[Lazarus] RE : How to enumerate list of Linux running processes?

[ik]

On Sun, Aug 14, 2011 at 13:09, Mark Morgan Lloyd <
markMLl.lazarus at telemetry.co.uk> wrote:

> Ludo Brands wrote:
>
>> On 13.08.2011 23:11, Frank Church wrote:
>>>
>>>> Is there a Lazarus/FPC routine to list the processes running on a Linux
>>>> system, the equivalent of EnumProcesses + GetCommandLineEx(Pids[x]) on
>>>> Windows?
>>>>
>>> There is no cross platform way for that so you either need to list the
>>> files in "/proc" (those directories that contain only a number are
>>> processes) or parse the output of e.g. "top". "top" itself afaik scans
>>> "/proc" as well.
>>>
>>> Regards,
>>> Sven
>>>
>>>  Perhaps parsing the ps output is easier since output is already quite
>> configurable. ps is also parsing /proc.
>> As long as you stick to linux, this solution can be made portable between
>> the different flavors. Portablility with other unix's is problematic.
>>
>
> ps parses /proc, but some of the command-line options might vary with
> distro and version. I've used it reasonably successfully on Linux and
> Solaris, my notes from a Perl script:
>
> # For Linux, ps is normally found in /bin/ps. For Solaris it is probably in
> # /usr/bin/ps, but we never want to use the Berkeley one in /usr/ucb/ps
> which
> # has neither the --ppid nor the -f option; code below will probably need
> to
> # be refined for BSD.
>
> I had my "new" SGI system running IRIX briefly yesterday, and could see
> numbered entries in /proc. I didn't investigate the content, or what ps was
> like.
>


PS also varied from implementation to implementation. BusyBox have very
limited version of PS for example.
I think it's easier to look at PS code and implement one in Pascal then to
parse the content PS.


>
> --
> Mark Morgan Lloyd
> markMLl .AT. telemetry.co .DOT. uk
>
> [Opinions above are the author's, not those of his employers or colleagues]
>
>
> --
> ______________________________**_________________
> Lazarus mailing list
> Lazarus at lists.lazarus.**freepascal.org<Lazarus at lists.lazarus.freepascal.org>
> http://lists.lazarus.**freepascal.org/mailman/**listinfo/lazarus<http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.lazarus-ide.org/pipermail/lazarus/attachments/20110814/dd5648c9/attachment-0003.html>