text: /*
   * Copyright (c) 2005-2008, Kohsuke Ohtani
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the author nor the names of any co-contibutors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  /*
   * init.c - traditional POSIX init.
   *
   * Required capabilities:
   *      CAP_NICE, CAP_KILL, CAP_RAWIO
   */
  
  #include <sys/prex.h>
  #include <sys/wait.h>
  #include <unistd.h>
  #include <signal.h>
  #include <termios.h>
  #include <errno.h>
  #include <fcntl.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <setjmp.h>
  
  static const char cmdbox[] = "/boot/cmdbox";
  static const char sh[] = "sh";
  static const char runcom[] = "/etc/rc";
  static const char ctty[] = "/dev/console";
  
  static jmp_buf jbuf;
  
  /*
   * The mother of all processes.
   */
  int main(int argc, char* argv[])
  {
      pid_t pid;
  
      sys_log("init: booting\n");
      setsid();
  
      setjmp(jbuf);
  
      close(0);
      close(1);
      close(2);
  
      pid = vfork();
  
      if (pid == -1)
          exit(1);
  
      if (pid == 0) {
          /*
           * Child
           */
          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, NULL);
          sys_panic("init: no shell");
      }
  
      thread_setpri(thread_self(), 254);
      while (wait((int*)0) != pid)
          ;
  
      /*
       * Login shell is terminated.
       */
      sys_log("init: restarting...\n");
      sync();
      kill(-1, SIGTERM);
      sleep(1);
      longjmp(jbuf, 1);
  
      /* NOTREACHED */
      return 0;
  }
  