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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
void usage() {
fprintf(stderr, "Usage: setpineled [red|green|blue|white] [0-255]\n");
}
int main(int argc, char *argv[]) {
int brightness;
char * color;
char * command;
char * type;
if (argc < 2) {
usage();
return 1;
}
argc--;
brightness = atoi(argv[argc--]);
if (brightness < 0 || brightness > 255) {
usage();
return 1;
}
color = argv[argc--];
if (
strcmp(color, "red") &&
strcmp(color, "blue") &&
strcmp(color, "green") &&
strcmp(color, "white")
) {
usage();
return 1;
}
if (!strcmp(color, "white")) {
type = "flash";
} else {
type = "indicator";
}
command = malloc(80);
sprintf(
command,
"sh -c 'echo %d > /sys/class/leds/%s:%s/brightness'",
brightness, color, type
);
if (setuid(0)) {
fprintf(stderr, "setuid(0) failed\n");
} else {
return system(command);
}
}