On Thu, Jul 15, 2010 at 09:54:21AM +0200, Matthias Andree wrote: >Am 15.07.2010, 07:49 Uhr, schrieb Christopher Faylor: > >> On Thu, Jul 15, 2010 at 01:44:19AM +0100, Cliff Hones wrote: >>> When select() is used to test for input availability on the standard >>> cygwin console in normal (cooked) mode, it indicates input is available >>> as soon as any key is pressed. However, a call to read(0,...) >>> will (correctly) block until a terminating RETURN is entered. >>> >>> select() should only indicate input is available when a call >>> to read would *not* block - ie when a read call will immediately >>> return at least one character or an error such as EOF. >>> >>> The behaviour of the following test case illustrates this. When run >>> in a console window typing a single key causes the program to wait >>> for the whole line. When run under mintty or on Linux the >>> select() calls will continue to return no input until RETURN is >>> entered. >> >> Since, AFAIK, Windows has no way to do this, I don't see how it could be >> done easily. You could, I guess, pull characters into a buffer until a >> newline was found but that would be pretty error-prone and any use of >> select() would potentially invalidate console i/o for subprocesses. >> >> So, I don't see this changing anytime soon. > >Is there a way to detect that the application is run from a Windows >console rather than mintty? > >If so, cygwin1.dll could print a warning to the console, (something along >the lines that running the application under some X11 terminal or mintty >is advised) and return EINVAL, or abort the application, in either case if >POSIXLY_CORRECT is set in the environment, much like some GNU tools will >switch to a more POSIX compliant behaviour with that variable.
Print a warning to the console if something uses select??? Nuh uh. This behavior has been in existence for more than ten years. I think I'll opt for explaining it once every ten years instead. cgf -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
