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so is it saying that i cant use the /proc/<pid>/stat to constantly check the sp of a running process, because it is always going to be zero ?
– Hodgson Tetteh
Commented Jun 4 at 18:04
Yes, that is correct. As the quote states, a program can use ptrace(2) system call to obtain reliable values. GDB can also attach to a process (using -p as root) to debug it.
– Vilinkameni
Commented Jun 4 at 18:23
I updated the answer with the exact line preceding the comment, which zeroes out the three local variables.
– Vilinkameni
Commented Jun 4 at 18:31

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