Mercurial > hg > toybox
annotate toys/other/oneit.c @ 674:7e846e281e38
New build infrastructure to generate FLAG_ macros and TT alias, #define FOR_commandname before #including toys.h to trigger it. Rename DEFINE_GLOBALS() to just GLOBALS() (because I could never remember if it was DECLARE_GLOBALS). Convert existing commands to use new infrastructure, and replace optflag constants with FLAG_ macros where appropriate.
author | Rob Landley <rob@landley.net> |
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date | Mon, 08 Oct 2012 00:02:30 -0500 |
parents | 6df4ccc0acbe |
children | 786841fdb1e0 |
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1 /* vi: set sw=4 ts=4: |
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2 * |
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3 * oneit.c - tiny init replacement to launch a single child process. |
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 USE_ONEIT(NEWTOY(oneit, "^<1c:p", TOYFLAG_SBIN)) |
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8 |
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9 config ONEIT |
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10 bool "oneit" |
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11 default y |
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12 help |
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13 usage: oneit [-p] [-c /dev/tty0] command [...] |
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14 |
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15 A simple init program that runs a single supplied command line with a |
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16 controlling tty (so CTRL-C can kill it). |
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17 |
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18 -p Power off instead of rebooting when command exits. |
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19 -c Which console device to use. |
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20 |
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21 The oneit command runs the supplied command line as a child process |
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22 (because PID 1 has signals blocked), attached to /dev/tty0, in its |
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23 own session. Then oneit reaps zombies until the child exits, at |
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24 which point it reboots (or with -p, powers off) the system. |
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25 */ |
34 | 26 |
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27 #define FOR_oneit |
34 | 28 #include "toys.h" |
29 #include <sys/reboot.h> | |
30 | |
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31 GLOBALS( |
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32 char *console; |
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33 ) |
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34 |
34 | 35 // The minimum amount of work necessary to get ctrl-c and such to work is: |
36 // | |
37 // - Fork a child (PID 1 is special: can't exit, has various signals blocked). | |
38 // - Do a setsid() (so we have our own session). | |
39 // - In the child, attach stdio to /dev/tty0 (/dev/console is special) | |
40 // - Exec the rest of the command line. | |
41 // | |
42 // PID 1 then reaps zombies until the child process it spawned exits, at which | |
43 // point it calls sync() and reboot(). I could stick a kill -1 in there. | |
44 | |
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45 |
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46 void oneit_main(void) |
34 | 47 { |
48 int i; | |
49 pid_t pid; | |
50 | |
51 // Create a new child process. | |
52 pid = vfork(); | |
53 if (pid) { | |
54 | |
55 // pid 1 just reaps zombies until it gets its child, then halts the system. | |
56 while (pid!=wait(&i)); | |
57 sync(); | |
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58 |
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59 // PID 1 can't call reboot() because it kills the task that calls it, |
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60 // which causes the kernel to panic before the actual reboot happens. |
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New build infrastructure to generate FLAG_ macros and TT alias, #define FOR_commandname before #including toys.h to trigger it. Rename DEFINE_GLOBALS() to just GLOBALS() (because I could never remember if it was DECLARE_GLOBALS). Convert existing commands to use new infrastructure, and replace optflag constants with FLAG_ macros where appropriate.
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61 if (!vfork()) |
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New build infrastructure to generate FLAG_ macros and TT alias, #define FOR_commandname before #including toys.h to trigger it. Rename DEFINE_GLOBALS() to just GLOBALS() (because I could never remember if it was DECLARE_GLOBALS). Convert existing commands to use new infrastructure, and replace optflag constants with FLAG_ macros where appropriate.
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62 reboot((toys.optflags & FLAG_p) ? RB_POWER_OFF : RB_AUTOBOOT); |
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63 sleep(5); |
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64 _exit(1); |
34 | 65 } |
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66 |
34 | 67 // Redirect stdio to /dev/tty0, with new session ID, so ctrl-c works. |
68 setsid(); | |
69 for (i=0; i<3; i++) { | |
70 close(i); | |
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71 xopen(TT.console ? TT.console : "/dev/tty0",O_RDWR); |
34 | 72 } |
73 | |
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74 // Can't xexec() here, because we vforked so we don't want to error_exit(). |
34 | 75 toy_exec(toys.optargs); |
76 execvp(*toys.optargs, toys.optargs); | |
77 _exit(127); | |
78 } |