10.60. Sysvinit-2.86

#### Cross-Compiled Linux From Scratch - Version 1.0.0rc1-Sparc64-Multilib

### Chapter 10. Installing Basic System Software

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# 10.60. Sysvinit-2.86

The Sysvinit package contains programs for controlling the startup, running, and shutdown of the system.

## 10.60.1. Installation of Sysvinit

When run-levels are changed (for example, when halting the system), init sends termination signals to those processes that init itself started and that should not be running in the new run-level. While doing this, init outputs messages like “Sending processes the TERM signal” which seem to imply that it is sending these signals to all currently running processes. To avoid this misinterpretation, modify the source so that these messages read like “Sending processes started by init the TERM signal” instead:

    sed -i 's@Sending processes@& started by init@g' \
        src/init.c

Compile the package:

    make -C src clobber
    make -C src CC="gcc ${BUILD64}"

Install the package:

    make -C src install

## 10.60.2. Configuring Sysvinit

Create a new file `/etc/inittab` by running the following:

    cat > /etc/inittab << "EOF"
    # Begin /etc/inittab

    id:3:initdefault:

    si::sysinit:/etc/rc.d/init.d/rc sysinit

    l0:0:wait:/etc/rc.d/init.d/rc 0
    l1:S1:wait:/etc/rc.d/init.d/rc 1
    l2:2:wait:/etc/rc.d/init.d/rc 2
    l3:3:wait:/etc/rc.d/init.d/rc 3
    l4:4:wait:/etc/rc.d/init.d/rc 4
    l5:5:wait:/etc/rc.d/init.d/rc 5
    l6:6:wait:/etc/rc.d/init.d/rc 6

    ca:12345:ctrlaltdel:/sbin/shutdown -t1 -a -r now

    su:S016:once:/sbin/sulogin

    # Remove this section if you System only
    # has a console port
    1:2345:respawn:/sbin/agetty -I '\033(K' tty1 9600
    2:2345:respawn:/sbin/agetty -I '\033(K' tty2 9600
    3:2345:respawn:/sbin/agetty -I '\033(K' tty3 9600
    4:2345:respawn:/sbin/agetty -I '\033(K' tty4 9600
    5:2345:respawn:/sbin/agetty -I '\033(K' tty5 9600
    6:2345:respawn:/sbin/agetty -I '\033(K' tty6 9600

    # Uncomment this section if your system has a console
    # port
    #c0:12345:respawn:/sbin/agetty 9600 ttyS0 vt100

    # End /etc/inittab
    EOF

## 10.60.3. Contents of Sysvinit

Installed programs: bootlogd, halt, init, killall5, last, lastb (link to last), mesg, mountpoint, pidof (link to killall5), poweroff (link to halt), reboot (link to halt), runlevel, shutdown, sulogin, telinit (link to init), utmpdump, and wall

### Short Descriptions

bootlogd | Logs boot messages to a log file
halt | Normally invokes shutdown with the `-h` option, except when already in run-level 0, then it tells the kernel to halt the system; it notes in the file `/var/log/wtmp` that the system is being brought down
init | The first process to be started when the kernel has initialized the hardware which takes over the boot process and starts all the proceses it is instructed to
killall5 | Sends a signal to all processes, except the processes in its own session so it will not kill the shell running the script that called it
last | Shows which users last logged in (and out), searching back through the `/var/log/wtmp` file; it also shows system boots, shutdowns, and run-level changes
lastb | Shows the failed login attempts, as logged in `/var/log/btmp`
mesg | Controls whether other users can send messages to the current user's terminal
mountpoint | Tells you whether or not a directory is a mount point.
pidof | Reports the PIDs of the given programs
poweroff | Tells the kernel to halt the system and switch off the computer (see halt)
reboot | Tells the kernel to reboot the system (see halt)
runlevel | Reports the previous and the current run-level, as noted in the last run-level record in `/var/run/utmp`
shutdown | Brings the system down in a secure way, signaling all processes and notifying all logged-in users
sulogin | Allows root to log in; it is normally invoked by init when the system goes into single user mode
telinit | Tells init which run-level to change to
utmpdump | Displays the content of the given login file in a more user-friendly format
wall | Writes a message to all logged-in users

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