root / prex-0.9.0 / usr / sbin / init / init.c @ 03e9c04a
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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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} |