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Do you know any good web site about system programming?

I've been looking for sites about C-programming in UNIX environment.. and emulating UNIX command by C..
but there is little about that..
...

first of all..
thanks for your kindly reply..

I want to know about getting cpu percentage not use structure
because in SCO-UNIX, there is no cpu percentage ..but only
cpu time ( timestruc_t...

you know that.. in HP-UX..
in sys/pstat.h

struct pst_status {
long pst_idx; /* Index for further pstat() requests */
long pst_uid; /* Real UID */
long pst_pid; /*...

I made a liitle source about that..
BUt I got a trouble when making files'authority..

How can I display them??

p.s.) used struct stat ..