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Re: capturing stdout/err/in of subprocess [message #1701 is a reply to message #1699]

Tue, 14 March 2006 10:43

gprentice is currently offline

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

Experienced Member

wilho wrote on Tue, 14 March 2006 20:53

I suppose that miriek foresaw my intention not to create real terminal emulator but cmd.exe -wrapper.

If I redirect streams between myprocess/cmd-subprocess, is there a flow-control-alike mechanism - meaning do my input get lost if subprocess is not able to read it immediately?

As far as I can tell, the mechanism by which characters appear in the input stream (e.g. cin or stdin) is compiler, application and OS dependent but there's usually at least a small buffer either in the OS or the application or both (see setbuf()). I do not know whether an application asks the OS for a single character at a time or a "line" at a time or whether it's an event loop style "push" operation as in Win32 GUI apps, however there's no flow control provided by C/C++ runtime or the operating system, so an application that needs to have character input suspended or slowed at any time has to provide it's own flow control.

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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