Re: [Boost-users] [process] Determine if a process is still running?

7 Sep 2010

      Hey,

it's actually extremely simple. Feel free to use the following code if it
helps you:

bool Process::isRunning(pid_t pID) {
    if (pID <= 0) {
        return false;
    }
#if defined(PLATFORM_ENVIRONMENT_WIN32)
    HANDLE handle = OpenProcess(SYNCHRONIZE, false, pID);
    if (!handle) {
        return false;
    } else {
        CloseHandle(handle);
        return true;
    }
#elif defined(PLATFORM_ENVIRONMENT_UNIX)
    if (kill(pID, 0) == -1) {
        return false;
    } else {
        return true;
    }
#endif
}

Just keep in mind that zombie pids will be reported as running.

On 7 September 2010 23:59, Allen Cronce  wrote:
...
Hi Boris,
Thanks for getting back to me. We're currently using boost::process 0.31. I
wasn't aware of 0.4, or any recent activity in boost::process. I'll keep
that in mind the next time I have boost::process questions.
As far as the create_snapshot proposal is concerned, that looks
interesting.
Unfortunately I need a solution very soon, so my guess is that I'll have to
roll my own this time.
Best,
--
Allen Cronce
On Sep 6, 2010, at 1:54 PM, Boris Schaeling wrote:
...
On Mon, 06 Sep 2010 21:09:33 +0200, Allen Cronce 
wrote:
...
[...]I can see that boost::process supports obtaining a process ID. The
question is can boost::process use this ID to determine if a given process,
which was not launched as a child, is still running?
I assume you refer to Boost.Process 0.4 which has been released recently
and is currently heavily discussed on the Boost developer's list.
There is a proposal at <
http://www.highscore.de/boost/gsoc2010/process/appendices.html> how to
create a snapshot of currently running processes. The function
create_snapshot() wasn't finished in time though to ship it with 0.4. There
were some more ideas to filter processes returned by create_snapshot() (eg.
if you are only interested in processes owned by a certain user). But I
think in general this kind of function could help you? You could then either
iterate through the processes in the snapshot or filter with the process ID
directly?
Boris
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Re: [Boost-users] [process] Determine if a process is still running?

Rok Breulj