Bring in System V run-level patches (turned off by default).
While I'm here, fix some typos in the manpage. Requested by: des
This commit is contained in:
Ruslan Ermilov
parent
1427b87c55
commit
1681d65976
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=47998
@ -1,5 +1,5 @@
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# @(#)Makefile 8.1 (Berkeley) 7/19/93
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# $Id: Makefile,v 1.14 1997/08/18 03:32:09 davidn Exp $
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# $Id: Makefile,v 1.15 1998/01/20 10:39:56 bde Exp $
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PROG= init
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MAN8= init.8
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@ -7,6 +7,9 @@ BINMODE=500
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INSTALLFLAGS=-fschg
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CFLAGS+=-DDEBUGSHELL -DSECURE -DLOGIN_CAP
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# Uncomment the following line to activate System V compatibility mode
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#CFLAGS+=-DCOMPAT_SYSV_INIT
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.if exists(${.CURDIR}/../../secure) && !defined(NOCRYPT) && !defined(NOSECURE)
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DISTRIBUTION=des
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DPADD= ${LIBUTIL} ${DESCRYPTOBJDIR}/libdescrypt.a
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@ -33,7 +33,7 @@
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)init.8 8.3 (Berkeley) 4/18/94
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.\" $Id: init.8,v 1.13 1998/12/16 16:50:12 ghelmer Exp $
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.\" $Id: init.8,v 1.14 1999/06/16 20:01:18 ru Exp $
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.\"
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.Dd April 18, 1994
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.Dt INIT 8
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@ -43,24 +43,29 @@
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.Nd process control initialization
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.Sh SYNOPSIS
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.Nm init
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.Nm init
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.Oo
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.Cm 0 | 1 | 6 |
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.Cm c | q
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.Oc
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.Sh DESCRIPTION
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The
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.Nm
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program
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is the last stage of the boot process.
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It normally runs the automatic reboot sequence as described in
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.Xr reboot 8 ,
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.Xr rc 8 ,
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and if this succeeds, begins multi-user operation.
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If the reboot scripts fail,
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.Nm
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commences single user operation by giving
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commences single-user operation by giving
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the super-user a shell on the console.
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The
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.Nm
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program may be passed parameters
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from the boot program to
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prevent the system from going multi-user and to instead execute
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a single user shell without starting the normal daemons.
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a single-user shell without starting the normal daemons.
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The system is then quiescent for maintenance work and may
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later be made to go to multi-user by exiting the
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single-user shell (with ^D).
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@ -75,17 +80,19 @@ If the
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.Em console
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entry in the
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.Xr ttys 5
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file is marked ``insecure'',
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file is marked
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.Dq insecure ,
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then
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.Nm
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will require that the superuser password be
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will require that the super-user password be
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entered before the system will start a single-user shell.
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The password check is skipped if the
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.Em console
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is marked as ``secure''.
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is marked as
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.Dq secure .
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.Pp
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The kernel runs with four different levels of security.
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Any superuser process can raise the security level, but only
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Any super-user process can raise the security level, but only
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.Nm
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can lower it.
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The security levels are:
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@ -119,7 +126,9 @@ IP packet filter rules (see
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.Xr ipfw 8
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and
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.Xr ipfirewall 4 )
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can not be changed and dummynet configuration can not be adjusted.
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can not be changed and
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.Xr dummynet 4
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configuration can not be adjusted.
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.El
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.Pp
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If the security level is initially -1, then
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@ -127,10 +136,10 @@ If the security level is initially -1, then
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leaves it unchanged.
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Otherwise,
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.Nm
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arranges to run the system in level 0 mode while single user
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and in level 1 mode while multiuser.
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If level 2 mode is desired while running multiuser,
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it can be set while single user, e.g., in the startup script
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arranges to run the system in level 0 mode while single-user
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and in level 1 mode while multi-user.
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If level 2 mode is desired while running multi-user,
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it can be set while single-user, e.g., in the startup script
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.Pa /etc/rc ,
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using
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.Xr sysctl 8
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@ -237,7 +246,7 @@ and allow the system to slowly die away, if it is sent a terminal stop
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signal, i.e.
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.Dq Li "kill \-TSTP 1" .
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A later hangup will resume full
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multi-user operations, or a terminate will start a single user shell.
