cpuer questions

• Why updating time is so important for a web server like nginx?
• Is PHP immune to "HTTP Response Splitting" vulnerabilities?
• So malloc doesn't invoke any syscall?
• Why many servers change its uid and gid,what's the benefit?
• What is program break? Where does it start from,0x00?
• When is a semicolon after } mandated in c/c++?
• What is \363\353\377\377\377\177?
• When is umask() useful?
• Is a tree with all black nodes a red black tree?
• Why isn't operator overloading for pointers allowed to work?

cpuer answers