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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 | /* vi: set sw=4 ts=4: */ /* * Poweroff reboot and halt, oh my. * * Copyright 2006 by Rob Landley <rob@landley.net> * * Licensed under GPLv2, see file LICENSE in this source tree. */ //config:config HALT //config: bool "halt (4 kb)" //config: default y //config: help //config: Stop all processes and halt the system. //config: //config:config POWEROFF //config: bool "poweroff (4 kb)" //config: default y //config: help //config: Stop all processes and power off the system. //config: //config:config REBOOT //config: bool "reboot (4 kb)" //config: default y //config: help //config: Stop all processes and reboot the system. //config: //config:config FEATURE_WAIT_FOR_INIT //config: bool "Before signaling init, make sure it is ready for it" //config: default y //config: depends on HALT || POWEROFF || REBOOT //config: help //config: In rare cases, poweroff may be commanded by firmware to OS //config: even before init process exists. On Linux, this spawns //config: "/sbin/poweroff" very early. This option adds code //config: which checks that init is ready to receive poweroff //config: commands. Code size increase of ~80 bytes. //config: //config:config FEATURE_CALL_TELINIT //config: bool "Call telinit on shutdown and reboot" //config: default y //config: depends on (HALT || POWEROFF || REBOOT) && !INIT //config: help //config: Call an external program (normally telinit) to facilitate //config: a switch to a proper runlevel. //config: //config: This option is only available if you selected halt and friends, //config: but did not select init. //config: //config:config TELINIT_PATH //config: string "Path to telinit executable" //config: default "/sbin/telinit" //config: depends on FEATURE_CALL_TELINIT //config: help //config: When busybox halt and friends have to call external telinit //config: to facilitate proper shutdown, this path is to be used when //config: locating telinit executable. //applet:IF_HALT(APPLET(halt, BB_DIR_SBIN, BB_SUID_DROP)) // APPLET_ODDNAME:name main location suid_type help //applet:IF_POWEROFF(APPLET_ODDNAME(poweroff, halt, BB_DIR_SBIN, BB_SUID_DROP, poweroff)) //applet:IF_REBOOT( APPLET_ODDNAME(reboot, halt, BB_DIR_SBIN, BB_SUID_DROP, reboot)) //kbuild:lib-$(CONFIG_HALT) += halt.o //kbuild:lib-$(CONFIG_POWEROFF) += halt.o //kbuild:lib-$(CONFIG_REBOOT) += halt.o //usage:#define halt_trivial_usage //usage: "[-d DELAY] [-n] [-f]" IF_FEATURE_WTMP(" [-w]") //usage:#define halt_full_usage "\n\n" //usage: "Halt the system\n" //usage: "\n -d SEC Delay interval" //usage: "\n -n Do not sync" //usage: "\n -f Force (don't go through init)" //usage: IF_FEATURE_WTMP( //usage: "\n -w Only write a wtmp record" //usage: ) //usage: //usage:#define poweroff_trivial_usage //usage: "[-d DELAY] [-n] [-f]" //usage:#define poweroff_full_usage "\n\n" //usage: "Halt and shut off power\n" //usage: "\n -d SEC Delay interval" //usage: "\n -n Do not sync" //usage: "\n -f Force (don't go through init)" //usage: //usage:#define reboot_trivial_usage //usage: "[-d DELAY] [-n] [-f]" //usage:#define reboot_full_usage "\n\n" //usage: "Reboot the system\n" //usage: "\n -d SEC Delay interval" //usage: "\n -n Do not sync" //usage: "\n -f Force (don't go through init)" #include "libbb.h" #include "reboot.h" #if ENABLE_FEATURE_WTMP #include <sys/utsname.h> static void write_wtmp(void) { struct utmpx utmp; struct utsname uts; /* "man utmp" says wtmp file should *not* be created automagically */ /*if (access(bb_path_wtmp_file, R_OK|W_OK) == -1) { close(creat(bb_path_wtmp_file, 0664)); }*/ memset(&utmp, 0, sizeof(utmp)); utmp.ut_tv.tv_sec = time(NULL); strcpy(utmp.ut_user, "shutdown"); /* it is wide enough */ utmp.ut_type = RUN_LVL; utmp.ut_id[0] = '~'; utmp.ut_id[1] = '~'; /* = strcpy(utmp.ut_id, "~~"); */ utmp.ut_line[0] = '~'; utmp.ut_line[1] = '~'; /* = strcpy(utmp.ut_line, "~~"); */ uname(&uts); safe_strncpy(utmp.ut_host, uts.release, sizeof(utmp.ut_host)); updwtmpx(bb_path_wtmp_file, &utmp); } #else #define write_wtmp() ((void)0) #endif #if ENABLE_FEATURE_WAIT_FOR_INIT /* In Linux, "poweroff" may be spawned even before init. * For example, with ACPI: * linux/drivers/acpi/bus.c: * static void sb_notify_work(struct work_struct *dummy) * orderly_poweroff(true); * linux/kernel/reboot.c: * static int run_cmd(const char *cmd) * ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC); * poweroff_cmd[] = "/sbin/poweroff"; * static int __orderly_poweroff(bool force) * ret = run_cmd(poweroff_cmd); * * We want to make sure init exists and listens to signals. */ static int init_was_not_there(void) { enum { initial = 5 }; /* 5 seconds should be plenty for timeout */ int cnt = initial - 1; /* Just existence of PID 1 does not mean it installed * the handlers already. */ #if 0 while (kill(1, 0) != 0 && --cnt >= 0) sleep(1); #endif /* ... so let's wait for some evidence a usual startup event, * mounting of /proc, happened. By that time init should be ready * for signals. */ while (access("/proc/meminfo", F_OK) != 0 && --cnt >= 0) sleep(1); /* Does it look like init wasn't there? */ return (cnt != initial - 1); } #else /* Assume it's always there */ # define init_was_not_there() 0 #endif int halt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int halt_main(int argc UNUSED_PARAM, char **argv) { static const int magic[] = { RB_HALT_SYSTEM, RB_POWER_OFF, RB_AUTOBOOT }; static const smallint signals[] = { SIGUSR1, SIGUSR2, SIGTERM }; int delay = 0; int which, flags, rc; /* Figure out which applet we're running */ if (ENABLE_HALT && !ENABLE_POWEROFF && !ENABLE_REBOOT) which = 0; else if (!ENABLE_HALT && ENABLE_POWEROFF && !ENABLE_REBOOT) which = 1; else if (!ENABLE_HALT && !ENABLE_POWEROFF && ENABLE_REBOOT) which = 2; else for (which = 0; "hpr"[which] != applet_name[0]; which++) continue; /* Parse and handle arguments */ /* We support -w even if !ENABLE_FEATURE_WTMP, * in order to not break scripts. * -i (shut down network interfaces) is ignored. */ flags = getopt32(argv, "d:+nfwi", &delay); sleep(delay); write_wtmp(); if (flags & 8) /* -w */ return EXIT_SUCCESS; if (!(flags & 2)) /* no -n */ sync(); /* Perform action. */ rc = 1; if (!(flags & 4)) { /* no -f */ //TODO: I tend to think that signalling linuxrc is wrong // pity original author didn't comment on it... if (ENABLE_LINUXRC) { /* talk to linuxrc */ /* bbox init/linuxrc assumed */ pid_t *pidlist = find_pid_by_name("linuxrc"); if (pidlist[0] > 0) rc = kill(pidlist[0], signals[which]); if (ENABLE_FEATURE_CLEAN_UP) free(pidlist); } if (rc) { /* talk to init */ if (!ENABLE_FEATURE_CALL_TELINIT) { /* bbox init assumed */ rc = kill(1, signals[which]); if (init_was_not_there()) rc = kill(1, signals[which]); } else { /* SysV style init assumed */ /* runlevels: * 0 == shutdown * 6 == reboot */ execlp(CONFIG_TELINIT_PATH, CONFIG_TELINIT_PATH, which == 2 ? "6" : "0", (char *)NULL ); bb_perror_msg_and_die("can't execute '%s'", CONFIG_TELINIT_PATH); } } } else { rc = reboot(magic[which]); } if (rc) bb_perror_nomsg_and_die(); return rc; } |