• Philippe Sigaud (11/11) Jun 11 2010 OK, this is a real newbie question:
• Graham Fawcett (5/21) Jun 11 2010 Try giving an absolute path to 'mkdir'. I'm fairly sure that the exec*
• BCS (7/26) Jun 11 2010 That's what the 'p' in 'vp' stand for: path.
• Philippe Sigaud (21/28) Jun 12 2010 I tried the different versions and used execvp precisely because it's

Philippe Sigaud <philippe.sigaud gmail.com> writes:

OK, this is a real newbie question:

How can I use std.process?

when I do:

import std.process;

void main() {
    execvp("mkdir", ["test"]);
}

nothing happens.

What am I doing wrong?
I'm on Vista there, didn't try the equivalent under Linux.


Philippe

Graham Fawcett <fawcett uwindsor.ca> writes:

On Fri, 11 Jun 2010 19:09:04 +0000, Philippe Sigaud wrote:

 OK, this is a real newbie question:
 
 How can I use std.process?
 
 when I do:
 
 import std.process;
 
 void main() {
     execvp("mkdir", ["test"]);
 }
 
 nothing happens.
 
 What am I doing wrong?
 I'm on Vista there, didn't try the equivalent under Linux.

Try giving an absolute path to 'mkdir'. I'm fairly sure that the exec* 
family does not use the PATH environment.

Best,
Graham

BCS <none anon.com> writes:

Hello Graham,

 On Fri, 11 Jun 2010 19:09:04 +0000, Philippe Sigaud wrote:
 
 OK, this is a real newbie question:
 
 How can I use std.process?
 
 when I do:
 
 import std.process;
 
 void main() {
 execvp("mkdir", ["test"]);
 }
 nothing happens.
 
 What am I doing wrong?
 I'm on Vista there, didn't try the equivalent under Linux.

 Try giving an absolute path to 'mkdir'. I'm fairly sure that the exec*
 family does not use the PATH environment.

That's what the 'p' in 'vp' stand for: path.

OTOH I don't remember if the exec's tack on the exe name to the args so you 
might need to do:

execvp("mkdir",["mkdir","test"]);


-- 
... <IXOYE><

Philippe Sigaud <philippe.sigaud gmail.com> writes:

Graham

 Try giving an absolute path to 'mkdir'. I'm fairly sure that the exec*
 family does not use the PATH environment.


I tried the different versions and used execvp precisely because it's
supposed to provide the path. But I admit I never tried giving it an entire
path.


BCS:

 That's what the 'p' in 'vp' stand for: path.

 OTOH I don't remember if the exec's tack on the exe name to the args so you
 might need to do:

 execvp("mkdir",["mkdir","test"]);



***


Ok, I tried your suggestions and obtained some results. Right now, I can
even make dmd compile some simple file, like this:

execvp("dmd", ["dmd", "test.d"];

It doesn't do anything with just

execvp("dmd", ["test.d"]);

Now, my goal is to activate the dot executable from graphviz
( http://www.graphviz.org )

and... it works if I use

execvp("dot", ["dot",  /* arg lis */]);
 thank to you both!

strangely, it takes 22s to produce the pdf, as opposed to about 3s at the
command line...
I think initially, I stopped it before it could finish its work.


Philippe