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| author | Denys Vlasenko <vda.linux@googlemail.com> | 2010-11-02 20:13:03 +0100 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2010-11-02 20:13:03 +0100 |
| commit | db5fe62b6d9977304b864f961dae71232091b26c (patch) | |
| tree | e69e9efc17a3b0feae78118eb14d653cfa47e259 /init | |
| parent | 4d4d1a015f351816982e61a7f7dc861bfe06ca78 (diff) | |
| download | busybox-w32-db5fe62b6d9977304b864f961dae71232091b26c.tar.gz busybox-w32-db5fe62b6d9977304b864f961dae71232091b26c.tar.bz2 busybox-w32-db5fe62b6d9977304b864f961dae71232091b26c.zip | |
init: if PID!=1, show clearer error message. move usage text closer to main()
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'init')
| -rw-r--r-- | init/init.c | 271 |
1 files changed, 137 insertions, 134 deletions
diff --git a/init/init.c b/init/init.c index a7bbd5e64..0a0d503b5 100644 --- a/init/init.c +++ b/init/init.c | |||
| @@ -108,138 +108,6 @@ | |||
| 108 | //config: Note that on Linux, init attempts to detect serial terminal and | 108 | //config: Note that on Linux, init attempts to detect serial terminal and |
| 109 | //config: sets TERM to "vt102" if one is found. | 109 | //config: sets TERM to "vt102" if one is found. |
| 110 | 110 | ||
| 111 | //usage:#define init_trivial_usage | ||
| 112 | //usage: "" | ||
| 113 | //usage:#define init_full_usage "\n\n" | ||
| 114 | //usage: "Init is the parent of all processes" | ||
| 115 | //usage: | ||
| 116 | //usage:#define init_notes_usage | ||
| 117 | //usage: "This version of init is designed to be run only by the kernel.\n" | ||
| 118 | //usage: "\n" | ||
| 119 | //usage: "BusyBox init doesn't support multiple runlevels. The runlevels field of\n" | ||
| 120 | //usage: "the /etc/inittab file is completely ignored by BusyBox init. If you want\n" | ||
| 121 | //usage: "runlevels, use sysvinit.\n" | ||
| 122 | //usage: "\n" | ||
| 123 | //usage: "BusyBox init works just fine without an inittab. If no inittab is found,\n" | ||
| 124 | //usage: "it has the following default behavior:\n" | ||
| 125 | //usage: "\n" | ||
| 126 | //usage: " ::sysinit:/etc/init.d/rcS\n" | ||
| 127 | //usage: " ::askfirst:/bin/sh\n" | ||
| 128 | //usage: " ::ctrlaltdel:/sbin/reboot\n" | ||
| 129 | //usage: " ::shutdown:/sbin/swapoff -a\n" | ||
| 130 | //usage: " ::shutdown:/bin/umount -a -r\n" | ||
| 131 | //usage: " ::restart:/sbin/init\n" | ||
| 132 | //usage: "\n" | ||
| 133 | //usage: "if it detects that /dev/console is _not_ a serial console, it will also run:\n" | ||
| 134 | //usage: "\n" | ||
| 135 | //usage: " tty2::askfirst:/bin/sh\n" | ||
| 136 | //usage: " tty3::askfirst:/bin/sh\n" | ||
| 137 | //usage: " tty4::askfirst:/bin/sh\n" | ||
| 138 | //usage: "\n" | ||
| 139 | //usage: "If you choose to use an /etc/inittab file, the inittab entry format is as follows:\n" | ||
| 140 | //usage: "\n" | ||
| 141 | //usage: " <id>:<runlevels>:<action>:<process>\n" | ||
| 142 | //usage: "\n" | ||
| 143 | //usage: " <id>:\n" | ||
| 144 | //usage: "\n" | ||
| 145 | //usage: " WARNING: This field has a non-traditional meaning for BusyBox init!\n" | ||
| 146 | //usage: " The id field is used by BusyBox init to specify the controlling tty for\n" | ||
| 147 | //usage: " the specified process to run on. The contents of this field are\n" | ||
| 148 | //usage: " appended to \"/dev/\" and used as-is. There is no need for this field to\n" | ||
| 149 | //usage: " be unique, although if it isn't you may have strange results. If this\n" | ||
| 150 | //usage: " field is left blank, the controlling tty is set to the console. Also\n" | ||
| 151 | //usage: " note that if BusyBox detects that a serial console is in use, then only\n" | ||
