>> When I run tshark or windump in a cmd.exe window (e.g. "tshark -i1 >> -n") I see immediate output of network traffic seen by my network >> interface and continues to stream live network traffic information. >> >> When I run either program in Cygwin Terminal, there is about a 20 >> second delay before I see any output. At which time it immediately >> dumps the previous 20 seconds of "queued up" output and hangs again >> for 15-20 seconds, followed by another dump of "queued up" output, >> etc... >> >> Is there some way I can have Cygwin Terminal stream the data like cmd.exe >> does? > > From the point of view of these programs, mintty is a pipe. When a > program thinks it's writing to a display (a tty), it typically flushes > the output after every line. But when a program thinks the user won't > see its output, a program typically flushes its buffers less often > because writing in larger chunks is more efficient. You need to > convince these non-Cygwin programs to not buffer their output. Have > you tried the conin utility? > > https://code.google.com/p/mintty/source/browse/utils/conin.c >
In case anyone is searching this in the future, windump and tshark both have a command line switch of "-l" that flushes standard output after each packet. Using this resolves the issue. -- 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
