The Story of Jay

exec(): When an exec() system call is invoked, the program specified in the parameter to exec() will replace the entire process - including all threads. exec 를 사용하게 되면 기존에 사용하던 process 를 대체하게 되서 exec_2 를 실행하게 되고 다시 기존 exec process로 돌아가서 실행을 하지 않는다. 따라서 마지막 10번째 come back to exec process 는 프린트 되지 않는다.

fork() : Create new process, Clone current process // system call ->Have exactly the same stack (sequence of function calls) ->Have same virtual memory ( so pointer and other data is preserved) ->No argument ->Return process Id of the child process -> After creation of the process both parent and child process starts execution from next the instruction fork() > 0 //Successful fork() < 0 // Error..