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Index: share/examples/sound/mmap.c
===================================================================
--- /dev/null
+++ share/examples/sound/mmap.c
@@ -0,0 +1,149 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2021 Goran Mekić
+ * Copyright (c) 2024 The FreeBSD Foundation
+ *
+ * Portions of this software were developed by Christos Margiolis
+ * <christos@FreeBSD.org> under sponsorship from the FreeBSD Foundation.
+ *
+ * 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/mman.h>
+#include <sys/event.h>
+
+#include <fcntl.h>
+
+#include "oss.h"
+
+static int
+add_to_sync_group(int fd, int group, int out) {
+ oss_syncgroup sync_group = {0, 0, {0}};
+ sync_group.id = group;
+ if (out)
+ sync_group.mode |= PCM_ENABLE_OUTPUT;
+ else
+ sync_group.mode |= PCM_ENABLE_INPUT;
+ if (ioctl(fd, SNDCTL_DSP_SYNCGROUP, &sync_group) == 0)
+ return sync_group.id;
+ err(1, "Failed to add %d to syncgroup", sync_group.id);
+}
+
+static void
+start_sync_group(int fd, int group) {
+ int err = ioctl(fd, SNDCTL_DSP_SYNCSTART, &group);
+ if (err != 0)
+ errx(1, "Starting sync group failed");
+}
+
+int
+main(int argc, char *argv[])
+{
+ int rc, bytes, kq;
+ int group = 0;
+ uint8_t *buf;
+ struct kevent event = {};
+ struct config config_in = {
+ .device = "/dev/dsp",
+ .mode = O_RDONLY | O_EXCL | O_NONBLOCK,
+ .format = AFMT_S32_NE,
+ .sample_rate = 48000,
+ .mmap = 1,
+ };
+ struct config config_out = {
+ .device = "/dev/dsp",
+ .mode = O_WRONLY | O_EXCL | O_NONBLOCK,
+ .format = AFMT_S32_NE,
+ .sample_rate = 48000,
+ .mmap = 1,
+ };
+
+ oss_init(&config_in);
+ oss_init(&config_out);
+
+ /* Allocate and mmap buffers */
+ bytes = config_in.buffer_info.bytes < config_out.buffer_info.bytes
+ ? config_in.buffer_info.bytes
+ : config_out.buffer_info.bytes;
+ buf = malloc(bytes);
+ config_in.buf = mmap(NULL, config_in.buffer_info.bytes, PROT_READ, MAP_SHARED, config_in.fd, 0);
+ if (config_in.buf == MAP_FAILED)
+ err(1, "Memory map failed");
+ config_out.buf = mmap(NULL, config_out.buffer_info.bytes, PROT_WRITE, MAP_SHARED, config_out.fd, 0);
+ if (config_out.buf == MAP_FAILED)
+ err(1, "Memory map failed");
+
+ /* Initialize kqueue */
+ kq = kqueue();
+ if (kq == -1)
+ err(1, "Failed to allocate kqueue");
+ EV_SET(&event, config_in.fd, EVFILT_READ, EV_ADD | EV_CLEAR, 0, 0, 0);
+ event.udata = &config_in;
+ if (kevent(kq, &event, 1, NULL, 0, NULL) < 0)
+ err(1, "Failed to register kevent");
+ EV_SET(&event, config_out.fd, EVFILT_WRITE, EV_ADD | EV_CLEAR, 0, 0, 0);
+ event.udata = &config_out;
+ if (kevent(kq, &event, 1, NULL, 0, NULL) < 0)
+ err(1, "Failed to register kevent");
+
+ group = add_to_sync_group(config_in.fd, group, 0);
+ group = add_to_sync_group(config_out.fd, group, 1);
+ start_sync_group(config_in.fd, group);
+
+ /* Main loop */
+ for (;;) {
+ rc = kevent(kq, NULL, 0, &event, 1, NULL);
+ if (rc == -1 || event.data == 0) {
+ warn("Event error");
+ break;
+ }
+ if (event.flags & EV_ERROR) {
+ warn("Event error: %s", strerror(event.data));
+ break;
+ }
+ if (event.udata == &config_out)
+ memcpy(config_out.buf, buf, bytes);
+ else
+ memcpy(buf, config_in.buf, bytes);
+ }
+
+ /* Cleanup */
+ free(buf);
+ if (munmap(config_in.buf, config_in.buffer_info.bytes) != 0)
+ err(1, "Memory unmap failed");
+ config_in.buf = NULL;
+ if (munmap(config_out.buf, config_out.buffer_info.bytes) != 0)
+ err(1, "Memory unmap failed");
+ config_out.buf = NULL;
+ EV_SET(&event, config_in.fd, EVFILT_READ, EV_DELETE, 0, 0, 0);
+ if (kevent(kq, &event, 1, NULL, 0, NULL) < 0)
+ err(1, "Failed to unregister input kevent");
+ EV_SET(&event, config_out.fd, EVFILT_WRITE, EV_DELETE, 0, 0, 0);
+ if (kevent(kq, &event, 1, NULL, 0, NULL) < 0)
+ err(1, "Failed to unregister input kevent");
+ close(kq);
+ close(config_in.fd);
+ close(config_out.fd);
+
+ return (0);
+}

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