LS – Documentation for Showing Output Vertically

It's called "paging output" or (somewhat erroneously) "pagination" …

… and man does it by invoking your preferred pager shell command, named by your PAGER environment variable, upon the output of whatever pipeline was used to generate the output form of the manual page. It falls back to a default if you haven't specified a pager command. On early Unices the default pager program, that man invokes as the default pager command with known hardwired options, was pg. On your system it is probably more or less. Some man commands look at other environment variables for pager commands, as well.

You do it by doing what man is doing: pipe the output of what you want to see into the standard input of a pager program.

You should get yourself a good book on Unix. There are a fair few that explain this, which is a very basic feature of the system. A simple Google Books search for pager unix more by me today turned up over a hundred books that discuss this. (I stopped counting at a hundred.)

man libc covers standard C libraries (glibc, Linux libc) on Linux.

In "SEE ALSO" section, there are

syscalls(2), feature_test_macros(7), man-pages(7), standards(7)

You can look into the details by

man 2 syscalls

man 7 feature_test_macros

man 7 man-pages

man 7 standards