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Subject:	Re: stty -cooked not usable since cygwin-3.1.1-1
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From:	Thomas Wolff <towo AT towo DOT net>
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Date:	Tue, 28 Jul 2020 18:56:06 +0200
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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 <stdio.h>
> #include <unistd.h>
> #include <termios.h>
> #include <string.h>
> #include <pthread.h>
> #include <sys/wait.h>
>
> 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;
> }
>

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