***
***
I’m trying out this simple C program [https://www.gnu.org/software/guile/manual/guile.html#Linking-Guile-into-Programs] that uses libguile. The hostname on my distro is called “guix”, but for some reason, it shows #f, which I’m assuming is the boolean value “false”, when I build and run the program ...
Permanently Deleted
It appears that this is actually a Bash thing rather than a Guile thing:
https://superuser.com/questions/132489/hostname-environment-variable-on-linux
HOSTNAMEis a variable that bash (but not other shells) sets by default. It is not exported.Since it's not exported, it will not be inherited by
envor any C program invoked from a bash shell.For more information about why, see the comment in this other answer which mentions that
HOSTNAMEis not required for POSIX compliance:https://superuser.com/questions/132489/hostname-environment-variable-on-linux/132500#132500
https://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap08.html
Curiously, I can reproduce this on my Guix System, but actually not on my Fedora system (where it is exported automatically), so I guess some distros choose to explicitly export the
HOSTNAMEvariable?