Contents of /tags/mkinitrd-6_2_2/busybox/init/halt.c
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Sun May 30 12:28:42 2010 UTC (14 years, 4 months ago) by niro
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Sun May 30 12:28:42 2010 UTC (14 years, 4 months ago) by niro
File MIME type: text/plain
File size: 2837 byte(s)
tagged 'mkinitrd-6_2_2'
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 GPL version 2, see file LICENSE in this tarball for details. |
8 | */ |
9 | |
10 | #include "libbb.h" |
11 | #include <sys/reboot.h> |
12 | |
13 | #if ENABLE_FEATURE_WTMP |
14 | #include <sys/utsname.h> |
15 | #include <utmp.h> |
16 | |
17 | static void write_wtmp(void) |
18 | { |
19 | struct utmp utmp; |
20 | struct utsname uts; |
21 | if (access(bb_path_wtmp_file, R_OK|W_OK) == -1) { |
22 | close(creat(bb_path_wtmp_file, 0664)); |
23 | } |
24 | memset(&utmp, 0, sizeof(utmp)); |
25 | utmp.ut_tv.tv_sec = time(NULL); |
26 | safe_strncpy(utmp.ut_user, "shutdown", UT_NAMESIZE); |
27 | utmp.ut_type = RUN_LVL; |
28 | safe_strncpy(utmp.ut_id, "~~", sizeof(utmp.ut_id)); |
29 | safe_strncpy(utmp.ut_line, "~~", UT_LINESIZE); |
30 | if (uname(&uts) == 0) |
31 | safe_strncpy(utmp.ut_host, uts.release, sizeof(utmp.ut_host)); |
32 | updwtmp(bb_path_wtmp_file, &utmp); |
33 | |
34 | } |
35 | #else |
36 | #define write_wtmp() ((void)0) |
37 | #endif |
38 | |
39 | #ifndef RB_HALT_SYSTEM |
40 | #define RB_HALT_SYSTEM RB_HALT |
41 | #endif |
42 | |
43 | #ifndef RB_POWERDOWN |
44 | /* Stop system and switch power off if possible. */ |
45 | # define RB_POWERDOWN 0x4321fedc |
46 | #endif |
47 | #ifndef RB_POWER_OFF |
48 | # define RB_POWER_OFF RB_POWERDOWN |
49 | #endif |
50 | |
51 | |
52 | int halt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
53 | int halt_main(int argc UNUSED_PARAM, char **argv) |
54 | { |
55 | static const int magic[] = { |
56 | RB_HALT_SYSTEM, |
57 | RB_POWER_OFF, |
58 | RB_AUTOBOOT |
59 | }; |
60 | static const smallint signals[] = { SIGUSR1, SIGUSR2, SIGTERM }; |
61 | |
62 | int delay = 0; |
63 | int which, flags, rc; |
64 | |
65 | /* Figure out which applet we're running */ |
66 | for (which = 0; "hpr"[which] != applet_name[0]; which++) |
67 | continue; |
68 | |
69 | /* Parse and handle arguments */ |
70 | opt_complementary = "d+"; /* -d N */ |
71 | /* We support -w even if !ENABLE_FEATURE_WTMP, |
72 | * in order to not break scripts. |
73 | * -i (shut down network interfaces) is ignored. |
74 | */ |
75 | flags = getopt32(argv, "d:nfwi", &delay); |
76 | |
77 | sleep(delay); |
78 | |
79 | write_wtmp(); |
80 | |
81 | if (flags & 8) /* -w */ |
82 | return EXIT_SUCCESS; |
83 | |
84 | if (!(flags & 2)) /* no -n */ |
85 | sync(); |
86 | |
87 | /* Perform action. */ |
88 | rc = 1; |
89 | if (!(flags & 4)) { /* no -f */ |
90 | //TODO: I tend to think that signalling linuxrc is wrong |
91 | // pity original author didn't comment on it... |
92 | if (ENABLE_FEATURE_INITRD) { |
93 | /* talk to linuxrc */ |
94 | /* bbox init/linuxrc assumed */ |
95 | pid_t *pidlist = find_pid_by_name("linuxrc"); |
96 | if (pidlist[0] > 0) |
97 | rc = kill(pidlist[0], signals[which]); |
98 | if (ENABLE_FEATURE_CLEAN_UP) |
99 | free(pidlist); |
100 | } |
101 | if (rc) { |
102 | /* talk to init */ |
103 | if (!ENABLE_FEATURE_CALL_TELINIT) { |
104 | /* bbox init assumed */ |
105 | rc = kill(1, signals[which]); |
106 | } else { |
107 | /* SysV style init assumed */ |
108 | /* runlevels: |
109 | * 0 == shutdown |
110 | * 6 == reboot */ |
111 | rc = execlp(CONFIG_TELINIT_PATH, |
112 | CONFIG_TELINIT_PATH, |
113 | which == 2 ? "6" : "0", |
114 | (char *)NULL |
115 | ); |
116 | } |
117 | } |
118 | } else { |
119 | rc = reboot(magic[which]); |
120 | } |
121 | |
122 | if (rc) |
123 | bb_perror_nomsg_and_die(); |
124 | return rc; |
125 | } |