segmentation fault vs page fault

Question

1. I was wondering what differences and relations are between segmentation fault and page fault?

2. Does segmentation fault only belong to segmented memor

Answer 1

Segmentation faults occur when the memory is not allowed to be accessed (does not exist, or is forbidden). Most frequently they occur when you dereference a null variable or run off the end of an array. Page faults occur when memory that is mapped but not loaded is accessed. They are not errors, and signal to the operating system that it should load the appropriate page into memory.