66-olexec (open,lock and execute) opens the active (or specified) tty, locks it and executes a program.
66-olexec [ -h ] [ -d tty ] program
This tool opens the active tty or the one specified by the -d modifier, locks it, and executes a program as a child process of that tty.
It determines the active tty if the -d option is not specified.
It closes the file descriptor stdin and stdout.
It tries to open the tty with read/write permissions.
It reopens stdout at the tty.
It closes stderr and reopens it at the tty.
It gets an exclusive advisory lock on the tty.
It forks and executes program as child and waits until the program exits. If program crashes or get exited, 66-olexec sends a message to stderr with the exit code of the program.
It releases the lock and exits.
-h : prints this help.
-d tty : specifies the tty to use in place of the active one. An absolute path is expected.
66-olexec -d /dev/tty3 cryptsetup open /dev/sda1 cryptroot