| 152 | //usage: " entries whose controlling tty is either the serial console or /dev/null\n" | ||
| 153 | //usage: " will be run. BusyBox init does nothing with utmp. We don't need no\n" | ||
| 154 | //usage: " stinkin' utmp.\n" | ||
| 155 | //usage: "\n" | ||
| 156 | //usage: " <runlevels>:\n" | ||
| 157 | //usage: "\n" | ||
| 158 | //usage: " The runlevels field is completely ignored.\n" | ||
| 159 | //usage: "\n" | ||
| 160 | //usage: " <action>:\n" | ||
| 161 | //usage: "\n" | ||
| 162 | //usage: " Valid actions include: sysinit, respawn, askfirst, wait,\n" | ||
| 163 | //usage: " once, restart, ctrlaltdel, and shutdown.\n" | ||
| 164 | //usage: "\n" | ||
| 165 | //usage: " The available actions can be classified into two groups: actions\n" | ||
| 166 | //usage: " that are run only once, and actions that are re-run when the specified\n" | ||
| 167 | //usage: " process exits.\n" | ||
| 168 | //usage: "\n" | ||
| 169 | //usage: " Run only-once actions:\n" | ||
| 170 | //usage: "\n" | ||
| 171 | //usage: " 'sysinit' is the first item run on boot. init waits until all\n" | ||
| 172 | //usage: " sysinit actions are completed before continuing. Following the\n" | ||
| 173 | //usage: " completion of all sysinit actions, all 'wait' actions are run.\n" | ||
| 174 | //usage: " 'wait' actions, like 'sysinit' actions, cause init to wait until\n" | ||
| 175 | //usage: " the specified task completes. 'once' actions are asynchronous,\n" | ||
| 176 | //usage: " therefore, init does not wait for them to complete. 'restart' is\n" | ||
| 177 | //usage: " the action taken to restart the init process. By default this should\n" | ||
| 178 | //usage: " simply run /sbin/init, but can be a script which runs pivot_root or it\n" | ||
| 179 | //usage: " can do all sorts of other interesting things. The 'ctrlaltdel' init\n" | ||
| 180 | //usage: " actions are run when the system detects that someone on the system\n" | ||
| 181 | //usage: " console has pressed the CTRL-ALT-DEL key combination. Typically one\n" | ||
| 182 | //usage: " wants to run 'reboot' at this point to cause the system to reboot.\n" | ||
| 183 | //usage: " Finally the 'shutdown' action specifies the actions to taken when\n" | ||
| 184 | //usage: " init is told to reboot. Unmounting filesystems and disabling swap\n" | ||
| 185 | //usage: " is a very good here.\n" | ||
| 186 | //usage: "\n" | ||
| 187 | //usage: " Run repeatedly actions:\n" | ||
| 188 | //usage: "\n" | ||
| 189 | //usage: " 'respawn' actions are run after the 'once' actions. When a process\n" | ||
| 190 | //usage: " started with a 'respawn' action exits, init automatically restarts\n" | ||
| 191 | //usage: " it. Unlike sysvinit, BusyBox init does not stop processes from\n" | ||
| 192 | //usage: " respawning out of control. The 'askfirst' actions acts just like\n" | ||
| 193 | //usage: " respawn, except that before running the specified process it\n" | ||
| 194 | //usage: " displays the line \"Please press Enter to activate this console.\"\n" | ||
| 195 | //usage: " and then waits for the user to press enter before starting the\n" | ||
| 196 | //usage: " specified process.\n" | ||
| 197 | //usage: "\n" | ||
| 198 | //usage: " Unrecognized actions (like initdefault) will cause init to emit an\n" | ||
| 199 | //usage: " error message, and then go along with its business. All actions are\n" | ||
| 200 | //usage: " run in the order they appear in /etc/inittab.\n" | ||
| 201 | //usage: "\n" | ||
| 202 | //usage: " <process>:\n" | ||
| 203 | //usage: "\n" | ||
| 204 | //usage: " Specifies the process to be executed and its command line.\n" | ||
| 205 | //usage: "\n" | ||
| 206 | //usage: "Example /etc/inittab file:\n" | ||
| 207 | //usage: "\n" | ||
