From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mailfilter03.viettel.com.vn (mailfilter03.viettel.com.vn [125.235.240.55]) by dpdk.org (Postfix) with ESMTP id C44822C57 for ; Tue, 23 Jan 2018 03:03:52 +0100 (CET) X-IronPort-AV: E=Sophos;i="5.46,398,1511802000"; d="scan'208";a="73402693" Received: from 125.235.240.45.adsl.viettel.vn (HELO mta2.viettel.com.vn) ([125.235.240.45]) by mailfilter03.viettel.com.vn with ESMTP; 23 Jan 2018 09:03:40 +0700 Received: from localhost (localhost [127.0.0.1]) by mta2.viettel.com.vn (Postfix) with ESMTP id E1E7169B705 for ; Tue, 23 Jan 2018 09:03:18 +0700 (ICT) Received: from mta2.viettel.com.vn ([127.0.0.1]) by localhost (mta2.viettel.com.vn [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id reVosNtc-UJc for ; Tue, 23 Jan 2018 09:03:18 +0700 (ICT) Received: from localhost (localhost [127.0.0.1]) by mta2.viettel.com.vn (Postfix) with ESMTP id B499069B70D for ; Tue, 23 Jan 2018 09:03:18 +0700 (ICT) X-Virus-Scanned: amavisd-new at Received: from mta2.viettel.com.vn ([127.0.0.1]) by localhost (mta2.viettel.com.vn [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id 3sm_3_CNW2fh for ; Tue, 23 Jan 2018 09:03:18 +0700 (ICT) Received: from ANMLONGTB5 (unknown [27.68.241.28]) by mta2.viettel.com.vn (Postfix) with ESMTPSA id 8678369B706 for ; Tue, 23 Jan 2018 09:03:18 +0700 (ICT) To: References: <001501d3936a$5ad21450$10763cf0$@viettel.com.vn> <20180122133815.qdfhjufewirzwb2r@platinum> In-Reply-To: <20180122133815.qdfhjufewirzwb2r@platinum> Message-ID: <000101d393ee$c8441180$58cc3480$@viettel.com.vn> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQJpaCGnHyPDTPUlyA8C5lifNIPb4gGNCH9NokiSOTA= Content-Language: en-us MilterAction: FORWARD Date: Tue, 23 Jan 2018 09:03:18 +0700 (ICT) From: longtb5@viettel.com.vn Subject: Re: [dpdk-users] librte_cmdline usage X-BeenThere: users@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK usage discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 23 Jan 2018 02:03:53 -0000 Hi Oliver, Yes that was exactly what I needed. Thanks. --BL > -----Original Message----- > From: olivier.matz@6wind.com [mailto:olivier.matz@6wind.com] > Sent: Monday, January 22, 2018 8:38 PM > To: longtb5@viettel.com.vn > Cc: users@dpdk.org > Subject: Re: librte_cmdline usage > > Hi, > > On Mon, Jan 22, 2018 at 05:15:22PM +0700, longtb5@viettel.com.vn wrote: > > Hi all, > > > > I'm writing an application where there already exists a cmdline. Users > > can issue commands by typing from stdin. I want to support another > > user interface where commands are read from sources other than stdin, > > saved into a string buffer, then executed using the already existed > cmd_parse_ctx_t. > > > > So far I have implemented this functionality using the > > cmdline_interact() API like so (pseudo code). > > > > /* Initialization */ > > /* cmds_ctx is the existing command context > > * that I wish to reuse > > */ > > new_cl = cmdline_new(cmds_ctx, "", cmdbuf_fd, 1); > > > > /* Polling */ > > for ( ; ; ) { > > snprintf(cmdbuf, cmdlen + 2, "%s\n", raw_string); > > lseek(cmdbuf_fd, 0 , SEEK_SET); > > cmdline_interact(new_cl); > > } > > > > There are a couple of questions: > > > > 1. Using cmdline_interact() seems to be quite expensive. How can I > > reduce this cost. Is there a leaner/more elegant way to implement this > > using DPDK API or do I have to write my own code/change the lib? > > > > 2. How can I disable the behavior where every interaction is written > > to stdout, i.e., to have no output what so ever. Again this is to > > improve performance since writing to stdout is costly. > > If my understanding is correct, you want to use the command line parser > without the i/o (readline part). For this, you can directly call cmdline_parse(cl, > buffer). It will parse the given buffer and invokes the callback. > > There will be no output on stdout done by the cmdline library. But it does not > prevent a command callback to call printf() or similar. > > Olivier