From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ste-pvt-msa1.bahnhof.se (ste-pvt-msa1.bahnhof.se [213.80.101.70]) by sourceware.org (Postfix) with ESMTPS id E2CB3385700E for ; Wed, 29 Jul 2020 20:03:37 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org E2CB3385700E Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=bahnhof.se Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=rabbe@bahnhof.se Received: from localhost (localhost [127.0.0.1]) by ste-pvt-msa1.bahnhof.se (Postfix) with ESMTP id D08053F6F8 for ; Wed, 29 Jul 2020 22:03:35 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at bahnhof.se X-Spam-Score: -2.723 X-Spam-Level: X-Spam-Status: No, score=-1.1 required=5.0 tests=BAYES_00, BODY_8BITS, KAM_DMARC_STATUS, KAM_NUMSUBJECT, NICE_REPLY_A, RCVD_IN_DNSWL_LOW, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 Received: from ste-pvt-msa1.bahnhof.se ([127.0.0.1]) by localhost (ste-pvt-msa1.bahnhof.se [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id gUm0X53cJeVb for ; Wed, 29 Jul 2020 22:03:34 +0200 (CEST) Received: from [10.0.0.9] (h-47-10.A165.priv.bahnhof.se [46.59.47.10]) (Authenticated sender: mb748077) by ste-pvt-msa1.bahnhof.se (Postfix) with ESMTPA id DAE743F491 for ; Wed, 29 Jul 2020 22:03:34 +0200 (CEST) Subject: Re: stty -cooked not usable since cygwin-3.1.1-1 To: cygwin@cygwin.com References: <20200113200152.5243a304d481677c61c12450@nifty.ne.jp> <12d7cb6e-b900-6780-1d1c-80ed84cc82d5@bahnhof.se> <1ea4e90c-7075-39e8-a518-40bc764a5237@bahnhof.se> <20200729013848.cf6d4d99464e92d92d346029@nifty.ne.jp> <22f2becd-1f2e-5ff8-4999-b34f2fb0bff3@bahnhof.se> From: Rabbe Fogelholm Message-ID: Date: Wed, 29 Jul 2020 22:03:34 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: cygwin@cygwin.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: General Cygwin discussions and problem reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 29 Jul 2020 20:03:42 -0000 On 2020-07-29 01:30, Thomas Wolff wrote: > > > Am 28.07.2020 um 21:51 schrieb Rabbe Fogelholm: >> On 2020-07-28 18:56, Thomas Wolff wrote: >>> >>> >>> Am 28.07.2020 um 18:38 schrieb Takashi Yano via Cygwin: >>>> On Tue, 28 Jul 2020 15:56:54 +0200 >>>> Rabbe Fogelholm wrote: >>>>> Rabbe Fogelholm wrote: >>>>>> Takashi Yano wrote: >>>>>>> On Mon, 13 Jan 2020 11:52:43 +0100 >>>>>>> Rabbe Fogelholm wrote: >>>>>>>> I am running a console Java program that is started from a >>>>>>>> shellscript >>>>>>>> wrapper. Before invoking Java the wrapper calls `stty -cooked'. >>>>>>>> The Java >>>>>>>> program polls the keyboard using System.in.available() and reads >>>>>>>> characters immediately using System.in.read(), without waiting >>>>>>>> for the >>>>>>>> Enter key to be pressed. >>>>>>>> >>>>>>>> This way of combining `stty -cooked' and Java has stopped >>>>>>>> working since >>>>>>>> version 3.1.1-1 of the Cygwin package. The Java thread that >>>>>>>> reads the >>>>>>>> keyboard hangs until Enter is pressed, which is not desirable. >>>>>>>> >>>>>>>> I had to downgrade to version 3.0.7-1 to resolve the problem. >>>>>>>> >>>>>>>> Versioning information: >>>>>>>> >>>>>>>> java version "1.8.0_202" >>>>>>>> Java(TM) SE Runtime Environment (build 1.8.0_202-b08) >>>>>>>> Java HotSpot(TM) 64-Bit Server VM (build 25.202-b08, mixed mode) >>>>>>>> >>>>>>>> OS Name: Microsoft Windows 10 Pro >>>>>>>> Version: 10.0.17763 Build 17763 >>>>>>>> System Type: x64-based PC >>>>>>>> >>>>>>>> See also the enclosed cygcheck.out. >>>>>>>> >>>>>>>> To demonstrate the issue I enclose a small Java program that >>>>>>>> should be >>>>>>>> able to read single keystrokes when `stty -cooked' is in effect. >>>>>>> Does your java program work in command prompt? cygwin 3.1.x uses >>>>>>> pseudo console, so the native (non cygwin) program works as if it >>>>>>> is executed in command prompt. >>>>>>> >>>>>> With cygwin 3.1.x I can't find a way to make my program work. >>>>>> >>>>>> When running from within a Cygwin64 terminal the `stty -cooked' >>>>>> command >>>>>> terminates with exit code 0, but the Java program behaves just as if >>>>>> `stty -cooked' is not in effect: It does not handle single keystrokes >>>>>> immediately. >>>>>> >>>>>> When running from a Windows command prompt I can execute the stty >>>>>> program as \cygwin64\bin\stty. However, when given the '-cooked' >>>>>> argument it complains: >>>>>> /usr/bin/stty: 'standard input': unable to perform all requested >>>>>> operations >>>>>> >>>>>> - and here as well the Java program behaves as if `stty -cooked' >>>>>> is not >>>>>> in effect. >>>>> Some time has passed; I am just curious if anyone may have found a >>>>> solution to the "stty -cooked" issue. With cygwin-3.0.