1 files changed, 79 insertions, 0 deletions
diff --git a/share/examples/sound/kqueue.c b/share/examples/sound/kqueue.c
new file mode 100644
index 000000000000..9117d7a389bb
--- /dev/null
+++ b/share/examples/sound/kqueue.c
@@ -0,0 +1,79 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2025 Goran Mekić
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/event.h>
+
+#include "oss.h"
+
+int
+main(int argc, char *argv[])
+{
+	struct config config = {
+		.device = "/dev/dsp",
+		.mode = O_RDWR,
+		.format = AFMT_S32_NE,
+		.sample_rate = 48000,
+	};
+	struct kevent event = {};
+	int rc, bytes, kq;
+
+	oss_init(&config);
+	bytes = config.buffer_info.bytes;
+
+	if ((kq = kqueue()) < 0)
+		err(1, "Failed to allocate kqueue");
+	EV_SET(&event, config.fd, EVFILT_WRITE, EV_ADD | EV_CLEAR, 0, 0, 0);
+	if (kevent(kq, &event, 1, NULL, 0, NULL) < 0)
+		err(1, "Failed to register kevent");
+	for (;;) {
+		if (kevent(kq, NULL, 0, &event, 1, NULL) < 0) {
+			warn("Event error");
+			break;
+		}
+		if (event.flags & EV_ERROR) {
+			warn("Event error: %s", strerror(event.data));
+			break;
+		}
+		if ((rc = read(config.fd, config.buf, bytes)) < bytes) {
+			warn("Requested %d bytes, but read %d!\n", bytes, rc);
+			break;
+		}
+		if ((rc = write(config.fd, config.buf, bytes)) < bytes) {
+			warn("Requested %d bytes, but wrote %d!\n", bytes, rc);
+			break;
+		}
+	}
+	EV_SET(&event, config.fd, EVFILT_WRITE, EV_DELETE, 0, 0, 0);
+	if (kevent(kq, &event, 1, NULL, 0, NULL) < 0)
+		err(1, "Failed to unregister kevent");
+	close(kq);
+
+	free(config.buf);
+	close(config.fd);
+
+	return (0);
+}