Initial commit

programs/sxmo_setpinebacklight.c

@@ -0,0 +1,37 @@
+#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);
+  }
+}