* it was >>>>> possible >>>>> to have a Java program act on single keystrokes, with cygwin-3.1 I >>>>> don't >>>>> know how to do it. Any ideas welcome! >>>> Solution 1: >>>> Redesign your java program using JNA with kbhit()/getch() instead of >>>> System.in.available()/System.in.read(). >>>> >>>> Solution 2: >>>> Add SetConsoleMode() call with ENABLE_LINE_INPUT flag cleared using >>>> JNA. >>> Couldn't cygwin clear this flag when it sets up ConPTY while the pty >>> is in raw mode? >>> Thomas >>> >>>> >>>> Solution 3: >>>> Use a wrappwer instead of stty such as: >>>> >>>> #include >>>> #include >>>> #include >>>> #include >>>> #include >>>> #include >>>> >>>> void *fwd(void *param) >>>> { >>>>      FILE *f = (FILE *) param; >>>>      char buf[128]; >>>>      int len; >>>>      while (1) { >>>>          if ((len = read(0, buf, sizeof(buf))) <= 0) break; >>>>          if (write(fileno(f), buf, len) < len) break; >>>>      } >>>>      return NULL; >>>> } >>>> >>>> int main(int argc, char *argv[]) >>>> { >>>>      FILE *f; >>>>      int i; >>>>      pthread_t th; >>>>      struct termios t, t_orig; >>>>      char cmd[1024] = {0, }; >>>>      if (argc < 2) return 0; >>>>      for (i = 1; i < argc && strlen(cmd)+strlen(argv[i]) < >>>> sizeof(cmd)-2; i++) { >>>>          sprintf(cmd + strlen(cmd), (i>1)?" %s":"%s", argv[i]); >>>>      } >>>>      f = popen(cmd, "w"); >>>>      tcgetattr(0, &t_orig); >>>>      t = t_orig; >>>>      cfmakeraw(&t); >>>>      tcsetattr(0, TCSANOW, &t); >>>>      pthread_create(&th, NULL, fwd, f); >>>>      wait(NULL); >>>>      tcsetattr(0, TCSANOW, &t_orig); >>>>      pclose(f); >>>>      return 0; >>>> } >>>> >>> >>> >> Thanks Takashi for suggesting many ways to solve this! The C wrapper >> solution looks quite powerful. > Can you please provide a full test case, as it worked for you in cygwin > 3.0.7, i.e. the Java program and the wrapping commands, for some > experiments. > Thomas > >> >> Meanwhile it has occurred to me that bash itself can provide a >> workaround. Since I start the Java console application from a bash >> wrapper already, I have now changed it so that it does something like >> this: >> >> (while true; do read -s -r -N 1 Key; echo "$Key"; done) | java ... >> >> With these options to 'read' I get action on every keystroke, and the >> Java program gets its input as terminated length-1 lines. >> -- >> Problem reports:      https://cygwin.com/problems.html >> FAQ:                  https://cygwin.com/faq/ >> Documentation:        https://cygwin.com/docs.html >> Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple Hi Thomas, this small program can be used for experiments: --- ReadKeystrokes.java ------------ import java.io.IOException; public final class ReadKeystrokes { /** * Read keystrokes and write codes to standard output. The * intention is that writing should occur immediately. * @param args * @throws InterruptedException * @throws IOException */ public static void main(String[] args) throws IOException, InterruptedException { System.out.println("Press any keys; to exit press 'q'"); for (; true;) { if (System.in.available() > 0) { final int c = System.in.read(); System.out.println(String.format("key was pressed, code: %d", c)); if (c == 'q') { break; } } else { Thread.sleep(100); } } } } ------------------------------------ After compiling, assuming ReadKeystrokes.class is in the current directory, launch it with: java -classpath ./ ReadKeystrokes