Commands like man 2 socket or man 3 printf say that there is no such manual page. How do I install the corresponding man pages?
I am on macOS Sierra, and XCode 8.0 is installed.
I use zsh if the shell matters in some way.
MacBook (13-inch Mid 2010), macOS Sierra (10.12), ZSH shell
You need your environment variable MANPATH set to .:/usr/share/man: in zsh if it is not. I have Xcode 8 and the command line tools installed, and have no issue with man pages, including those that you have mentioned. I use Bash, not zsh.
You can optionally extend the MANPATH search order by adding /usr/local/share/man: and this let you see those pages added in that location by non-Apple software.
I checked my MANPATH, and /usr/share/man is included. But checking out that folder, turns out that man2 and man3 folders themselves are missing.
Is there a way to get back or download those folders?
Those folders are installed via: Command Line Tools (macOS Sierra version 10.12).pkg which is available at the Apple Developer website.
BSD System Calls and C Library Functions manual pages missing