| 208 | //usage: " # This is run first except when booting in single-user mode\n" | ||
| 209 | //usage: " #\n" | ||
| 210 | //usage: " ::sysinit:/etc/init.d/rcS\n" | ||
| 211 | //usage: " \n" | ||
| 212 | //usage: " # /bin/sh invocations on selected ttys\n" | ||
| 213 | //usage: " #\n" | ||
| 214 | //usage: " # Start an \"askfirst\" shell on the console (whatever that may be)\n" | ||
| 215 | //usage: " ::askfirst:-/bin/sh\n" | ||
| 216 | //usage: " # Start an \"askfirst\" shell on /dev/tty2-4\n" | ||
| 217 | //usage: " tty2::askfirst:-/bin/sh\n" | ||
| 218 | //usage: " tty3::askfirst:-/bin/sh\n" | ||
| 219 | //usage: " tty4::askfirst:-/bin/sh\n" | ||
| 220 | //usage: " \n" | ||
| 221 | //usage: " # /sbin/getty invocations for selected ttys\n" | ||
| 222 | //usage: " #\n" | ||
| 223 | //usage: " tty4::respawn:/sbin/getty 38400 tty4\n" | ||
| 224 | //usage: " tty5::respawn:/sbin/getty 38400 tty5\n" | ||
| 225 | //usage: " \n" | ||
| 226 | //usage: " \n" | ||
| 227 | //usage: " # Example of how to put a getty on a serial line (for a terminal)\n" | ||
| 228 | //usage: " #\n" | ||
| 229 | //usage: " #::respawn:/sbin/getty -L ttyS0 9600 vt100\n" | ||
| 230 | //usage: " #::respawn:/sbin/getty -L ttyS1 9600 vt100\n" | ||
| 231 | //usage: " #\n" | ||
| 232 | //usage: " # Example how to put a getty on a modem line\n" | ||
| 233 | //usage: " #::respawn:/sbin/getty 57600 ttyS2\n" | ||
| 234 | //usage: " \n" | ||
| 235 | //usage: " # Stuff to do when restarting the init process\n" | ||
| 236 | //usage: " ::restart:/sbin/init\n" | ||
| 237 | //usage: " \n" | ||
| 238 | //usage: " # Stuff to do before rebooting\n" | ||
| 239 | //usage: " ::ctrlaltdel:/sbin/reboot\n" | ||
| 240 | //usage: " ::shutdown:/bin/umount -a -r\n" | ||
| 241 | //usage: " ::shutdown:/sbin/swapoff -a\n" | ||
| 242 | |||
| 243 | #include "libbb.h" | 111 | #include "libbb.h" |
| 244 | #include <syslog.h> | 112 | #include <syslog.h> |
| 245 | #include <paths.h> | 113 | #include <paths.h> |
| @@ -1095,9 +963,9 @@ int init_main(int argc UNUSED_PARAM, char **argv) | |||
| 1095 | if (!DEBUG_INIT) { | 963 | if (!DEBUG_INIT) { |
| 1096 | /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */ | 964 | /* Expect to be invoked as init with PID=1 or be invoked as linuxrc */ |
| 1097 | if (getpid() != 1 | 965 | if (getpid() != 1 |
| 1098 | && (!ENABLE_FEATURE_INITRD || !strstr(applet_name, "linuxrc")) | 966 | && (!ENABLE_FEATURE_INITRD || applet_name[0] != 'l') /* not linuxrc? */ |
| 1099 | ) { | 967 | ) { |
| 1100 | bb_show_usage(); | 968 | bb_error_msg_and_die("must be run as PID 1"); |
| 1101 | } | 969 | } |
| 1102 | #ifdef RB_DISABLE_CAD | 970 | #ifdef RB_DISABLE_CAD |
| 1103 | /* Turn off rebooting via CTL-ALT-DEL - we get a | 971 | /* Turn off rebooting via CTL-ALT-DEL - we get a |
| @@ -1286,3 +1154,138 @@ int init_main(int argc UNUSED_PARAM, char **argv) | |||
| 1286 | } | 1154 | } |
| 1287 | } /* while (1) */ | 1155 | } /* while (1) */ |
| 1288 | } | 1156 | } |
| 1157 | |||
| 1158 | //usage:#define linuxrc_trivial_usage NOUSAGE_STR | ||
| 1159 | //usage:#define linuxrc_full_usage "" | ||
| 1160 | |||
| 1161 | //usage:#define init_trivial_usage | ||
| 1162 | //usage: "" | ||
| 1163 | //usage:#define init_full_usage "\n\n" | ||
| 1164 | //usage: "Init is the parent of all processes" | ||
| 1165 | //usage: | ||
| 1166 | //usage:#define init_notes_usage | ||
| 1167 | //usage: "This version of init is designed to be run only by the kernel.\n" | ||
| 1168 | //usage: "\n" | ||
| 1169 | //usage: "BusyBox init doesn't support multiple runlevels. The runlevels field of\n" | ||
| 1170 | //usage: "the /etc/inittab file is completely ignored by BusyBox init. If you want\n" | ||
| 1171 | //usage: "runlevels, use sysvinit.\n" | ||
