If it helps, the numbers in parantheses after read, malloc, calloc etc. are referring to the page number in the man pages. e.g typing `man 2 read` into the she

If it helps, the numbers in parantheses after read, malloc, calloc etc. are referring to the page number in the man pages. e.g typing `man 2 read` into the shell on a Unix system will give you information about the read system call. 2's are for system calls, 3's are for members of the C standard library (usually).