Works with multiple backlights now
This commit is contained in:
rexy712
parent
20e7754359
commit
1bfcc97d03
3
TODO
Normal file
3
TODO
Normal file
@ -0,0 +1,3 @@
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Individual device control
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Query backlight percentage (get)
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allow fade in and fade out
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1
brightness
Normal file
1
brightness
Normal file
@ -0,0 +1 @@
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0
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2
makefile
2
makefile
@ -9,6 +9,8 @@ rexbacklight: rexbacklight.c
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install:
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install -m4711 -o root -g root -s rexbacklight /usr/bin/rexbacklight
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.PHONY: uninstall
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rm /usr/bin/rexbacklight
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.PHONY: clean
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clean:
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rm rexbacklight
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213
rexbacklight.c
213
rexbacklight.c
@ -21,8 +21,12 @@
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include <errno.h>
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void usage(void){
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static const char* backlight_dir = "/sys/class/backlight/";
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void usage(int exit_val){
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fprintf(stderr, "Usage: rexbacklight [option]\n\n");
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fprintf(stderr, "Options:\n");
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@ -33,13 +37,15 @@ void usage(void){
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fprintf(stderr, " max\n");
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fprintf(stderr, " min\n");
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fprintf(stderr, "\nrexbacklight Copyright (C) 2018 rexy712\n");
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fprintf(stderr, "This program comes with ABSOLUTELY NO WARRANTY.\n");
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fprintf(stderr, "This is free software, and you are welcome to redistribute it\n");
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fprintf(stderr, "under certain conditions; see the GNU GPLv3 for details.\n");
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fprintf(stderr, "A copy of the GPLv3 is available with the source in the file 'LICENSE'\n");
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if(!exit_val){
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fprintf(stderr, "\nrexbacklight Copyright (C) 2018 rexy712\n");
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fprintf(stderr, "This program comes with ABSOLUTELY NO WARRANTY.\n");
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fprintf(stderr, "This is free software, and you are welcome to redistribute it\n");
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fprintf(stderr, "under certain conditions; see the GNU GPLv3 for details.\n");
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fprintf(stderr, "A copy of the GPLv3 is available with the source in the file 'LICENSE'\n");
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}
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exit(-1);
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exit(exit_val);
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}
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int check_valid_files(const char* f1, const char* f2){
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@ -63,6 +69,47 @@ int check_valid_files(const char* f1, const char* f2){
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return 0;
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}
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struct string_array{
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char** list;
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int size;
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};
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//Get a list of backlight devices in sysfs
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struct string_array get_backlight_sources(void){
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DIR* fd;
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struct dirent* dir;
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fd = opendir(backlight_dir);
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if(!fd){
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fprintf(stderr, "Unable to open '%s' for reading!\n", backlight_dir);
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return (struct string_array){.list = NULL, .size = 0};
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}
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char** list = malloc(sizeof(const char*) * 8);
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int i;
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for(i = 0;(dir = readdir(fd));){
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if(!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, "..")){
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continue;
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}
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list[i] = malloc(strlen(dir->d_name) + 1);
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strcpy(list[i], dir->d_name);
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i++;
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}
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closedir(fd);
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return (struct string_array){.list = list, .size = i};
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}
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void free_string_array(struct string_array* s){
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for(int i = 0;i < s->size;i++)
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free(s->list[i]);
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free(s->list);
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}
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int get_brightness(const char* file){
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FILE* bright = fopen(file, "r");
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char buff[127];
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@ -79,89 +126,119 @@ int get_brightness(const char* file){
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return atof(buff);
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}
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int process_arg(char* arg, float min, float current, float max){
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//Amount to inc/dec
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int delta = delta = max * atof(arg + 1) / 100.0;
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//Increment
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if(arg[0] == '+'){
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delta = delta + current;
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if(delta >= max)
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return max;
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else{
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return delta;
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}
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//Decrement
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}else if(arg[0] == '-'){
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delta = current - delta;
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if(delta <= min)
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return min;
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else
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return delta;
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//Directly set
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}else if(arg[0] == '='){
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if(delta >= max)
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return max;
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else if(delta <= min)
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return min;
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else
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return delta;
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//Set to minimum plus one (so backlight is actually on!)
