Question

information about a process?

Asked by: joele23

I start a fork a new process in my program with execl and I get this process id. Is there a way for me to check and see later in my original program if this process is still running and to get the user id of this process.

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Asked On
2003-02-25 at 12:35:06ID20529366
Tags

process

,

program

,

get

,

information

Topic

C Programming Language

Participating Experts
2
Points
150
Comments
13

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Answers

 

by: joele23Posted on 2003-02-25 at 14:28:20ID: 8020734

hmm..must be tougher than I thought

 

by: anovickisPosted on 2003-02-25 at 14:30:46ID: 8020765

The answer depends on the system you run it on - perhaps you should elucidate.

 

by: mnashadkaPosted on 2003-02-25 at 15:34:32ID: 8021242

On UNIX/Linux you can use waitpid with the WNOHANG parameter (so that you don't block until it does exit).

 

by: joele23Posted on 2003-02-25 at 16:22:52ID: 8021600

mnashadka

I dont quite get it. How will this tell me if the process is still running and the user id of this process?

 

by: mnashadkaPosted on 2003-02-25 at 16:49:25ID: 8021761

If waitpid returns the process id, that means that there's a status.  There's also a WIFEXITED macro on some systems that will help you tell if the process exited.
Alternatively, each system has it's own calls.  For instance, on Linux you could check to see if there's a directory named /proc/<process id> using access().

 

by: joele23Posted on 2003-02-26 at 09:18:01ID: 8026878

this still doenst tell me the user id though. I would think there had to pe a better way.

 

by: joele23Posted on 2003-02-26 at 11:03:46ID: 8027650

hmm..still no complete answer so pints going up

 

by: joele23Posted on 2003-02-26 at 11:04:48ID: 8027655

my typing skills suck sorry for typos

 

by: mnashadkaPosted on 2003-02-26 at 12:03:34ID: 8028092

getuid will get the int user id for the calling process.  Unless the process explicitly calls setuid, the child will have the same user id.

 

by: joele23Posted on 2003-02-26 at 12:53:32ID: 8028424

Ok,
but how do I know for sure that when I call waitpid that the process hasnt exited and a different process is running with the same pid. Is there a way to extract the process anme form this too?

 

by: joele23Posted on 2003-02-26 at 12:54:04ID: 8028430

by the way Im going to give you the pints I just want to make sure this all works

 

by: mnashadkaPosted on 2003-02-26 at 12:58:28ID: 8028457

waitpid will only work with child processes of the current process.

 

by: joele23Posted on 2003-02-26 at 14:28:12ID: 8029053

I still think thers a better way but this will  have to work.

20120131-EE-VQP-002

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