s6-linux-init
Software
skarnet.org

The s6-linux-init-shutdownd internal program

s6-linux-init-shutdownd is the daemon that manages the shutdown procedure for a s6-linux-init installation. It is not meant to be called directly by the user.

Interface

     s6-linux-init-shutdownd [ -b bindir ] [ -c basedir ] [ -g gracetime ] fifo

• s6-linux-init-shutdownd opens the fifo named pipe and listens to it. This is where programs such as s6-linux-init-shutdown send their commands when they are told to trigger the shutdown procedure.
• When it receives a command to shut down, s6-linux-init-shutdownd first spawns the stage3 script defined by the last s6-linux-init-maker invocation.
• When this script exits, s6-linux-init-shutdownd kills all processes, first with a SIGTERM, then (after the grace time specified by the shutdown command) with a SIGKILL.
• It then runs the automatically-generated stage 4 script, which unmounts the file systems and halts, powers off or reboots the machine.

Exit codes

• 100: wrong usage, or user does not have root privileges.
• 111: system call failed.

Options

• -b bindir : look for the execlineb script interpreter in the bindir directory. Default is /bin.
• -c basedir : look for the stage3 and stage4 scripts in the basedir directory. Default is /etc/s6-linux-init.
• -g gracetime : if the shutdown command does not specify a grace time between the SIGTERM and the SIGKILL, use gracetime milliseconds. Default is 3000.

Notes

• The s6-linux-init-shutdownd binary is not meant to be called directly by administrators. It is run by a s6 service that is automatically generated by s6-linux-init-maker.