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Re: capturing stdout/err/in of subprocess [message #1703 is a reply to message #1702]

Tue, 14 March 2006 11:16

gprentice is currently offline

gprentice
Messages: 260
Registered: November 2005
Location: New Zealand

Experienced Member

luzr wrote on Tue, 14 March 2006 22:54

I guess you still do not understand my worries Smile

Smile

The problem is not with feeding characters down the subprocess stdin - that is simple. And subprocess will wait if stdin is empty.

The problem is with user interface implementation - it is terminal responsibility to echo user input. Try to start a long process in cmd.exe (or linux terminal) and try to hit some character keys while process is running - the characters will not appear until subprocess blocks waiting for input (e.g. getchar). (Of course, it can appear after it ends too).

The problem is that there is no method known to me how to detect this "child process is blocked as it is waiting for user input - time to display user input line".

Mirek

You're right, I don't understand Smile

Smile

(though I was trying to respond to Wilho). But however, I'm curious. I've only used Linux terminal a little but like many people, I use cmd.exe a lot and I'm struggling to see where cmd.exe performs the echoing of user input you refer to e.g. if I do CL /?, the "CL" application is fed keys and does its own echoing (if any) - cmd.exe doesn't do the echoing. I would have thought any echoing is done by the application itself, via stdout. Any way, not to worry. I don't know how to build an atomic bomb either ...

Graeme

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[Message index]

		capturing stdout/err/in of subprocess By: wilho on Mon, 13 March 2006 14:21
		Re: capturing stdout/err/in of subprocess By: mirek on Mon, 13 March 2006 14:50
		Re: capturing stdout/err/in of subprocess By: gprentice on Tue, 14 March 2006 08:31
		Re: capturing stdout/err/in of subprocess By: mirek on Tue, 14 March 2006 09:22
		Re: capturing stdout/err/in of subprocess By: wilho on Tue, 14 March 2006 08:53
		Re: capturing stdout/err/in of subprocess By: gprentice on Tue, 14 March 2006 10:43
		Re: capturing stdout/err/in of subprocess By: mirek on Tue, 14 March 2006 10:54
		Re: capturing stdout/err/in of subprocess By: gprentice on Tue, 14 March 2006 11:16
		Re: capturing stdout/err/in of subprocess By: lundman on Tue, 14 March 2006 12:00
		Re: capturing stdout/err/in of subprocess By: mirek on Tue, 14 March 2006 12:04
		Re: capturing stdout/err/in of subprocess By: gprentice on Wed, 15 March 2006 00:09
		Re: capturing stdout/err/in of subprocess By: mirek on Wed, 15 March 2006 09:59
		Re: capturing stdout/err/in of subprocess By: mr_ped on Fri, 17 March 2006 10:52
		Re: capturing stdout/err/in of subprocess By: mirek on Fri, 17 March 2006 12:08
		Re: capturing stdout/err/in of subprocess By: fudadmin on Fri, 17 March 2006 12:11
		Re: capturing stdout/err/in of subprocess By: mirek on Fri, 17 March 2006 12:23
		Re: capturing stdout/err/in of subprocess By: gprentice on Fri, 17 March 2006 23:11
		Re: capturing stdout/err/in of subprocess By: mirek on Fri, 17 March 2006 23:25
		Re: capturing stdout/err/in of subprocess By: gprentice on Fri, 17 March 2006 23:44
		Re: capturing stdout/err/in of subprocess By: lundman on Sat, 18 March 2006 01:01
		Re: capturing stdout/err/in of subprocess By: mirek on Sat, 18 March 2006 08:47
		Re: capturing stdout/err/in of subprocess By: wilho on Sat, 18 March 2006 14:33
		Re: capturing stdout/err/in of subprocess By: lundman on Sat, 18 March 2006 15:05

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