├── LICENSE
├── Makefile
├── README.md
├── poweroff
└── shinit


/LICENSE:
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 1 | MIT License
 2 | 
 3 | Copyright (c) 2020 Cem Keylan
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


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/Makefile:
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 1 | PREFIX = /usr/local
 2 | BINDIR = ${PREFIX}/bin
 3 | 
 4 | install:
 5 | 	mkdir -p ${DESTDIR}${BINDIR}
 6 | 	cp shinit poweroff ${DESTDIR}${BINDIR}
 7 | 	chmod 755 ${DESTDIR}${BINDIR}/shinit
 8 | 	chmod 755 ${DESTDIR}${BINDIR}/poweroff
 9 | 	ln -sf poweroff ${DESTDIR}${BINDIR}/reboot
10 | 
11 | uninstall:
12 | 	rm -f ${DESTDIR}${BINDIR}/shinit \
13 | 		${DESTDIR}${BINDIR}/poweroff \
14 | 		${DESTDIR}${BINDIR}/reboot
15 | 


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/README.md:
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 1 | shinit
 2 | ======
 3 | 
 4 | Basic init daemon in POSIX sh with only 5 lines of code. It supports acting upon
 5 | signals.
 6 | 
 7 | On USR1 signal it will poweroff, and on INT signal it will reboot.
 8 | 
 9 | 
10 | Installing
11 | ----------
12 | 
13 | Before installing, edit the second command to use your boot/poweroff script. If
14 | you are using Carbs Linux or KISS, you don't need to change it.
15 | 
16 | You can then install with `make`.
17 | 
18 |     make install
19 | 
20 | 
21 | Note on halting the system
22 | --------------------------
23 | 
24 | shinit does **NOT** deal with system halting. You will need an extra utility for
25 | that given purpose. `ubase halt` deals with this. You can also use compile
26 | this really simple C program that tells to kernel to shutdown or reboot.
27 | 
28 | ``` c
29 | #include <sys/reboot.h>
30 | 
31 | int
32 | main(int argc, char *argv[])
33 | {
34 |     switch ((int) argv[argc < 2 ? 0 : 1][0]) {
35 |     case 'p': reboot(RB_POWER_OFF); break;
36 |     case 'r': reboot(RB_AUTOBOOT);  break;
37 |     default: return 1;
38 |     }
39 |     return 0;
40 | }
41 | ```
42 | 
43 | You can compile the following program to something named `halt` or whatever you
44 | like. If you call `halt p` it will power off, if you call `halt r` it will
45 | reboot. Just note that this needs to be at the end of your init script, because
46 | this command will shut your computer down straight away. You can do the
47 | following check at the end of your init script:
48 | 
49 | ``` sh
50 | case "$1" in
51 |     poweroff) halt p ;;
52 |     reboot)   halt r ;;
53 | esac
54 | ```
55 | 


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/poweroff:
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1 | #!/bin/sh
2 | # An example way to poweroff/reboot.
3 | 
4 | case "${0##*/}" in poweroff) kill -s USR1 1 ;; reboot) kill -s INT 1 ; esac
5 | 


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/shinit:
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 1 | #!/bin/sh
 2 | 
 3 | # Exit with status 1 if pid is not 1
 4 | [ $$ -eq 1 ] || exit 1
 5 | 
 6 | # Run the boot script
 7 | /lib/init/rc.boot
 8 | 
 9 | # Add signal traps for poweroff and reboot
10 | trap '/lib/init/rc.shutdown poweroff' USR1
11 | trap '/lib/init/rc.shutdown reboot'   INT
12 | 
13 | # Sleep for a day. As sleep is not a builtin for every
14 | # shell, we don't want to keep spawning processes, hence
15 | # the long sleep time.
16 | #
17 | # We also don't want to run 'while :; do :; done' as
18 | # it would lead to high cpu usage.
19 | #
20 | # Since we want to trap signals, We fork and wait for the
21 | # sleep. If sleep is not forked, signals will not be acted
22 | # upon.
23 | while :; do sleep 86400 & wait ; done
24 | 


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