Rewrite and relicense

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 45 insertions, 0 deletions

diff --git a/vtchs.c b/vtchs.c
new file mode 100644
index 0000000..b2e67e0
--- /dev/null
+++ b/vtchs.c
@@ -0,0 +1,45 @@
+/* See LICENSE file for copyright and license details. */
+#include <linux/vt.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stropts.h>
+#include <unistd.h>
+
+#define VT(OP, ARG) vt(OP, ARG, #OP)
+
+static char *argv0;
+
+static void
+vt(int op, void *arg, const char *opstr)
+{
+	if (ioctl(STDIN_FILENO, op, arg) == -1) {
+		fprintf(stderr, "%s: ioctl <stdin> %s: %s\n", argv0, opstr, strerror(errno));
+		exit(1);
+	}
+}
+
+int
+main(int argc, char *argv[])
+{
+	struct vt_event e;
+	struct vt_stat s;
+
+	argv0 = *argv++, argc--;
+	if (argc != (*argv && !strcmp(*argv, "=="))) {
+		fprintf(stderr, "usage: %s\n", argv0);
+		exit(1);
+	}
+
+	VT(VT_GETSTATE, &s);
+	printf("%u\n", s.v_active);
+
+	e.event = VT_EVENT_SWITCH;
+	for (;;) {
+		VT(VT_WAITEVENT, &e);
+		printf("%u\n", e.newev);
+	}
+
+	return 0;
+}