C++ and Java System Calls

**Korn1699** · 10-22-2004

How can you use system calls like fork and exec with Java and C++?

**Thantos** · 10-22-2004

Nope know way to use it in C++ really, I'm not pulling your leg. Whatever you do don't follow the red text. It'll just tell you lies!

**bithub** · 10-22-2004

The answer is yes for C++, and no for java.

**Xipher** · 10-22-2004

for C++ I think you simply include the needed headers just like from C, but try and use the c* librarys when you can, since those have had conversions made to work better with C++. As for java, it has its own system for multithreading built in, check out its language reference for more infomation, just search for threads.

**rotis23** · 11-13-2004

You can use threads in Java but you can't fork creating a separate process. There is a System command to run external processes though.

**eccles** · 12-10-2004

from memory, to do it in java...

Code:

String command = <whatever the hell you want>;
try
{
        Process p = Runtime.getRuntime().exec( command );
        InputstreamReader converter = new InputStreamReader( p.getInputStream() );
        input = new BufferedReader( converter );
        currentLine = input.readLine();
}
catch ( Exception e )
{
         System.err.println( e );
}

note that I have also included the stuff required to communicate with the thread (ie the bufferedreader - and you can also define a writer) - but its only the first line in the try statemnet that's essential to start the new thread (assuming you want an external program as the new thread... otherwise it's a bit different).

Like our friend above has mentioned check out the java API docs - they are mostly all you need, but since the docs are kinda useless without knowing what to look for I thought I'd better post this.

hope it helps

eccles

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