This is explicitly called out and handled in lines 151-155. https://git.savannah.gnu.org/cgit/hello.git/tree/src/hello.c https://git.savannah.gnu.org/cgit/hell

This is explicitly called out and handled in lines 151-155. https://git.savannah.gnu.org/cgit/hello.git/tree/src/hello.c https://git.savannah.gnu.org/cgit/hello.git/tree/src/hello.c Here's the comment: /* Even exiting has subtleties. On exit, if any writes failed, change the exit status. The /dev/full device on GNU/Linux can be used for testing; for instance, hello >/dev/full should exit unsuccessfully. This is implemented in the Gnulib module "closeout". */