From:	Hyeong-Tae Jou <htjou AT kordi DOT re DOT kr>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Serial port (RS232C) open
Date:	Thu, 17 Oct 2002 10:37:44 +0900
Organization:	Korea Research Environment Open Network
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Thanks,

In Linux, I used C-functions like
   open(), tcsetattr(), and read()
for opening, setting parameter, and reading data from
serial port.

I am trying to use the same C-code in Win2000.
Here is the suumary of run result in Win2000:

1) open COM1 - looks OK.

2) tcsetattr - looks it works.

3) read() - This doesn't work like Linux.

   In Linux,
       n=read(fd, buf, RL) waits some bytes to read, and
        return the bytes actually read.

   In Win2000 command promt using DJGPP,
       n=read(fd, buf, RL) immediately return RL
        after reading RL byte data of almost null.

How can I read the actual bytes in serial port buffer ?
Is there any functions to check the bytes in buffer of serial port.
"ioctl(fd, FIONREAD, &nbyte)" doesn't work in DOS (Win2000).

jou

Eli Zaretskii wrote:

> On Wed, 16 Oct 2002, jou wrote:
>
>
>>I want to read data from serial port (RS232C).
>>Not possible to open /dev/ttyS0 in DOS.
>>
>
> Open /dev/aux or COM1 (or COM2, as the case might be) instead.
>

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