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path: root/init/halt.c (plain)
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1/* vi: set sw=4 ts=4: */
2/*
3 * Poweroff reboot and halt, oh my.
4 *
5 * Copyright 2006 by Rob Landley <rob@landley.net>
6 *
7 * Licensed under GPLv2, see file LICENSE in this source tree.
8 */
9
10//applet:IF_HALT(APPLET(halt, BB_DIR_SBIN, BB_SUID_DROP))
11//applet:IF_HALT(APPLET_ODDNAME(poweroff, halt, BB_DIR_SBIN, BB_SUID_DROP, poweroff))
12//applet:IF_HALT(APPLET_ODDNAME(reboot, halt, BB_DIR_SBIN, BB_SUID_DROP, reboot))
13
14//kbuild:lib-$(CONFIG_HALT) += halt.o
15
16//config:config HALT
17//config: bool "poweroff, halt, and reboot"
18//config: default y
19//config: help
20//config: Stop all processes and either halt, reboot, or power off the system.
21//config:
22//config:config FEATURE_CALL_TELINIT
23//config: bool "Call telinit on shutdown and reboot"
24//config: default y
25//config: depends on HALT && !INIT
26//config: help
27//config: Call an external program (normally telinit) to facilitate
28//config: a switch to a proper runlevel.
29//config:
30//config: This option is only available if you selected halt and friends,
31//config: but did not select init.
32//config:
33//config:config TELINIT_PATH
34//config: string "Path to telinit executable"
35//config: default "/sbin/telinit"
36//config: depends on FEATURE_CALL_TELINIT
37//config: help
38//config: When busybox halt and friends have to call external telinit
39//config: to facilitate proper shutdown, this path is to be used when
40//config: locating telinit executable.
41
42//usage:#define halt_trivial_usage
43//usage: "[-d DELAY] [-n] [-f]" IF_FEATURE_WTMP(" [-w]")
44//usage:#define halt_full_usage "\n\n"
45//usage: "Halt the system\n"
46//usage: "\n -d SEC Delay interval"
47//usage: "\n -n Do not sync"
48//usage: "\n -f Force (don't go through init)"
49//usage: IF_FEATURE_WTMP(
50//usage: "\n -w Only write a wtmp record"
51//usage: )
52//usage:
53//usage:#define poweroff_trivial_usage
54//usage: "[-d DELAY] [-n] [-f]"
55//usage:#define poweroff_full_usage "\n\n"
56//usage: "Halt and shut off power\n"
57//usage: "\n -d SEC Delay interval"
58//usage: "\n -n Do not sync"
59//usage: "\n -f Force (don't go through init)"
60//usage:
61//usage:#define reboot_trivial_usage
62//usage: "[-d DELAY] [-n] [-f]"
63//usage:#define reboot_full_usage "\n\n"
64//usage: "Reboot the system\n"
65//usage: "\n -d SEC Delay interval"
66//usage: "\n -n Do not sync"
67//usage: "\n -f Force (don't go through init)"
68
69#include "libbb.h"
70#include "reboot.h"
71
72#ifdef __BIONIC__
73# include "android/reboot.c"
74#endif
75
76#if ENABLE_FEATURE_WTMP
77#include <sys/utsname.h>
78
79static void write_wtmp(void)
80{
81 struct utmp utmp;
82 struct utsname uts;
83 /* "man utmp" says wtmp file should *not* be created automagically */
84 /*if (access(bb_path_wtmp_file, R_OK|W_OK) == -1) {
85 close(creat(bb_path_wtmp_file, 0664));
86 }*/
87 memset(&utmp, 0, sizeof(utmp));
88 utmp.ut_tv.tv_sec = time(NULL);
89 strcpy(utmp.ut_user, "shutdown"); /* it is wide enough */
90 utmp.ut_type = RUN_LVL;
91 utmp.ut_id[0] = '~'; utmp.ut_id[1] = '~'; /* = strcpy(utmp.ut_id, "~~"); */
92 utmp.ut_line[0] = '~'; utmp.ut_line[1] = '~'; /* = strcpy(utmp.ut_line, "~~"); */
93 uname(&uts);
94 safe_strncpy(utmp.ut_host, uts.release, sizeof(utmp.ut_host));
95 updwtmp(bb_path_wtmp_file, &utmp);
96}
97#else
98#define write_wtmp() ((void)0)
99#endif
100
101
102int halt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
103int halt_main(int argc UNUSED_PARAM, char **argv)
104{
105 static const int magic[] = {
106 RB_HALT_SYSTEM,
107 RB_POWER_OFF,
108 RB_AUTOBOOT
109 };
110 static const smallint signals[] = { SIGUSR1, SIGUSR2, SIGTERM };
111
112 int delay = 0;
113 int which, flags, rc;
114
115 /* Figure out which applet we're running */
116 for (which = 0; "hpr"[which] != applet_name[0]; which++)
117 continue;
118
119 /* Parse and handle arguments */
120 opt_complementary = "d+"; /* -d N */
121 /* We support -w even if !ENABLE_FEATURE_WTMP,
122 * in order to not break scripts.
123 * -i (shut down network interfaces) is ignored.
124 */
125 flags = getopt32(argv, "d:nfwi", &delay);
126
127 sleep(delay);
128
129 write_wtmp();
130
131 if (flags & 8) /* -w */
132 return EXIT_SUCCESS;
133
134 if (!(flags & 2)) /* no -n */
135 sync();
136
137#ifdef __BIONIC__
138 char *mode[4];
139 int c = 1;
140 mode[0] = strdup("reboot");
141 mode[1] = mode[2] = mode[3] = NULL;
142 switch (which) {
143 case 0:
144 case 1:
145 //-p for halt
146 mode[1] = strdup("-p");
147 c=2;
148 break;
149 case 2:
150 //reboot
151 #ifdef CYANOGEN_LIBREBOOT
152 if (argc > 1) {
153 mode[1] = strdup(argv[1]);
154 c = 2;
155 }
156 #endif
157 break;
158 }
159 return reboot_main(c, mode);
160#endif
161
162 /* Perform action. */
163 rc = 1;
164 if (!(flags & 4)) { /* no -f */
165//TODO: I tend to think that signalling linuxrc is wrong
166// pity original author didn't comment on it...
167 if (ENABLE_FEATURE_INITRD) {
168 /* talk to linuxrc */
169 /* bbox init/linuxrc assumed */
170 pid_t *pidlist = find_pid_by_name("linuxrc");
171 if (pidlist[0] > 0)
172 rc = kill(pidlist[0], signals[which]);
173 if (ENABLE_FEATURE_CLEAN_UP)
174 free(pidlist);
175 }
176 if (rc) {
177 /* talk to init */
178 if (!ENABLE_FEATURE_CALL_TELINIT) {
179 /* bbox init assumed */
180 rc = kill(1, signals[which]);
181 } else {
182 /* SysV style init assumed */
183 /* runlevels:
184 * 0 == shutdown
185 * 6 == reboot */
186 execlp(CONFIG_TELINIT_PATH,
187 CONFIG_TELINIT_PATH,
188 which == 2 ? "6" : "0",
189 (char *)NULL
190 );
191 bb_perror_msg_and_die("can't execute '%s'",
192 CONFIG_TELINIT_PATH);
193 }
194 }
195 } else {
196 rc = reboot(magic[which]);
197 }
198
199 if (rc)
200 bb_perror_nomsg_and_die();
201 return rc;
202}
203
generated by cgit at 2024-05-15 02:57:03 (GMT)