1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Poweroff reboot and halt, oh my.
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4 | *
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5 | * Copyright 2006 by Rob Landley <rob@landley.net>
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6 | *
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7 | * Licensed under GPLv2, see file LICENSE in this source tree.
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8 | */
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9 |
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10 | //applet:IF_HALT(APPLET(halt, BB_DIR_SBIN, BB_SUID_DROP))
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11 | //applet:IF_HALT(APPLET_ODDNAME(poweroff, halt, BB_DIR_SBIN, BB_SUID_DROP, poweroff))
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12 | //applet:IF_HALT(APPLET_ODDNAME(reboot, halt, BB_DIR_SBIN, BB_SUID_DROP, reboot))
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13 |
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14 | //kbuild:lib-$(CONFIG_HALT) += halt.o
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15 |
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16 | //config:config HALT
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17 | //config: bool "poweroff, halt, and reboot"
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18 | //config: default y
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19 | //config: help
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20 | //config: Stop all processes and either halt, reboot, or power off the system.
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21 | //config:
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22 | //config:config FEATURE_CALL_TELINIT
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23 | //config: bool "Call telinit on shutdown and reboot"
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24 | //config: default y
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25 | //config: depends on HALT && !INIT
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26 | //config: help
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27 | //config: Call an external program (normally telinit) to facilitate
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28 | //config: a switch to a proper runlevel.
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29 | //config:
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30 | //config: This option is only available if you selected halt and friends,
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31 | //config: but did not select init.
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32 | //config:
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33 | //config:config TELINIT_PATH
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34 | //config: string "Path to telinit executable"
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35 | //config: default "/sbin/telinit"
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36 | //config: depends on FEATURE_CALL_TELINIT
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37 | //config: help
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38 | //config: When busybox halt and friends have to call external telinit
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39 | //config: to facilitate proper shutdown, this path is to be used when
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40 | //config: locating telinit executable.
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41 |
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42 | //usage:#define halt_trivial_usage
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43 | //usage: "[-d DELAY] [-n] [-f]" IF_FEATURE_WTMP(" [-w]")
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44 | //usage:#define halt_full_usage "\n\n"
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45 | //usage: "Halt the system\n"
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46 | //usage: "\n -d SEC Delay interval"
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47 | //usage: "\n -n Do not sync"
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48 | //usage: "\n -f Force (don't go through init)"
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49 | //usage: IF_FEATURE_WTMP(
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50 | //usage: "\n -w Only write a wtmp record"
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51 | //usage: )
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52 | //usage:
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53 | //usage:#define poweroff_trivial_usage
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54 | //usage: "[-d DELAY] [-n] [-f]"
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55 | //usage:#define poweroff_full_usage "\n\n"
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56 | //usage: "Halt and shut off power\n"
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57 | //usage: "\n -d SEC Delay interval"
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58 | //usage: "\n -n Do not sync"
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59 | //usage: "\n -f Force (don't go through init)"
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60 | //usage:
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61 | //usage:#define reboot_trivial_usage
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62 | //usage: "[-d DELAY] [-n] [-f]"
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63 | //usage:#define reboot_full_usage "\n\n"
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64 | //usage: "Reboot the system\n"
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65 | //usage: "\n -d SEC Delay interval"
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66 | //usage: "\n -n Do not sync"
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67 | //usage: "\n -f Force (don't go through init)"
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68 |
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69 | #include "libbb.h"
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70 | #include "reboot.h"
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71 |
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72 | #if ENABLE_FEATURE_WTMP
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73 | #include <sys/utsname.h>
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74 |
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75 | static void write_wtmp(void)
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76 | {
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77 | struct utmpx utmp;
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78 | struct utsname uts;
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79 | /* "man utmp" says wtmp file should *not* be created automagically */
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80 | /*if (access(bb_path_wtmp_file, R_OK|W_OK) == -1) {
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81 | close(creat(bb_path_wtmp_file, 0664));
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82 | }*/
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83 | memset(&utmp, 0, sizeof(utmp));
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84 | utmp.ut_tv.tv_sec = time(NULL);
