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Added udev rule and init.d script for allowing users of video group to control backlight

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This commit is contained in:
rexy712 2018-01-12 17:59:12 -08:00
parent 3cb653fdd2
commit 33cf717cd3
5 changed files with 26 additions and 40 deletions
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1
TODO
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@ -1,3 +1,4 @@
Individual device control
List devices
Query backlight percentage (get)
allow fade in and fade out

11
makefile
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@ -1,16 +1,21 @@
.PHONY: all
all: rexbacklight
rexbacklight: rexbacklight.c
gcc -std=c11 -O2 -Wall -Wextra -pedantic rexbacklight.c -o rexbacklight
rexbacklight: src/rexbacklight.c
gcc -std=c11 -O2 -Wall -Wextra -pedantic src/rexbacklight.c -o rexbacklight
strip --strip-all rexbacklight
.PHONY: install
install:
install -m4711 -o root -g root -s rexbacklight /usr/bin/rexbacklight
install -m755 -o root -g root -s rexbacklight /usr/bin/rexbacklight
install -m600 -o root -g root rules/91-backlight.rules /etc/udev/rules.d/91-backlight.rules
install -m755 -o root -g root rules/backlight /etc/init.d/backlight
.PHONY: uninstall
uninstall:
rm /usr/bin/rexbacklight
rm /etc/udev/rules.d/91-backlight.rules
rm /etc/init.d/backlight
.PHONY: clean
clean:
rm rexbacklight

3
rules/91-backlight.rules Normal file
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@ -0,0 +1,3 @@
SUBSYSTEM=="backlight", ACTION=="add", \
RUN+="/bin/chgrp video %S%p/brightness", \
RUN+="/bin/chmod g+w %S%p/brightness"

13
rules/backlight Executable file
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@ -0,0 +1,13 @@
#!/sbin/openrc-run
#Copyright (C) 2018 rexy712
start() {
ebegin "Forcing intel_backlight to work correctly"
/bin/chgrp video /sys/class/backlight/intel_backlight/brightness
/bin/chmod g+w /sys/class/backlight/intel_backlight/brightness
eend $?
}
stop() {
eend ${ret}
}

38
rexbacklight.c → src/rexbacklight.c
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@ -48,27 +48,6 @@ void usage(int exit_val){
exit(exit_val);
}
int check_valid_files(const char* f1, const char* f2){
struct stat file1, file2;
if(stat(f1, &file1)){
printf("failed to open '%s'\n", f1);
return -1;
}
if(stat(f2, &file2)){
printf("failed to open '%s'\n", f2);
return -1;
}
//Same device and same inode means same file
//device id
if(file1.st_dev != file2.st_dev)
return -2;
//inode number
if(file1.st_ino != file2.st_ino)
return -2;
return 0;
}
struct string_array{
char** list;
int size;
@ -185,21 +164,6 @@ int main(int argc, char** argv){
else if(strlen(argv[1]) < 2)
usage(-1);
//Gain access to sysfs files
if(setuid(0)){
fprintf(stderr, "Unable to setuid to 0!\n");
return -3;
}
//Make sure we aren't in a chroot environment (prevents writing to a file we don't want to!)
if(check_valid_files("/", "/proc/1/root")){
fprintf(stderr, "No chroot today\n");
return -4;
}
//Now that we've verified we're in a safe environment to do the work,
//Let's get everything set up!
//Acquire a list of backlight devices in sysfs
struct string_array backlight_names = get_backlight_sources();
if(backlight_names.size == 0){
@ -226,7 +190,7 @@ int main(int argc, char** argv){
int out = process_arg(argv[1], 0, get_brightness(backlight_file), get_brightness(max_backlight_file));
FILE* bright = fopen(backlight_file, "w+");
if(!bright){
fprintf(stderr, "Unable to open brightness file \"%s\" for writing!\n", backlight_file);
fprintf(stderr, "Unable to open brightness file \"%s%s\" for writing!\n", backlight_dir, backlight_file);
continue;
}
fprintf(bright, "%d", out);