT /* Traditional */ #ifdef VMS --------------A0E1E21713C4A4702E3F057C--