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