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Old 11-16-2012, 10:05 AM   #1
Scarrez
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Shell GET PID


Hi,

I'm writing a shell script call "start.sh" and in it I have it executing a Java file in a screen.

"screen -A -m -d -S mine java -jar /servers/minecraft.jar nogui"

I'm executing this from a C++ application I'm writing using system() and I want to get the PID from the actual minecraft server and return it to the C++ application.

I know you can use "exit" in shell but how do I actually acquire the PID from the screen I'm starting??

Using "echo $$" gets the PID of the shell file but not the java file which is what I'm interested in.

Thanks
Scarrez
 
Old 11-16-2012, 10:17 AM   #2
unSpawn
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Code:
pgrep -f "java -jar /servers/minecraft.jar nogui"
 
Old 11-16-2012, 11:16 AM   #3
Scarrez
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Thanks, works like a treat, might be a long shot but I'm trying to return this to a C++ program, for instance...

Code:
int i = system("pgrep -f 'java -jar /servers/minecraft.jar nogui'");
it just returns 0 though, is there another function I can use as an alternative to system().


Thanks
 
Old 11-16-2012, 11:53 AM   #4
linosaurusroot
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popen() is like system where you want to do input or output.
 
Old 11-16-2012, 03:27 PM   #5
Scarrez
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Thanks, will check out popen()
 
  


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