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Date: Tue, 15 Oct 2002 23:11:09 -0400
To: cygwin AT cygwin DOT com
From: "Pierre A. Humblet" <Pierre DOT Humblet AT ieee DOT org>
Subject: Re: window problem with cygwin-3-13?
In-Reply-To: <20021015175850.GB11619@redhat.com>
References: <20021015091816 DOT GA784 AT ingber DOT com>
 <20021015091816 DOT GA784 AT ingber DOT com>
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At 01:58 PM 10/15/2002 -0400, Christopher Faylor wrote:
>On Tue, Oct 15, 2002 at 05:18:16AM -0400, Lester Ingber wrote:
>>Under cygwin-3-13, ispell does not respond to keystrokes 
>>The window seems to freeze.  Under 3-12, it works as expected.
>
>so this will probably require more debugging on your part.

The program below demonstrates the issue. After the second ioctl, 
getchar() becomes non-blocking and returns -1 even though it should
(? I am not an expert on termio ...) wait for a character because of
    sbuf.c_cc[VMIN] = 1;
It works as expected with 3-12. This is on WinME.

Incidentally what's happening is that ispell is generating infinitely 
many "bells" while getting getchar() == -1. They can be heard on the
console. Under rxvt this eventually causes fflush(stdout) to freeze.

Pierre

#include <termio.h>
#include <stdio.h>

main ()
{
    struct termio sbuf;
    int c, n;

    ioctl (0, TCGETA, (char *) &sbuf);

    fprintf(stdout,"getchar\n");
    while ((c = getchar()) != '\n') printf("%d ", c);
    fprintf(stdout, "\n");

    sbuf.c_lflag &= ~ICANON;
    sbuf.c_cc[VMIN] = 1;
    sbuf.c_cc[VTIME] = 1;
    ioctl (0, TCSETAW, (char *) &sbuf);

    n = 0;
    fprintf(stdout,"getchar\n");
    while (((n++ < 20) && (c = getchar()) != '\n')) printf("%d ", c);
    fprintf(stdout, "\n");

    sbuf.c_lflag |= ICANON;
    ioctl (0, TCSETAW, (char *) &sbuf);
}


  

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