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5 years ago
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
void usage() {
fprintf(stderr, "Usage: setpinebacklight [0-10]\n");
}
int main(int argc, char *argv[]) {
char * command;
int brightness;
if (argc < 2) {
usage();
return 1;
}
argc--;
brightness = atoi(argv[argc--]);
if (brightness < 0 || brightness > 10) {
usage();
return 1;
}
command = malloc(100);
sprintf(
command,
"sh -c 'echo %d > /sys/devices/platform/backlight/backlight/backlight/brightness'",
brightness
);
if (setuid(0)) {
fprintf(stderr, "setuid(0) failed\n");
} else {
return system(command);
}
}