zld | A faster version of Apple 's linker | iOS library

Let me explain: the classic usage for this function is reads from files. Each file ends with EOF. stdin is "special file", because it doesn't have EOF. So how it works? Each time you hit Enter, the string you have typed inserted to the stdin buffer. Each call to getchar() reads single char from this buffer. When you call getchar() and the buffer is empty, the program waits the user to type new string, and hit the Enter. So, when we got EOF from stdin? Basically, never. BUT the user can simulate EOF by type Ctrl+Z. This will enter EOF char, but it have no effect on nothing!. In this case, it is just a char.