Mail Archives: cygwin/2004/04/27/02:02:40
Jim Brain <brain <at> jbrain.com> writes:
>
> I have an application that I need to port to windows, and it uses these two
> Linux IOCTLs. Specifically, the app needs to monitor the DSR line and signal
> another process when it changes.
>
> I have migrated the rest of the app over with minimal work, but obviously
> cygwin does not support linux/serial.h. I am OK with a rewrite of this
> function (the rest is working fine), and am also OK writing it in straight
> Win32 calls, but I don't know how to relate my opened fd with a HANDLE to use
> the relevant WIN32 calls.
>
> Of course, there might be a much easier way to monitor for changes to DSR
line,
> so I am up for an alternative (It would be nice to make the code portable to
> *BSD* as well, which means losing this IOCTL), but I am lost at present. Any
> help would be appreciated.
>
> I can send the current code to anyone who needs it.
>
> Jim Brain
As a followup, I thought maybe I would use the Win32 API to open a serial port,
use cygwin_attach_handle_to_fd() and save off both handles. Then, when I need
to WaitCommEvent, I'd use the HANDLE, otherwise, use the fd.
Problem:
All the examples online use CreateFile, which I coded up, and cygwin gives me a
fd of 8, but select returns immediately and I read -1 bytes on serial. I
looked at the cygwin source, which uses NtCreateFile, but I can't find headers
or libraries for that. I am stumped. I feel like I am so close... It's rather
a bummer there is a not a cygwin_get_win32_handle(int fd), as that is what I
need.
Anyone got any ideas?
Jim
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