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Date: Wed, 17 Jan 2007 10:48:02 +0100
From: Stan Pinte <stan AT sauvages DOT be>
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To: cygwin AT cygwin DOT com
Subject: Problem open(...) serial port /dev/com20 and tcgetattr(...)
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Hello,

accessing serial port under cygwin, with ids above 10 is broken:

Using "/dev/com20" results in a "No such file or directory" error.

#include <unistd.h>
#include <fcntl.h>
#include <termios.h>

int main (int argument_count, char * arguments [])=20=20=20
{=20=20=20
    printf("opening com20:");
    int fd =3D open("/dev/com20", O_RDONLY | O_NONBLOCK);=20=20=20
    perror(NULL);
    struct termios options;
    int result =3D tcgetattr(fd, &options);
    perror(NULL);=20=20=20
}

The following post:
http://www.cygwin.com/ml/cygwin/1999-12/msg00323.html says I should use

"\\\\.\\com20" instead of "/dev/com20". If I do that, the call to open(...)=
 succeed,=20
but the call to tcgetattr raises a "Inappropriate ioctl for device" error.

I checked the example using "/dev/com3", and it works all right, so the
issue is limited to ports id above 9.

I already checked the following posts:
http://sourceware.org/ml/insight/2004-q4/msg00078.html, so it seems to
be a bug.

Do you have a workaround for this?

Kind regards,

Stan.


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