add directory Minix

2024-02-19 00:21:39 -05:00
parent 56596ada90
commit 5a46ddb732
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--- a/Minix/CD-ROM-2.0/MINIX/MANUALS/CAT8/INIT.8
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+
+
+INIT(8)                   Minix Programmer's Manual                    INIT(8)
+
+
+NAME
+     init - grandparent of all processes
+
+DESCRIPTION
+     The first program started by Minix is init.   The  actions  performed  by
+     init can be summarized by this pseudo shell program:
+
+          # Open 0, 1, 2.
+          exec </dev/null >/dev/log 2>&1
+
+          # Run the system initialization script.
+          sh /etc/rc $bootopts
+
+          >/etc/utmp
+          echo reboot >>/usr/adm/wtmp
+
+          while :; do
+                  # Wait for a process to exit, but don't always block.
+                  wait
+
+                  # Record logout.  (Not in this dumb way, of course.)
+                  if "pid is in my tables" $pid
+                  then
+                          echo "logout $pid" >/etc/utmp
+                          echo "logout $pid" >>/usr/adm/wtmp
+                  fi
+
+                  # Start a new session.
+                  while read line type getty init
+                  do
+                          if idle $line
+                          then
+                                  $init ... <$tty >$tty
+                                  $getty <$tty >$tty 2>&1 &
+                                  pid=$!
+                                  "add pid to tables" $pid
+                                  echo "login $line $pid" >/etc/utmp
+                                  echo "login $line $pid" >>/usr/adm/wtmp
+                          fi
+                  done < /dev/ttytab
+          done
+
+     The first action of init is to run /etc/rc to initialize  the  system  as
+     described  in boot(8).  Init then enters its main loop where it waits for
+     processes to exit, and starts processes on each  enabled  terminal  line.
+     The  file /etc/ttytab contains a list of terminal devices, their terminal
+     types, the program to execute on them to  allow  one  to  login  (usually
+     getty(8)),  and  the  program  to  execute  first  to initialize the line
+     (usually stty(1)).  These fields may be left out to indicate that a  line
+     is  disabled  or  that initialization is not necessary.  The commands are
+
+
+                                                                             1
+
+
+
+INIT(8)                   Minix Programmer's Manual                    INIT(8)
+
+
+     searched using the path /sbin:/bin:/usr/sbin:/usr/bin.
+
+     Init accepts several signals that must be sent to process id 1.   (It  is
+     the first process, so natually its process id is 1.)  The signals are:
+
+     SIGHUP
+          When receiving a hangup signal, init will forget  about  errors  and
+          rescan  ttytab  for  processes  to  execute.   Init normally rescans
+          ttytab each time it feels the need to  respawn  a  process,  so  the
+          hangup  signal is only needed if a line has been shut down, or after
+          a terminate signal.  Note that after turning a  line  off  you  will
+          have to kill the process running on that line manually, init doesn't
+          do that for you.
+
+     SIGTERM
+          Normally sent by programs that halt or reboot Minix.  Causes init to
+          stop spawning new processes.
+
+     SIGABRT
+          Sent by the keyboard driver when the CTRL-ALT-DEL key combination is
+          typed.   Causes  init  to  run the shutdown command.  A second abort
+          signal makes init halt the system directly with a system call.   The
+          keyboard  driver  halts  the system, without a sync, after the third
+          CTRL-ALT-DEL.
+
+  Minix vs. Minix-vmd
+     There are a few differences between standard Minix and Minix-vmd  on  how
+     init  is  run.   The  /etc/rc  file is executed under standard Minix with
+     input connected to  /dev/console,  but  under  Minix-vmd  this  is  still
+     /dev/null.  This means that under Minix-vmd processes must be reconnected
+     to /dev/console with the intr program  if  they  need  user  interaction.
+     Minix-vmd  passes  the  value  of  the bootopts boot variable to /etc/rc.
+     Standard Minix does not.
+
+FILES
+
+     /etc/ttytab              List of terminals devices.
+
+     /etc/utmp                List of currently logged in users.
+
+     /usr/adm/wtmp            Login/logout history.
+
+SEE ALSO
+     ttytab(5), utmp(5), getty(8), stty(1), boot(8).
+
+AUTHOR
+     Kees J. Bot (kjb@cs.vu.nl)
+
+
+
+
+
+                                                                             2
+