source: branches/3.2/mindi-busybox/init/halt.c @ 3232

Last change on this file since 3232 was 3232, checked in by Bruno Cornec, 7 years ago
  • Update mindi-busybox to 1.21.1
File size: 4.8 KB
Line 
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#if ENABLE_FEATURE_WTMP
73#include <sys/utsname.h>
74
75static void write_wtmp(void)
76{
77    struct utmp utmp;
78    struct utsname uts;
79    /* "man utmp" says wtmp file should *not* be created automagically */
80    /*if (access(bb_path_wtmp_file, R_OK|W_OK) == -1) {
81        close(creat(bb_path_wtmp_file, 0664));
82    }*/
83    memset(&utmp, 0, sizeof(utmp));
84    utmp.ut_tv.tv_sec = time(NULL);
85    strcpy(utmp.ut_user, "shutdown"); /* it is wide enough */
86    utmp.ut_type = RUN_LVL;
87    utmp.ut_id[0] = '~'; utmp.ut_id[1] = '~'; /* = strcpy(utmp.ut_id, "~~"); */
88    utmp.ut_line[0] = '~'; utmp.ut_line[1] = '~'; /* = strcpy(utmp.ut_line, "~~"); */
89    uname(&uts);
90    safe_strncpy(utmp.ut_host, uts.release, sizeof(utmp.ut_host));
91    updwtmp(bb_path_wtmp_file, &utmp);
92}
93#else
94#define write_wtmp() ((void)0)
95#endif
96
97
98int halt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
99int halt_main(int argc UNUSED_PARAM, char **argv)
100{
101    static const int magic[] = {
102        RB_HALT_SYSTEM,
103        RB_POWER_OFF,
104        RB_AUTOBOOT
105    };
106    static const smallint signals[] = { SIGUSR1, SIGUSR2, SIGTERM };
107
108    int delay = 0;
109    int which, flags, rc;
110
111    /* Figure out which applet we're running */
112    for (which = 0; "hpr"[which] != applet_name[0]; which++)
113        continue;
114
115    /* Parse and handle arguments */
116    opt_complementary = "d+"; /* -d N */
117    /* We support -w even if !ENABLE_FEATURE_WTMP,
118     * in order to not break scripts.
119     * -i (shut down network interfaces) is ignored.
120     */
121    flags = getopt32(argv, "d:nfwi", &delay);
122
123    sleep(delay);
124
125    write_wtmp();
126
127    if (flags & 8) /* -w */
128        return EXIT_SUCCESS;
129
130    if (!(flags & 2)) /* no -n */
131        sync();
132
133    /* Perform action. */
134    rc = 1;
135    if (!(flags & 4)) { /* no -f */
136//TODO: I tend to think that signalling linuxrc is wrong
137// pity original author didn't comment on it...
138        if (ENABLE_FEATURE_INITRD) {
139            /* talk to linuxrc */
140            /* bbox init/linuxrc assumed */
141            pid_t *pidlist = find_pid_by_name("linuxrc");
142            if (pidlist[0] > 0)
143                rc = kill(pidlist[0], signals[which]);
144            if (ENABLE_FEATURE_CLEAN_UP)
145                free(pidlist);
146        }
147        if (rc) {
148            /* talk to init */
149            if (!ENABLE_FEATURE_CALL_TELINIT) {
150                /* bbox init assumed */
151                rc = kill(1, signals[which]);
152            } else {
153                /* SysV style init assumed */
154                /* runlevels:
155                 * 0 == shutdown
156                 * 6 == reboot */
157                execlp(CONFIG_TELINIT_PATH,
158                        CONFIG_TELINIT_PATH,
159                        which == 2 ? "6" : "0",
160                        (char *)NULL
161                );
162                bb_perror_msg_and_die("can't execute '%s'",
163                        CONFIG_TELINIT_PATH);
164            }
165        }
166    } else {
167        rc = reboot(magic[which]);
168    }
169
170    if (rc)
171        bb_perror_nomsg_and_die();
172    return rc;
173}
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