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. I also note that read() and write() work ok too using "com1", but tcsetattr() also fails. 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? regards, ahnkle -- 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/
