get command from pid in gtk programm

hi all 
 i am facing a problem i need to know what command fired the process with the given pid just like CMD ooption 
of ps command. But the issue is that due to timing constraint i don't have enough time to everytime fire a 
shell which writes this cmd from ps to a file and read it . i need to be able to get it in my program .
 i can get the pid by using libwnck library which is working just fine.
 any ideas how can i get this in my program .
 thanks in advance.
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