1 files changed, 38 insertions, 0 deletions
diff --git a/setbkl.c b/setbkl.c
new file mode 100644
index 0000000..05a7ffb
--- /dev/null
+++ b/setbkl.c
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: BSD-2-Clause
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <glob.h>
+
+int
+main(int argc, char **argv)
+{
+	if (argc != 2) {
+		dprintf(2, "%s: missing brightness argument\n", argv[0]);
+		return 1;
+	}
+
+	int fd = open("/sys/class/backlight/apple-panel-bl/brightness", O_WRONLY);
+	if (fd == -1) {
+		dprintf(2, "%s: can't open\n", argv[0]);
+		return 6;
+	}
+	ssize_t wl = (write(fd, argv[1], strlen(argv[1])));
+	if (wl == -1) {
+		dprintf(2, "%s: can't write\n", argv[0]);
+		return 7;
+	} else if ((size_t)wl == strlen(argv[1])) {
+	} else {
+		dprintf(2, "%s: incomplete write\n", argv[0]);
+		return 8;
+	}
+	if (close(fd) == -1) {
+		dprintf(2, "%s: can't close\n", argv[0]);
+		return 9;
+	}
+
+	return 0;
+}