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multi-user operations, or a terminate will start a single-user shell.
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This hook is used by
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.Xr reboot 8
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and
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@ -253,10 +262,10 @@ This is useful for shutting the machine down cleanly from inside the kernel
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or from X when the machine appears to be hung.
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.Pp
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.Nm Init
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will do the same, except it will shutdown the machine if sent
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will do the same, except it will halt the machine if sent
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the user defined signal 1
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.Pq Dv USR1 ,
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or will shutdown and turn the power off (if hardware permits) if sent
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or will halt and turn the power off (if hardware permits) if sent
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the user defined signal 2
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.Pq Dv USR2 .
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.Pp
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@ -276,14 +285,42 @@ automatically.
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If, at bootstrap time, the
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.Nm
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process cannot be located, the system will panic with the message
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``panic: "init died (signal %d, exit %d)''.
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.Dq "panic: init died (signal %d, exit %d)" .
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.Pp
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The second synopsis form is only available if
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.Nm
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was compiled with the
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.Em COMPAT_SYSV_INIT
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option.
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In this case,
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.Nm
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will emulate
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.At V
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behavior, i.e. super-user can specify the desired
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.Em run-level
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on a command line, and
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.Nm
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will signal the original
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.Pq PID 1
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.Nm
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as follows:
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.Bl -column Run-level SIGTERM
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.It Sy Run-level Signal Action
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.It Cm 0 Ta Dv SIGUSR2 Ta "Halt and turn the power off"
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.It Cm 1 Ta Dv SIGTERM Ta "Go to single-user mode"
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.It Cm 6 Ta Dv SIGINT Ta "Reboot the machine"
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.It Cm c Ta Dv SIGTSTP Ta "Block further logins"
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.It Cm q Ta Dv SIGHUP Ta Rescan the
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.Xr ttys 5
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file
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.El
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.Sh DIAGNOSTICS
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.Bl -diag
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.It "getty repeating too quickly on port %s, sleeping"
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A process being started to service a line is exiting quickly
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each time it is started.
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This is often caused by a ringing or noisy terminal line.
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.Em "Init will sleep for 10 seconds" ,
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.Em "Init will sleep for 30 seconds" ,
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.Em "then continue trying to start the process" .
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.Pp
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.It "some processes would not die; ps axl advised."
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@ -315,6 +352,7 @@ system shutdown commands
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.Xr kill 1 ,
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.Xr login 1 ,
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.Xr sh 1 ,
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.Xr dummynet 4 ,
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.Xr ipfirewall 4 ,
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.Xr ttys 5 ,
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.Xr crash 8 ,
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@ -45,7 +45,7 @@ static const char copyright[] =
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static char sccsid[] = "@(#)init.c 8.1 (Berkeley) 7/15/93";
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#endif
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static const char rcsid[] =
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"$Id: init.c,v 1.31 1998/07/22 05:45:11 phk Exp $";
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"$Id: init.c,v 1.32 1999/06/16 20:01:19 ru Exp $";
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#endif /* not lint */
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#include <sys/param.h>
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@ -204,9 +204,42 @@ main(argc, argv)
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errx(1, "%s", strerror(EPERM));
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/* System V users like to reexec init. */
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if (getpid() != 1)
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errx(1, "already running");
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if (getpid() != 1) {
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#ifdef COMPAT_SYSV_INIT
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/* So give them what they want */
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if (argc > 1) {
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if (strlen(argv[1]) == 1) {
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register char runlevel = *argv[1];
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register int sig;
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switch (runlevel) {
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case '0': /* halt + poweroff */
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sig = SIGUSR2;
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break;
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case '1': /* single-user */
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sig = SIGTERM;
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break;
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case '6': /* reboot */
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sig = SIGINT;
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break;
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case 'c': /* block further logins */
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sig = SIGTSTP;
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break;
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case 'q': /* rescan /etc/ttys */
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sig = SIGHUP;
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break;
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default:
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goto invalid;
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}
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kill(1, sig);
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_exit(0);
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} else
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invalid:
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errx(1, "invalid run-level ``%s''", argv[1]);
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} else
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#endif
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errx(1, "already running");
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}
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/*
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* Note that this does NOT open a file...
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* Does 'init' deserve its own facility number?
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