1 /* vi: set sw=4 ts=4: */
3 * Poweroff reboot and halt, oh my.
5 * Copyright 2006 by Rob Landley <rob@landley.net>
7 * Licensed under GPLv2, see file LICENSE in this source tree.
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))
14 //kbuild:lib-$(CONFIG_HALT) += halt.o
17 //config: bool "poweroff, halt, and reboot"
20 //config: Stop all processes and either halt, reboot, or power off the system.
22 //config:config FEATURE_CALL_TELINIT
23 //config: bool "Call telinit on shutdown and reboot"
25 //config: depends on HALT && !INIT
27 //config: Call an external program (normally telinit) to facilitate
28 //config: a switch to a proper runlevel.
30 //config: This option is only available if you selected halt and friends,
31 //config: but did not select init.
33 //config:config TELINIT_PATH
34 //config: string "Path to telinit executable"
35 //config: default "/sbin/telinit"
36 //config: depends on FEATURE_CALL_TELINIT
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.
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"
47 //usage: "\n -d SEC Delay interval"
48 //usage: "\n -n Do not sync"
49 //usage: "\n -f Force (don't go through init)"
50 //usage: IF_FEATURE_WTMP(
51 //usage: "\n -w Only write a wtmp record"
54 //usage:#define poweroff_trivial_usage
55 //usage: "[-d DELAY] [-n] [-f]"
56 //usage:#define poweroff_full_usage "\n\n"
57 //usage: "Halt and shut off power\n"
59 //usage: "\n -d SEC Delay interval"
60 //usage: "\n -n Do not sync"
61 //usage: "\n -f Force (don't go through init)"
63 //usage:#define reboot_trivial_usage
64 //usage: "[-d DELAY] [-n] [-f]"
65 //usage:#define reboot_full_usage "\n\n"
66 //usage: "Reboot the system\n"
68 //usage: "\n -d SEC Delay interval"
69 //usage: "\n -n Do not sync"
70 //usage: "\n -f Force (don't go through init)"
75 #if ENABLE_FEATURE_WTMP
76 #include <sys/utsname.h>
78 static void write_wtmp(void)
82 /* "man utmp" says wtmp file should *not* be created automagically */
83 /*if (access(bb_path_wtmp_file, R_OK|W_OK) == -1) {
84 close(creat(bb_path_wtmp_file, 0664));
86 memset(&utmp, 0, sizeof(utmp));
87 utmp.ut_tv.tv_sec = time(NULL);
88 strcpy(utmp.ut_user, "shutdown"); /* it is wide enough */
89 utmp.ut_type = RUN_LVL;
90 utmp.ut_id[0] = '~'; utmp.ut_id[1] = '~'; /* = strcpy(utmp.ut_id, "~~"); */
91 utmp.ut_line[0] = '~'; utmp.ut_line[1] = '~'; /* = strcpy(utmp.ut_line, "~~"); */
93 safe_strncpy(utmp.ut_host, uts.release, sizeof(utmp.ut_host));
94 updwtmp(bb_path_wtmp_file, &utmp);
97 #define write_wtmp() ((void)0)
101 int halt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
102 int halt_main(int argc UNUSED_PARAM, char **argv)
104 static const int magic[] = {
109 static const smallint signals[] = { SIGUSR1, SIGUSR2, SIGTERM };
112 int which, flags, rc;
114 /* Figure out which applet we're running */
115 for (which = 0; "hpr"[which] != applet_name[0]; which++)
118 /* Parse and handle arguments */
119 opt_complementary = "d+"; /* -d N */
120 /* We support -w even if !ENABLE_FEATURE_WTMP,
121 * in order to not break scripts.
122 * -i (shut down network interfaces) is ignored.
124 flags = getopt32(argv, "d:nfwi", &delay);
130 if (flags & 8) /* -w */
133 if (!(flags & 2)) /* no -n */
136 /* Perform action. */
138 if (!(flags & 4)) { /* no -f */
139 //TODO: I tend to think that signalling linuxrc is wrong
140 // pity original author didn't comment on it...
141 if (ENABLE_FEATURE_INITRD) {
142 /* talk to linuxrc */
143 /* bbox init/linuxrc assumed */
144 pid_t *pidlist = find_pid_by_name("linuxrc");
146 rc = kill(pidlist[0], signals[which]);
147 if (ENABLE_FEATURE_CLEAN_UP)
152 if (!ENABLE_FEATURE_CALL_TELINIT) {
153 /* bbox init assumed */
154 rc = kill(1, signals[which]);
156 /* SysV style init assumed */
160 rc = execlp(CONFIG_TELINIT_PATH,
162 which == 2 ? "6" : "0",
168 rc = reboot(magic[which]);
172 bb_perror_nomsg_and_die();