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85 | strcpy(utmp.ut_user, "shutdown"); /* it is wide enough */
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86 | utmp.ut_type = RUN_LVL;
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87 | utmp.ut_id[0] = '~'; utmp.ut_id[1] = '~'; /* = strcpy(utmp.ut_id, "~~"); */
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88 | utmp.ut_line[0] = '~'; utmp.ut_line[1] = '~'; /* = strcpy(utmp.ut_line, "~~"); */
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89 | uname(&uts);
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90 | safe_strncpy(utmp.ut_host, uts.release, sizeof(utmp.ut_host));
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91 | updwtmpx(bb_path_wtmp_file, &utmp);
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92 | }
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93 | #else
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94 | #define write_wtmp() ((void)0)
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95 | #endif
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96 |
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97 |
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98 | int halt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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99 | int halt_main(int argc UNUSED_PARAM, char **argv)
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100 | {
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101 | static const int magic[] = {
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102 | RB_HALT_SYSTEM,
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103 | RB_POWER_OFF,
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104 | RB_AUTOBOOT
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105 | };
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106 | static const smallint signals[] = { SIGUSR1, SIGUSR2, SIGTERM };
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107 |
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108 | int delay = 0;
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109 | int which, flags, rc;
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110 |
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111 | /* Figure out which applet we're running */
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112 | for (which = 0; "hpr"[which] != applet_name[0]; which++)
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113 | continue;
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114 |
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115 | /* Parse and handle arguments */
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116 | opt_complementary = "d+"; /* -d N */
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117 | /* We support -w even if !ENABLE_FEATURE_WTMP,
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118 | * in order to not break scripts.
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119 | * -i (shut down network interfaces) is ignored.
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120 | */
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121 | flags = getopt32(argv, "d:nfwi", &delay);
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122 |
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123 | sleep(delay);
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124 |
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125 | write_wtmp();
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126 |
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127 | if (flags & 8) /* -w */
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128 | return EXIT_SUCCESS;
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129 |
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130 | if (!(flags & 2)) /* no -n */
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131 | sync();
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132 |
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133 | /* Perform action. */
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134 | rc = 1;
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135 | if (!(flags & 4)) { /* no -f */
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136 | //TODO: I tend to think that signalling linuxrc is wrong
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137 | // pity original author didn't comment on it...
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138 | if (ENABLE_LINUXRC) {
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139 | /* talk to linuxrc */
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140 | /* bbox init/linuxrc assumed */
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141 | pid_t *pidlist = find_pid_by_name("linuxrc");
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142 | if (pidlist[0] > 0)
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143 | rc = kill(pidlist[0], signals[which]);
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144 | if (ENABLE_FEATURE_CLEAN_UP)
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145 | free(pidlist);
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146 | }
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147 | if (rc) {
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148 | /* talk to init */
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149 | if (!ENABLE_FEATURE_CALL_TELINIT) {
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150 | /* bbox init assumed */
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151 | rc = kill(1, signals[which]);
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152 | } else {
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153 | /* SysV style init assumed */
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154 | /* runlevels:
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155 | * 0 == shutdown
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156 | * 6 == reboot */
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157 | execlp(CONFIG_TELINIT_PATH,
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158 | CONFIG_TELINIT_PATH,
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159 | which == 2 ? "6" : "0",
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160 | (char *)NULL
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161 | );
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162 | bb_perror_msg_and_die("can't execute '%s'",
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163 | CONFIG_TELINIT_PATH);
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164 | }
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165 | }
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166 | } else {
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167 | rc = reboot(magic[which]);
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168 | }
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169 |
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170 | if (rc)
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171 | bb_perror_nomsg_and_die();
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172 | return rc;
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173 | }
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