root / prex-0.9.0 / usr / sbin / init / init.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*
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2 | * Copyright (c) 2005-2008, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contibutors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | /*
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31 | * init.c - traditional POSIX init.
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32 | *
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33 | * Required capabilities:
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34 | * CAP_NICE, CAP_KILL, CAP_RAWIO
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35 | */
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36 | |||
37 | #include <sys/prex.h> |
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38 | #include <sys/wait.h> |
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39 | #include <unistd.h> |
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40 | #include <signal.h> |
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41 | #include <termios.h> |
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42 | #include <errno.h> |
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43 | #include <fcntl.h> |
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44 | #include <stdio.h> |
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45 | #include <stdlib.h> |
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46 | #include <setjmp.h> |
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47 | |||
48 | static const char cmdbox[] = "/boot/cmdbox"; |
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49 | static const char sh[] = "sh"; |
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50 | static const char runcom[] = "/etc/rc"; |
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51 | static const char ctty[] = "/dev/console"; |
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52 | |||
53 | static jmp_buf jbuf;
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54 | |||
55 | /*
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56 | * The mother of all processes.
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57 | */
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58 | int
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59 | main(int argc, char *argv[]) |
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60 | { |
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61 | pid_t pid; |
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62 | |||
63 | sys_log("init: booting\n");
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64 | setsid(); |
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65 | |||
66 | setjmp(jbuf); |
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67 | |||
68 | close(0);
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69 | close(1);
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70 | close(2);
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71 | |||
72 | pid = vfork(); |
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73 | |||
74 | if (pid == -1) |
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75 | exit(1);
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76 | |||
77 | if (pid == 0) { |
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78 | /*
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79 | * Child
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80 | */
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81 | signal(SIGHUP, SIG_DFL); |
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82 | signal(SIGINT, SIG_DFL); |
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83 | signal(SIGALRM, SIG_DFL); |
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84 | setsid(); |
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85 | open(ctty, O_RDWR); /* stdin */
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86 | dup(0); /* stdout */ |
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87 | dup(0); /* stderr */ |
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88 | |||
89 | sys_log("init: running boot script\n");
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90 | execl(cmdbox, sh, runcom); |
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91 | sys_panic("init: no shell");
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92 | } |
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93 | |||
94 | thread_setpri(thread_self(), 254);
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95 | while (wait((int *)0) != pid) |
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96 | ; |
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97 | |||
98 | /*
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99 | * Login shell is terminated.
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100 | */
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101 | sys_log("init: restarting...\n");
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102 | sync(); |
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103 | kill(-1, SIGTERM);
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104 | sleep(1);
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105 | longjmp(jbuf, 1);
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106 | |||
107 | /* NOTREACHED */
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108 | return 0; |
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109 | } |