1 Rotation around the front-to-back axis is called roll. 2  Rotation around the side-to-side axis is called pitch. 3  Rotation around the vertical axis is called yaw.  The Ailerons Control Roll. On the outer rear edge of each wing, the two ailerons move in opposite directions, up and down, decreasing lift on one wing while increasing it on the other.
A System call is a mechanism used by an application for requesting a service from the operating system. Examples of the services provided by the operating system are allocation and deallocation of memory, reporting of current date and time etc.
The fork() System Call . System call fork() is used to create processes. It takes no arguments and returns a process ID. The purpose of fork() is to create a new process, which becomes the child process of the caller. After a new child process is created, both processes will execute the next instruction following the fork() system call. Therefore, we have to distinguish the parent from the child.