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diff --git a/share/examples/sound/mmap.c b/share/examples/sound/mmap.c
new file mode 100644
--- /dev/null
+++ b/share/examples/sound/mmap.c
@@ -0,0 +1,122 @@
+/*
+ * 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[])
+{
+ int rc, bytes, kq;
+ uint8_t *buf;
+ oss_syncgroup sync_group = {0, 0, {0}};
+ 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);
+
+ /* 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");
+
+ /* Configure and start sync group */
+ sync_group.mode = PCM_ENABLE_INPUT;
+ if (ioctl(config_in.fd, SNDCTL_DSP_SYNCGROUP, &sync_group) < 0)
+ err(1, "Failed to add input to syncgroup");
+ sync_group.mode = PCM_ENABLE_OUTPUT;
+ if (ioctl(config_out.fd, SNDCTL_DSP_SYNCGROUP, &sync_group) < 0)
+ err(1, "Failed to add output to syncgroup");
+ if (ioctl(config_in.fd, SNDCTL_DSP_SYNCSTART, &sync_group.id) < 0)
+ err(1, "Starting sync group failed");
+
+ /* 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);
+}
diff --git a/share/examples/sound/oss.h b/share/examples/sound/oss.h
--- a/share/examples/sound/oss.h
+++ b/share/examples/sound/oss.h
@@ -25,6 +25,7 @@
* SUCH DAMAGE.
*/
+#include <sys/mman.h>
#include <sys/soundcard.h>
#include <err.h>
@@ -84,7 +85,7 @@
oss_init(struct config *config)
{
unsigned long request = SNDCTL_DSP_GETOSPACE;
- int tmp = 0;
+ int tmp = 0, prot = 0;
if ((config->fd = open(config->device, config->mode)) < 0)
err(1, "Error opening the device %s", config->device);
@@ -194,7 +195,6 @@
}
config->sample_count = config->buffer_info.bytes / config->sample_size;
config->chsamples = config->sample_count / config->audio_info.max_channels;
- config->buf = malloc(config->buffer_info.bytes);
printf("bytes: %d, fragments: %d, fragsize: %d, fragstotal: %d, "
"samples: %d\n",
@@ -202,21 +202,36 @@
config->buffer_info.fragsize, config->buffer_info.fragstotal,
config->sample_count);
- /* Set the trigger */
+ /* Set trigger direction and mmap protection */
switch (config->mode & O_ACCMODE) {
case O_RDONLY:
tmp = PCM_ENABLE_INPUT;
+ prot = PROT_READ;
break;
case O_WRONLY:
tmp = PCM_ENABLE_OUTPUT;
+ prot = PROT_WRITE;
break;
case O_RDWR:
tmp = PCM_ENABLE_INPUT | PCM_ENABLE_OUTPUT;
+ prot = PROT_READ | PROT_WRITE;
break;
default:
errx(1, "Invalid mode %d", config->mode);
break;
}
+
+ /* Map or allocate the buffer */
+ if (config->mmap) {
+ config->buf = mmap(NULL, config->buffer_info.bytes, prot, MAP_SHARED, config->fd, 0);
+ if (config->buf == MAP_FAILED)
+ err(1, "Memory map failed");
+ } else {
+ if ((config->buf = malloc(config->buffer_info.bytes)) == NULL)
+ err(1, "Allocating buffer failed");
+ }
+
+ /* Set the trigger */
if (ioctl(config->fd, SNDCTL_DSP_SETTRIGGER, &tmp) < 0)
err(1, "Failed to set trigger");
}

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