Mercurial > hg > toybox
annotate toys/oneit.c @ 234:163498bf547b
Move NEWTOY() list from end of toylist.h to generated/newtoys.h.
| author | Rob Landley <rob@landley.net> |
|---|---|
| date | Sat, 19 Jan 2008 17:43:27 -0600 |
| parents | d4176f3f3835 |
| children | 7cb15eae1664 |
| rev | line source |
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1 /* vi: set sw=4 ts=4: |
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2 * |
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3 * oneit.c, tiny one-process init replacement. |
| 34 | 4 * |
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5 * Copyright 2005, 2007 by Rob Landley <rob@landley.net>. |
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6 * |
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7 * Not in SUSv3. |
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8 |
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9 USE_ONEIT(NEWTOY(oneit, "+<1c:p", TOYFLAG_SBIN)) |
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10 |
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11 config ONEIT |
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12 bool "oneit" |
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13 default y |
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14 help |
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15 usage: oneit [-p] [-c /dev/tty0] command [...] |
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16 |
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17 A simple init program that runs a single supplied command line with a |
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18 controlling tty (so CTRL-C can kill it). |
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19 |
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20 -p Power off instead of rebooting when command exits. |
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21 -c Which console device to use. |
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22 |
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23 The oneit command runs the supplied command line as a child process |
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24 (because PID 1 has signals blocked), attached to /dev/tty0, in its |
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25 own session. Then oneit reaps zombies until the child exits, at |
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26 which point it reboots (or with -p, powers off) the system. |
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27 */ |
| 34 | 28 |
| 29 #include "toys.h" | |
| 30 #include <sys/reboot.h> | |
| 31 | |
| 32 // The minimum amount of work necessary to get ctrl-c and such to work is: | |
| 33 // | |
| 34 // - Fork a child (PID 1 is special: can't exit, has various signals blocked). | |
| 35 // - Do a setsid() (so we have our own session). | |
| 36 // - In the child, attach stdio to /dev/tty0 (/dev/console is special) | |
| 37 // - Exec the rest of the command line. | |
| 38 // | |
| 39 // PID 1 then reaps zombies until the child process it spawned exits, at which | |
| 40 // point it calls sync() and reboot(). I could stick a kill -1 in there. | |
| 41 | |
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42 #define TT toy.oneit |
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43 |
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44 void oneit_main(void) |
| 34 | 45 { |
| 46 int i; | |
| 47 pid_t pid; | |
| 48 | |
| 49 // Create a new child process. | |
| 50 pid = vfork(); | |
| 51 if (pid) { | |
| 52 | |
| 53 // pid 1 just reaps zombies until it gets its child, then halts the system. | |
| 54 while (pid!=wait(&i)); | |
| 55 sync(); | |
| 56 reboot(toys.optflags ? RB_POWER_OFF : RB_AUTOBOOT); | |
| 57 } | |
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58 |
| 34 | 59 // Redirect stdio to /dev/tty0, with new session ID, so ctrl-c works. |
| 60 setsid(); | |
| 61 for (i=0; i<3; i++) { | |
| 62 close(i); | |
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63 xopen(TT.console ? TT.console : "/dev/tty0",O_RDWR); |
| 34 | 64 } |
| 65 | |
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66 // Can't xexec() here, because we vforked so we don't want to error_exit(). |
| 34 | 67 toy_exec(toys.optargs); |
| 68 execvp(*toys.optargs, toys.optargs); | |
| 69 _exit(127); | |
| 70 } |