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". -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
