check if TCP Port is open

[cspm2003]

Hi,

I have a problem: I have a script that needs to check if a tcp port is used. if its not used it shall start a program, if the port is used it should do nothing.

The tcp port I want to check is 5555.

I read something about winsock but didnt really get anywhere :S.

I could do it by using the netstat ´command and put the output in a file but thats taking to long as it needs to be done under 300ms (milisecounds).

help is greatly appreciated.

Regards Max

 

[PHV]

it needs to be done under 300ms
I'm afraid scripting is not well suited for that.

 

[cspm2003]

it has to be done with a script. the script is a generic cluster script, it implements the isAlive and looksAlive function. those check if the program is still running, looksAlive can not take longer then 300ms. I could probably just set looksAlive to TRUE and put the code in the isAlive function, that way it could take longer.

the netstat implementation i tryed took about 20 - 30 secounds, so I gues anything faster then that would be great