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DEFINITIONS

1. main

   1 /*
   2  * Copyright (c) 2005-2008, Kohsuke Ohtani
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the author nor the names of any co-contibutors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  30 /*
  31  * init.c - traditional POSIX init.
  32  *
  33  * Required capabilities:
  34  *      CAP_NICE, CAP_KILL, CAP_RAWIO
  35  */
  37 #include <sys/prex.h>
  38 #include <sys/wait.h>
  39 #include <unistd.h>
  40 #include <signal.h>
  41 #include <termios.h>
  42 #include <errno.h>
  43 #include <fcntl.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <setjmp.h>
  48 static const char cmdbox[] = "/boot/cmdbox";
  49 static const char sh[]     = "sh";
  50 static const char runcom[] = "/etc/rc";
  51 static const char ctty[]   = "/dev/console";
  53 static jmp_buf jbuf;
  55 /*
  56  * The mother of all processes.
  57  */
  58 int
main(int argc, char *argv[])
  60 {
pid_t pid;
sys_log("init: booting\n");
setsid();
setjmp(jbuf);
close(0);
close(1);
close(2);
pid = vfork();
  74         if (pid == -1)
exit(1);
  77         if (pid == 0) {
  78                 /*
  79                  * Child
  80                  */
signal(SIGHUP, SIG_DFL);
signal(SIGINT, SIG_DFL);
signal(SIGALRM, SIG_DFL);
setsid();
open(ctty, O_RDWR);     /* stdin */
dup(0);                 /* stdout */
dup(0);                 /* stderr */
sys_log("init: running boot script\n");
execl(cmdbox, sh, runcom);
sys_panic("init: no shell");
  92         }
thread_setpri(thread_self(), 254);
  95         while (wait((int *)0) != pid)
  96                 ;
  98         /*
  99          * Login shell is terminated.
 100          */
sys_log("init: restarting...\n");
sync();
kill(-1, SIGTERM);
sleep(1);
longjmp(jbuf, 1);
 107         /* NOTREACHED */
 108         return 0;
 109 }