| 1172 | //usage: "\n" | ||
| 1173 | //usage: "BusyBox init works just fine without an inittab. If no inittab is found,\n" | ||
| 1174 | //usage: "it has the following default behavior:\n" | ||
| 1175 | //usage: "\n" | ||
| 1176 | //usage: " ::sysinit:/etc/init.d/rcS\n" | ||
| 1177 | //usage: " ::askfirst:/bin/sh\n" | ||
| 1178 | //usage: " ::ctrlaltdel:/sbin/reboot\n" | ||
| 1179 | //usage: " ::shutdown:/sbin/swapoff -a\n" | ||
| 1180 | //usage: " ::shutdown:/bin/umount -a -r\n" | ||
| 1181 | //usage: " ::restart:/sbin/init\n" | ||
| 1182 | //usage: "\n" | ||
| 1183 | //usage: "if it detects that /dev/console is _not_ a serial console, it will also run:\n" | ||
| 1184 | //usage: "\n" | ||
| 1185 | //usage: " tty2::askfirst:/bin/sh\n" | ||
| 1186 | //usage: " tty3::askfirst:/bin/sh\n" | ||
| 1187 | //usage: " tty4::askfirst:/bin/sh\n" | ||
| 1188 | //usage: "\n" | ||
| 1189 | //usage: "If you choose to use an /etc/inittab file, the inittab entry format is as follows:\n" | ||
| 1190 | //usage: "\n" | ||
| 1191 | //usage: " <id>:<runlevels>:<action>:<process>\n" | ||
| 1192 | //usage: "\n" | ||
| 1193 | //usage: " <id>:\n" | ||
| 1194 | //usage: "\n" | ||
| 1195 | //usage: " WARNING: This field has a non-traditional meaning for BusyBox init!\n" | ||
| 1196 | //usage: " The id field is used by BusyBox init to specify the controlling tty for\n" | ||
| 1197 | //usage: " the specified process to run on. The contents of this field are\n" | ||
| 1198 | //usage: " appended to \"/dev/\" and used as-is. There is no need for this field to\n" | ||
| 1199 | //usage: " be unique, although if it isn't you may have strange results. If this\n" | ||
| 1200 | //usage: " field is left blank, the controlling tty is set to the console. Also\n" | ||
| 1201 | //usage: " note that if BusyBox detects that a serial console is in use, then only\n" | ||
| 1202 | //usage: " entries whose controlling tty is either the serial console or /dev/null\n" | ||
| 1203 | //usage: " will be run. BusyBox init does nothing with utmp. We don't need no\n" | ||
| 1204 | //usage: " stinkin' utmp.\n" | ||
| 1205 | //usage: "\n" | ||
| 1206 | //usage: " <runlevels>:\n" | ||
| 1207 | //usage: "\n" | ||
| 1208 | //usage: " The runlevels field is completely ignored.\n" | ||
| 1209 | //usage: "\n" | ||
| 1210 | //usage: " <action>:\n" | ||
| 1211 | //usage: "\n" | ||
| 1212 | //usage: " Valid actions include: sysinit, respawn, askfirst, wait,\n" | ||
| 1213 | //usage: " once, restart, ctrlaltdel, and shutdown.\n" | ||
| 1214 | //usage: "\n" | ||
| 1215 | //usage: " The available actions can be classified into two groups: actions\n" | ||
| 1216 | //usage: " that are run only once, and actions that are re-run when the specified\n" | ||
| 1217 | //usage: " process exits.\n" | ||
| 1218 | //usage: "\n" | ||
| 1219 | //usage: " Run only-once actions:\n" | ||
| 1220 | //usage: "\n" | ||
| 1221 | //usage: " 'sysinit' is the first item run on boot. init waits until all\n" | ||
| 1222 | //usage: " sysinit actions are completed before continuing. Following the\n" | ||
| 1223 | //usage: " completion of all sysinit actions, all 'wait' actions are run.\n" | ||
| 1224 | //usage: " 'wait' actions, like 'sysinit' actions, cause init to wait until\n" | ||
| 1225 | //usage: " the specified task completes. 'once' actions are asynchronous,\n" | ||
| 1226 | //usage: " therefore, init does not wait for them to complete. 'restart' is\n" | ||
| 1227 | //usage: " the action taken to restart the init process. By default this should\n" | ||
| 1228 | //usage: " simply run /sbin/init, but can be a script which runs pivot_root or it\n" | ||
| 1229 | //usage: " can do all sorts of other interesting things. The 'ctrlaltdel' init\n" | ||
