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# 1  
Old 12-16-2008
process info
Can any one tell me how does 'ps' command get information about the processes from operating system data structures?
# 2  
Old 12-16-2008
It depends on the OS - in Linux you can read /proc files, in HP UX there is a large group of functions lumped together under pstat that gather process information.
# 3  
Old 12-17-2008
Yes jim , i want to do this in Linux itself,I had already tried to do this by reading the /proc directory.but in case of certain process like 'nfs' ,the exe link in the corresponding directory is empty so I thought that the ps command does some thing else to get the process info.Do you know any other ways to get the process information in linux
thanks in advance
Last edited by clintoo; 12-17-2008 at 09:47 AM..
# 4  
Old 12-18-2008
That's probably because you don't have the privileges for reading that info. You can get the full command line of the process by reading /proc/<pid>/cmdline
# 5  
Old 12-19-2008
process info
No, I checked it also in root mode but the exe link was shown as empty and the cmdline file does not contain any thing(for the nfsd process).
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