Running external program from a D program [D2]

["Jérôme M. Berger"]

Jonathan M Davis wrote:
> Jesse Phillips wrote:
>> As you may have noticed by the comments to on bug 3158. exec()[1] calls
>> replace your process, this means it will not continue your program. To
>> get arround this you find that people will first fork()[2] and exec on
>> the child process.
> 
> Ah yes. Threads are all part of the same process, so you have to fork rather 
> than create a new thread. Whoops. I should have thought of that. But I guess 
> that comes from my almost never using fork and even only using threads when 
> I have to. Of course, it would be nice if there were a function in phobos to 
> abstract that out, but there's enough work to do on phobos that that's 
> probably not at the top of the list by any means.
> 
>> In order to get your standard output you would use the dup2()[3] call.
>>
>> Please note that I do not know how any of this will related to practices
>> on Windows. And sadly this is not D specific and actually C stuff.
>>
>> 1. http://www.opengroup.org/onlinepubs/007908799/xsh/exec.html
>> 2. http://www.yolinux.com/TUTORIALS/ForkExecProcesses.html
>> 3. http://www.mkssoftware.com/docs/man3/dup2.3.asp
> 
> Well, it's good info. So, thanks. But it would be nice if that too were 
> nicely abstracted in phobos. The undocumented shell() command works, but it 
> uses the shell, so you have to worry about escaping characters. Bleh. In any 
> case, thanks for the info.
> 
	In C, you have popen which allows to start a child process and
capture either the standard input or the standard output. It is
originally a POSIX function, but AFAIK it exists also on Windows
(although it might be called _popen there).

		Jerome
-- 
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