kern_reboot.c

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    1 /*      $NetBSD: kern_reboot.c,v 1.4 2020/02/23 22:56:41 ad Exp $       */
    2 
    3 /*
    4  * Copyright (c) 1982, 1986, 1989, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)kern_xxx.c  8.3 (Berkeley) 2/14/95
   32  *      from: NetBSD: kern_xxx.c,v 1.74 2017/10/28 00:37:11 pgoyette Exp
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __KERNEL_RCSID(0, "$NetBSD: kern_reboot.c,v 1.4 2020/02/23 22:56:41 ad Exp $");
   37 
   38 #include <sys/atomic.h>
   39 #include <sys/param.h>
   40 #include <sys/systm.h>
   41 #include <sys/proc.h>
   42 #include <sys/reboot.h>
   43 #include <sys/syscall.h>
   44 #include <sys/syscallargs.h>
   45 #include <sys/kernel.h>
   46 #include <sys/kauth.h>
   47 
   48 /*
   49  * Reboot / shutdown the system.
   50  */
   51 void
   52 kern_reboot(int howto, char *bootstr)
   53 {
   54         static lwp_t *rebooter;
   55         lwp_t *l;
   56 
   57         /*
   58          * If already rebooting then just hang out.  Allow reentry for the
   59          * benfit of ddb, even if questionable.  It would be better to call
   60          * exit1(), but this is called from all sorts of places.
   61          */
   62         l = atomic_cas_ptr(&rebooter, NULL, curlwp);
   63         while (l != NULL && l != curlwp) {
   64                 (void)kpause("reboot", true, 0, NULL);
   65         }
   66         shutting_down = 1;
   67 
   68         /*
   69          * XXX We should re-factor out all of the common stuff
   70          * that each and every cpu_reboot() does and put it here.
   71          */
   72 
   73         cpu_reboot(howto, bootstr);
   74 }
   75 
   76 /* ARGSUSED */
   77 int
   78 sys_reboot(struct lwp *l, const struct sys_reboot_args *uap, register_t *retval)
   79 {
   80         /* {
   81                 syscallarg(int) opt;
   82                 syscallarg(char *) bootstr;
   83         } */
   84         int error;
   85         char *bootstr, bs[128];
   86 
   87         if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_REBOOT,
   88             0, NULL, NULL, NULL)) != 0)
   89                 return (error);
   90 
   91         /*
   92          * Only use the boot string if RB_STRING is set.
   93          */
   94         if ((SCARG(uap, opt) & RB_STRING) &&
   95             (error = copyinstr(SCARG(uap, bootstr), bs, sizeof(bs), 0)) == 0)
   96                 bootstr = bs;
   97         else
   98                 bootstr = NULL;
   99         /*
  100          * Not all ports use the bootstr currently.
  101          */
  102         kern_reboot(SCARG(uap, opt), bootstr);
  103         return (0);
  104 }

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FreeBSD/Linux Kernel Cross Reference sys/kern/kern_reboot.c

FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_reboot.c