I know that the PCB is a data structure which includes parent process id(pPID), process id(PID), pointers, and etc. Is there anyway to find the PID of parent process without using getppid function?
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Why don't you want to use `getppid()`? What programming language are you using? – John Zwinck Oct 11 '20 at 02:15
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The fields of /proc/self/stat (as documented in proc(5)) include PPID. Take care in parsing as comm may contain spaces and other unusual characters.
(But I second @JohnZwinck's comment. Why?)
ephemient
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To find a way to imply 'getppid'-like system call in a new shell which the getppid function is not implemented yet. – Jason.P Oct 11 '20 at 11:42