17.17.3.1. Start a getty from outside of init
TODO: how to place an sh directly on a TTY as well without getty?
If I try the exact same command that the inittab is doing from a regular shell after boot:
/sbin/getty 0 tty1
it fails with:
getty: setsid: Operation not permitted
The following however works:
./run --eval 'getty 0 tty1 & getty 0 tty2 & getty 0 tty3 & sleep 99999999' --graphic
presumably because it is being called from init directly?
Outcome: Alt-Right cycles between three TTYs, tty1 being the default one that appears under the boot messages.
man 2 setsid says that there is only one failure possibility:
EPERM The process group ID of any process equals the PID of the calling process. Thus, in particular, setsid() fails if the calling process is already a process group leader.
We can get some visibility into it to try and solve the problem with:
./psa.sh