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Re: tcgetattr problem
On Thu, Sep 28, 2006 at 12:10:18AM +0100, ahnkle wrote:
>On 18:36 Wed 27 Sep , Igor Peshansky wrote:
>>
>> #define PORT "com1"
>> ...
>> fd = open(PORT, O_RDWR | O_NOCTTY );
>>
>> There's your problem. When you open a port as "com1", it looks like a
>> file to Cygwin, since it doesn't recognize it as a valid device name.
>> Thus any attempt to manipulate that fd as a device will fail.
>>
>> Use the Cygwin device (e.g., "/dev/ttyS0").
>
>Strangely, com1 *does* work in the call to open. Having tried "/dev/ttyS0",
>tcgetattr() works ok.
"It looks like a file to Cygwin"
>I also note that read() and write() work ok too using "com1", but
>tcsetattr() also fails.
"It looks like a file to Cygwin"
>BTW, I obtained the CVS source, but couldn't find the _ioctl() call
>anywhere in my (brief) grepping. Is there any documentation about internal
>structure, and whats going on under the hood?
The name of the function is "ioctl", not "ioctl".
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