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diff --git a/share/examples/Makefile b/share/examples/Makefile
--- a/share/examples/Makefile
+++ b/share/examples/Makefile
@@ -324,6 +324,7 @@
ossinit.h \
ossmidi.h \
midi.c \
+ polling.c \
README
SE_DIRS+= sunrpc
diff --git a/share/examples/sound/polling.c b/share/examples/sound/polling.c
new file mode 100644
--- /dev/null
+++ b/share/examples/sound/polling.c
@@ -0,0 +1,251 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 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 <err.h>
+#include <poll.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "ossinit.h"
+#include "ossmidi.h"
+
+static int8_t *ibuf = NULL;
+static int8_t *obuf = NULL;
+static sample_t *channels = NULL;
+static int algo = -1;
+static int maxfd;
+static int kq;
+static struct kevent targetEvent;
+static config_t config = {
+ .device = "/dev/dsp",
+ .channels = -1,
+ .frag = -1,
+ .sample_rate = 48000,
+ .sample_size = sizeof(sample_t),
+ .buffer_info.fragments = -1,
+ .mmap = 0,
+};
+static midi_config_t midi_config = {
+ .device = "/dev/umidi1.0",
+};
+
+void
+handle_midi(midi_config_t *midi_config)
+{
+ midi_event_t event;
+ uint8_t raw;
+ int l = -1;
+
+ if ((l = read(midi_config->fd, &raw, sizeof(raw))) != -1) {
+ if (!(raw & 0x80)) {
+ return;
+ }
+ event.type = raw & CMD_MASK;
+ event.channel = raw & CHANNEL_MASK;
+ switch (event.type) {
+ case NOTE_ON:
+ case NOTE_OFF:
+ case CONTROLER_ON:
+ if ((l = read(midi_config->fd, &(event.note),
+ sizeof(event.note))) == -1) {
+ perror("Error reading MIDI note");
+ exit(1);
+ }
+ if ((l = read(midi_config->fd, &(event.velocity),
+ sizeof(event.velocity))) == -1) {
+ perror("Error reading MIDI velocity");
+ exit(1);
+ }
+ break;
+ }
+ switch (event.type) {
+ case NOTE_ON:
+ case NOTE_OFF:
+ printf("Channel %d, note %d, velocity %d\n",
+ event.channel, event.note, event.velocity);
+ break;
+ case CONTROLER_ON:
+ printf("Channel %d, controller %d, value %d\n",
+ event.channel, event.controller, event.value);
+ break;
+ default:
+ printf("Unknown event type %d\n", event.type);
+ }
+ }
+}
+
+void
+handle_audio(config_t *config)
+{
+ int ret;
+ int bytes = config->buffer_info.bytes;
+
+ ret = read(config->fd, ibuf, bytes);
+ if (ret < bytes) {
+ fprintf(stderr, "Requested %d bytes, but read %d!\n", bytes,
+ ret);
+ return;
+ }
+ oss_split(config, (sample_t *)ibuf, channels);
+ /* All processing will happen here */
+ printf("Audio processing\n");
+ oss_merge(config, channels, (sample_t *)obuf);
+ ret = write(config->fd, obuf, bytes);
+ if (ret < bytes) {
+ fprintf(stderr, "Requested %d bytes, but wrote %d!\n", bytes,
+ ret);
+ }
+}
+
+void
+work()
+{
+ int ret;
+ if (algo == 0) {
+ fd_set fds;
+
+ FD_ZERO(&fds);
+ FD_SET(config.fd, &fds);
+ FD_SET(midi_config.fd, &fds);
+ ret = select(maxfd + 1, &fds, NULL, NULL, NULL);
+ if (FD_ISSET(config.fd, &fds)) {
+ handle_audio(&config);
+ } else if (FD_ISSET(midi_config.fd, &fds)) {
+ handle_midi(&midi_config);
+ }
+ } else if (algo == 1) {
+ // For simplicity of this example just use POLLIN.
+ // For more complex examples one can split input and output
+ // processing.
+ struct pollfd pfds[2];
+
+ pfds[0].fd = config.fd;
+ pfds[0].events = POLLIN;
+ pfds[1].fd = midi_config.fd;
+ pfds[1].events = POLLIN;
+ ret = poll(pfds, sizeof(pfds) / sizeof(struct pollfd), -1);
+ if (pfds[0].revents != 0) {
+ handle_audio(&config);
+ } else if (pfds[1].revents != 0) {
+ handle_midi(&midi_config);
+ }
+ } else if (algo == 2) {
+ ret = kevent(kq, NULL, 0, &targetEvent, 1, NULL);
+ if (ret == -1) {
+ err(EXIT_FAILURE, "kevent wait");
+ } else if (ret > 0) {
+ if (targetEvent.flags & EV_ERROR) {
+ errx(EXIT_FAILURE, "Event error: %s",
+ strerror(targetEvent.data));
+ return;
+ }
+ if (targetEvent.ident == config.fd) {
+ handle_audio(&config);
+ } else if (targetEvent.ident == midi_config.fd) {
+ handle_midi(&midi_config);
+ }
+ }
+ }
+}
+
+int
+main()
+{
+ int bytes;
+ int ret;
+ char ch;
+ struct kevent events[2];
+
+ config.format = format;
+ oss_init(&config);
+ oss_midi_init(&midi_config);
+
+ /*
+ * Allocate input and output buffers so that their size match
+ * frag_size
+ */
+ bytes = config.buffer_info.bytes;
+ ibuf = malloc(bytes);
+ obuf = malloc(bytes);
+ channels = malloc(bytes);
+ maxfd = config.fd > midi_config.fd ? midi_config.fd : midi_config.fd;
+
+ for (;;) {
+ printf(
+ "Choose waiting algorithm: (s)elect, (p)oll, (k)queue or (q)uit: ");
+ ch = getchar();
+ switch (ch) {
+ case 'q':
+ return 0;
+ case 's':
+ algo = 0;
+ break;
+ case 'p':
+ algo = 1;
+ break;
+ case 'k': {
+ algo = 2;
+ kq = kqueue();
+ if (kq == -1) {
+ err(EXIT_FAILURE, "kqueue() failed");
+ }
+
+ EV_SET(events, config.fd, EVFILT_READ,
+ EV_ADD | EV_CLEAR, NOTE_READ, 0, NULL);
+ EV_SET(events + 1, midi_config.fd, EVFILT_READ,
+ EV_ADD | EV_CLEAR, NOTE_READ, 0, NULL);
+ ret = kevent(kq, events, 2, NULL, 0, NULL);
+ if (ret == -1) {
+ err(EXIT_FAILURE, "kevent register");
+ }
+ break;
+ }
+ default:
+ algo = -1;
+ while ((ch = getchar()) != '\n' && ch != EOF)
+ ;
+ break;
+ }
+ if (algo >= 0) {
+ break;
+ }
+ }
+ for (;;) {
+ work();
+ }
+
+ /* Cleanup */
+ free(channels);
+ free(obuf);
+ free(ibuf);
+ close(kq);
+ close(midi_config.fd);
+ close(config.fd);
+ return (0);
+}

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