rongz
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get active process list in linux
Hi,
In HP-UX, you can get a list of active processes and their relevant information by calling pstat_getproc(). How can this be achieved in linux using c/c++? I.e. how can i get a list of current running processes?
It seems that one way to do it is: read the /proc and go to all /proc/xxxx/staus(xxxx are digits) and check if xxxx is in running state, if yes, count the process as active process and push it to a list. I wonder if there is other simple way and can somebody show me an example. Thanks.
In HP-UX, you can get a list of active processes and their relevant information by calling pstat_getproc(). How can this be achieved in linux using c/c++? I.e. how can i get a list of current running processes?
It seems that one way to do it is: read the /proc and go to all /proc/xxxx/staus(xxxx are digits) and check if xxxx is in running state, if yes, count the process as active process and push it to a list. I wonder if there is other simple way and can somebody show me an example. Thanks.
sunnycoder
You can launch "ps -a" command using exec() or system() or popen()
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No linux requires You to scan /proc
And ps in fact reads /proc/[PID]/stat
And ps in fact reads /proc/[PID]/stat
Even if ps reads from proc it saves significant programming effort to call ps rather than duplicate the functionality in own program!!
ASKER
By the way, In HP-UX, ticks of cpu time of a process can be get from
pst_status structure filled when calling pstat_getproc().
How in linux get the ticks of cpu time of a process. Thanks.
pst_status structure filled when calling pstat_getproc().
How in linux get the ticks of cpu time of a process. Thanks.
utime and stime entries in /proc/pid/stat ...