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}else if(!strcmp("min", arg)){
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return min + 1;
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//Turn off backlight
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}else if(!strcmp("off", arg)){
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return min;
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//Set to maximum
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}else if(!strcmp("max", arg)){
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return max;
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//Unknown option
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}else{
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usage(-1);
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}
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return current;
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}
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//argv[1] shall be [+-=]<percentage>|min|max|off
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int main(int argc, char** argv){
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const char* backlight_file = "/sys/class/backlight/intel_backlight/brightness";
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const char* max_backlight_file = "/sys/class/backlight/intel_backlight/max_brightness";
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const char* backlight_file = "brightness";
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const char* max_backlight_file = "max_brightness";
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//Make sure we have an argument and it is at least 2 characters long
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if(argc < 2 || strlen(argv[1]) < 2)
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usage();
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else if(!strcmp(argv[1], "--help"))
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usage();
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if(argc < 2 || !strcmp(argv[1], "--help"))
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usage(0);
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else if(strlen(argv[1]) < 2)
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usage(-1);
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//Gain access to sysfs files
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if(setuid(0)){
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fprintf(stderr, "Unable to setuid to 0!\n");
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return -3;
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}
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//Make sure we aren't in a chroot environment (prevents writing to a file we don't want to!)
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if(check_valid_files("/", "/proc/1/root")){
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fprintf(stderr, "No chroot today\n");
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return -4;
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}
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//Min brightness is just 0, so set it up front
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float min_brightness = 0;
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float max_brightness = get_brightness(max_backlight_file);
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float current_brightness = get_brightness(backlight_file);
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//Now that we've verified we're in a safe environment to do the work,
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//Let's get everything set up!
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//Amount to inc/dec
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int delta;
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if(strlen(argv[1]) > 0)
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delta = max_brightness * atof(argv[1] + 1) / 100.0;
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else
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delta = 0;
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//Open brightness file for writing
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FILE* bright = fopen(backlight_file, "w+");
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if(!bright){
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fprintf(stderr, "Unable to open brightness file \"%s\" for writing!\n", backlight_file);
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return 1;
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//Acquire a list of backlight devices in sysfs
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struct string_array backlight_names = get_backlight_sources();
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if(backlight_names.size == 0){
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fprintf(stderr, "No backlights devices found!\n");
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return -1;
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}
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//Increment
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if(argv[1][0] == '+'){
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delta = delta + current_brightness;
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if(delta >= max_brightness)
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fprintf(bright, "%d", (int)max_brightness);
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else{
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fprintf(bright, "%d", delta);
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//save our starting directory so we can change to each backlight directory
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const char* starting_dir = getcwd(NULL, 0);
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if(chdir(backlight_dir)){
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fprintf(stderr, "Unable to read backlight sysfs directory!\n");
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return -2;
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}
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//Set all backlight sources to the requested percentage
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for(int i = 0;i < backlight_names.size;i++){
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if(chdir(backlight_names.list[i])){
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fprintf(stderr, "Unable to open backlight directory \"%s%s\"!\n", backlight_dir, backlight_names.list[i]);
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continue;
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}
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//Decrement
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}else if(argv[1][0] == '-'){
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delta = current_brightness - delta;
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if(delta <= min_brightness)
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fprintf(bright, "%d", (int)min_brightness);
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else
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fprintf(bright, "%d", delta);
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//Open brightness file for writing
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int out = process_arg(argv[1], 0, get_brightness(backlight_file), get_brightness(max_backlight_file));
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FILE* bright = fopen(backlight_file, "w+");
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if(!bright){
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fprintf(stderr, "Unable to open brightness file \"%s\" for writing!\n", backlight_file);
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continue;
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}
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fprintf(bright, "%d", out);
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//Directly set
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}else if(argv[1][0] == '='){
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if(delta >= max_brightness)
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fprintf(bright, "%d", (int)max_brightness);
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else if(delta <= min_brightness)
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fprintf(bright, "%d", (int)min_brightness);
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else
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fprintf(bright, "%d", delta);
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//Set to minimum plus one (so backlight is actually on!)
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}else if(!strcmp("min", argv[1])){
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fprintf(bright, "%d", (int)(min_brightness + 1));
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//Turn off backlight
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}else if(!strcmp("off", argv[1])){
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fprintf(bright, "%d", (int)min_brightness);
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//Set to maximum
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}else if(!strcmp("max", argv[1])){
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fprintf(bright, "%d", (int)max_brightness);
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//Unknown option
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}else{
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fclose(bright);
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usage();
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}
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fclose(bright);
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free_string_array(&backlight_names);
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if(chdir(starting_dir)){
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fprintf(stderr, "Could not return to starting directory!\nWas the directory moved/deleted?\n");
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if(chdir(getenv("HOME")) || chdir("/")){
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return -5;
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}
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}
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return 0;
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}
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