| 1230 | //usage: " actions are run when the system detects that someone on the system\n" | ||
| 1231 | //usage: " console has pressed the CTRL-ALT-DEL key combination. Typically one\n" | ||
| 1232 | //usage: " wants to run 'reboot' at this point to cause the system to reboot.\n" | ||
| 1233 | //usage: " Finally the 'shutdown' action specifies the actions to taken when\n" | ||
| 1234 | //usage: " init is told to reboot. Unmounting filesystems and disabling swap\n" | ||
| 1235 | //usage: " is a very good here.\n" | ||
| 1236 | //usage: "\n" | ||
| 1237 | //usage: " Run repeatedly actions:\n" | ||
| 1238 | //usage: "\n" | ||
| 1239 | //usage: " 'respawn' actions are run after the 'once' actions. When a process\n" | ||
| 1240 | //usage: " started with a 'respawn' action exits, init automatically restarts\n" | ||
| 1241 | //usage: " it. Unlike sysvinit, BusyBox init does not stop processes from\n" | ||
| 1242 | //usage: " respawning out of control. The 'askfirst' actions acts just like\n" | ||
| 1243 | //usage: " respawn, except that before running the specified process it\n" | ||
| 1244 | //usage: " displays the line \"Please press Enter to activate this console.\"\n" | ||
| 1245 | //usage: " and then waits for the user to press enter before starting the\n" | ||
| 1246 | //usage: " specified process.\n" | ||
| 1247 | //usage: "\n" | ||
| 1248 | //usage: " Unrecognized actions (like initdefault) will cause init to emit an\n" | ||
| 1249 | //usage: " error message, and then go along with its business. All actions are\n" | ||
| 1250 | //usage: " run in the order they appear in /etc/inittab.\n" | ||
| 1251 | //usage: "\n" | ||
| 1252 | //usage: " <process>:\n" | ||
| 1253 | //usage: "\n" | ||
| 1254 | //usage: " Specifies the process to be executed and its command line.\n" | ||
| 1255 | //usage: "\n" | ||
| 1256 | //usage: "Example /etc/inittab file:\n" | ||
| 1257 | //usage: "\n" | ||
| 1258 | //usage: " # This is run first except when booting in single-user mode\n" | ||
| 1259 | //usage: " #\n" | ||
| 1260 | //usage: " ::sysinit:/etc/init.d/rcS\n" | ||
| 1261 | //usage: " \n" | ||
| 1262 | //usage: " # /bin/sh invocations on selected ttys\n" | ||
| 1263 | //usage: " #\n" | ||
| 1264 | //usage: " # Start an \"askfirst\" shell on the console (whatever that may be)\n" | ||
| 1265 | //usage: " ::askfirst:-/bin/sh\n" | ||
| 1266 | //usage: " # Start an \"askfirst\" shell on /dev/tty2-4\n" | ||
| 1267 | //usage: " tty2::askfirst:-/bin/sh\n" | ||
| 1268 | //usage: " tty3::askfirst:-/bin/sh\n" | ||
| 1269 | //usage: " tty4::askfirst:-/bin/sh\n" | ||
| 1270 | //usage: " \n" | ||
| 1271 | //usage: " # /sbin/getty invocations for selected ttys\n" | ||
| 1272 | //usage: " #\n" | ||
| 1273 | //usage: " tty4::respawn:/sbin/getty 38400 tty4\n" | ||
| 1274 | //usage: " tty5::respawn:/sbin/getty 38400 tty5\n" | ||
| 1275 | //usage: " \n" | ||
| 1276 | //usage: " \n" | ||
| 1277 | //usage: " # Example of how to put a getty on a serial line (for a terminal)\n" | ||
| 1278 | //usage: " #\n" | ||
| 1279 | //usage: " #::respawn:/sbin/getty -L ttyS0 9600 vt100\n" | ||
| 1280 | //usage: " #::respawn:/sbin/getty -L ttyS1 9600 vt100\n" | ||
| 1281 | //usage: " #\n" | ||
| 1282 | //usage: " # Example how to put a getty on a modem line\n" | ||
| 1283 | //usage: " #::respawn:/sbin/getty 57600 ttyS2\n" | ||
| 1284 | //usage: " \n" | ||
| 1285 | //usage: " # Stuff to do when restarting the init process\n" | ||
| 1286 | //usage: " ::restart:/sbin/init\n" | ||
| 1287 | //usage: " \n" | ||
| 1288 | //usage: " # Stuff to do before rebooting\n" | ||
| 1289 | //usage: " ::ctrlaltdel:/sbin/reboot\n" | ||
| 1290 | //usage: " ::shutdown:/bin/umount -a -r\n" | ||
| 1291 | //usage: " ::shutdown:/sbin/swapoff -a\n" | ||