Add barebones eject(1)

Makefile

@@ -22,6 +22,7 @@ SRC = \
 	clear.c             \
 	df.c                \
 	dmesg.c             \
+	eject.c             \
 	fallocate.c         \
 	free.c              \
 	halt.c              \

eject.c

@@ -0,0 +1,48 @@
+/* See LICENSE file for copyright and license details. */
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include "util.h"
+
+enum {
+	CDROM_EJECT = 0x5309,
+	CDROM_CLOSE_TRAY = 0x5319,
+};
+
+static void
+usage(void)
+{
+	eprintf("usage: %s [-t]\n", argv0);
+}
+
+int
+main(int argc, char *argv[])
+{
+	int fd, out;
+	const char *cdrom = "/dev/sr0";
+	int tflag = 0;
+
+	ARGBEGIN {
+	case 't':
+		tflag = 1;
+		break;
+	default:
+		usage();
+	} ARGEND;
+
+	fd = open(cdrom, O_RDONLY | O_NONBLOCK);
+	if (fd < 0)
+		eprintf("open %s:", cdrom);
+	if (tflag) {
+		if (ioctl(fd, CDROM_CLOSE_TRAY, &out) < 0)
+			eprintf("ioctl:");
+	} else {
+		if (ioctl(fd, CDROM_EJECT, &out) < 0)
+			eprintf("ioctl:");
+	}
+	close(fd);
+	return 0;
+}