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diff --git a/share/examples/Makefile b/share/examples/Makefile
--- a/share/examples/Makefile
+++ b/share/examples/Makefile
@@ -314,7 +314,8 @@
scsi_cmds.c
SE_DIRS+= sound
-SE_SOUND=
+SE_SOUND= \
+ sndstat_nv.c
SE_DIRS+= sound/oss
SE_SOUND_OSS= \
diff --git a/share/examples/sound/sndstat_nv.c b/share/examples/sound/sndstat_nv.c
new file mode 100644
--- /dev/null
+++ b/share/examples/sound/sndstat_nv.c
@@ -0,0 +1,206 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2024 The FreeBSD Foundation
+ *
+ * This software was 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/sndstat.h>
+#include <sys/nv.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+/*
+ * Example program showcasing how to use sndstat(4)'s nvlist interface, and how
+ * to fetch all currently supported fields, with the appropriate error checks.
+ *
+ * For more detailed information on what each nvlist field represents, please
+ * read sndstat(4)'s man page.
+ */
+
+int
+main(int argc, char *argv[])
+{
+ nvlist_t *nvl;
+ const nvlist_t * const *di;
+ const nvlist_t * const *cdi;
+ struct sndstioc_nv_arg arg;
+ size_t nitems, nchans, i, j;
+ int fd, pchan, rchan;
+
+ if ((fd = open("/dev/sndstat", O_RDONLY)) < 0)
+ err(1, "open(/dev/sndstat)");
+
+ if (ioctl(fd, SNDSTIOC_REFRESH_DEVS, NULL) < 0)
+ err(1, "ioctl(SNDSTIOC_REFRESH_DEVS)");
+
+ arg.nbytes = 0;
+ arg.buf = NULL;
+ if (ioctl(fd, SNDSTIOC_GET_DEVS, &arg) < 0)
+ err(1, "ioctl(SNDSTIOC_GET_DEVS#1)");
+
+ if ((arg.buf = malloc(arg.nbytes)) == NULL)
+ err(1, "malloc");
+
+ if (ioctl(fd, SNDSTIOC_GET_DEVS, &arg) < 0)
+ err(1, "ioctl(SNDSTIOC_GET_DEVS#2)");
+
+ if ((nvl = nvlist_unpack(arg.buf, arg.nbytes, 0)) == NULL)
+ err(1, "nvlist_unpack");
+
+ if (nvlist_empty(nvl) || !nvlist_exists(nvl, SNDST_DSPS))
+ errx(1, "no soundcards attached");
+
+ di = nvlist_get_nvlist_array(nvl, SNDST_DSPS, &nitems);
+ for (i = 0; i < nitems; i++) {
+#define NV(type, item) \
+ nvlist_get_ ## type (di[i], SNDST_DSPS_ ## item)
+ printf("nameunit=%s\n", NV(string, NAMEUNIT));
+ printf("\tfrom_user=%d\n", NV(bool, FROM_USER));
+ printf("\tdevnode=%s\n", NV(string, DEVNODE));
+ printf("\tdesc=%s\n", NV(string, DESC));
+ printf("\tprovider=%s\n", NV(string, PROVIDER));
+ printf("\tpchan=%d\n", (int)NV(number, PCHAN));
+ printf("\trchan=%d\n", (int)NV(number, RCHAN));
+ pchan = NV(number, PCHAN);
+ rchan = NV(number, RCHAN);
+#undef NV
+
+ if (pchan && !nvlist_exists(di[i], SNDST_DSPS_INFO_PLAY))
+ errx(1, "playback channel list empty");
+ if (rchan && !nvlist_exists(di[i], SNDST_DSPS_INFO_REC))
+ errx(1, "recording channel list empty");
+
+#define NV(type, mode, item) \
+ nvlist_get_ ## type (nvlist_get_nvlist(di[i], \
+ SNDST_DSPS_INFO_ ## mode), SNDST_DSPS_INFO_ ## item)
+ if (pchan) {
+ printf("\tplay_min_rate=%d\n",
+ (int)NV(number, PLAY, MIN_RATE));
+ printf("\tplay_max_rate=%d\n",
+ (int)NV(number, PLAY, MAX_RATE));
+ printf("\tplay_formats=%#08x\n",
+ (int)NV(number, PLAY, FORMATS));
+ printf("\tplay_min_chn=%d\n",
+ (int)NV(number, PLAY, MIN_CHN));
+ printf("\tplay_max_chn=%d\n",
+ (int)NV(number, PLAY, MAX_CHN));
+ }
+ if (rchan) {
+ printf("\trec_min_rate=%d\n",
+ (int)NV(number, REC, MIN_RATE));
+ printf("\trec_max_rate=%d\n",
+ (int)NV(number, REC, MAX_RATE));
+ printf("\trec_formats=%#08x\n",
+ (int)NV(number, REC, FORMATS));
+ printf("\trec_min_chn=%d\n",
+ (int)NV(number, REC, MIN_CHN));
+ printf("\trec_max_chn=%d\n",
+ (int)NV(number, REC, MAX_CHN));
+ }
+#undef NV
+
+ if (!nvlist_exists(di[i], SNDST_DSPS_PROVIDER_INFO))
+ continue;
+
+#define NV(type, item) \
+ nvlist_get_ ## type (nvlist_get_nvlist(di[i], \
+ SNDST_DSPS_PROVIDER_INFO), SNDST_DSPS_SOUND4_ ## item)
+ printf("\tunit=%d\n", (int)NV(number, UNIT));
+ printf("\tstatus=%s\n", NV(string, STATUS));
+ printf("\tbitperfect=%d\n", NV(bool, BITPERFECT));
+ printf("\tpvchan=%d\n", (int)NV(number, PVCHAN));
+ printf("\tpvchanrate=%d\n", (int)NV(number, PVCHANRATE));
+ printf("\tpvchanformat=%#08x\n", (int)NV(number, PVCHANFORMAT));
+ printf("\trvchan=%d\n", (int)NV(number, RVCHAN));
+ printf("\trvchanrate=%d\n", (int)NV(number, RVCHANRATE));
+ printf("\trvchanformat=%#08x\n", (int)NV(number, RVCHANFORMAT));
+#undef NV
+
+ if (!nvlist_exists(nvlist_get_nvlist(di[i],
+ SNDST_DSPS_PROVIDER_INFO), SNDST_DSPS_SOUND4_CHAN_INFO))
+ errx(1, "channel info list empty");
+
+ cdi = nvlist_get_nvlist_array(
+ nvlist_get_nvlist(di[i], SNDST_DSPS_PROVIDER_INFO),
+ SNDST_DSPS_SOUND4_CHAN_INFO, &nchans);
+ for (j = 0; j < nchans; j++) {
+#define NV(type, item) \
+ nvlist_get_ ## type (cdi[j], SNDST_DSPS_SOUND4_CHAN_ ## item)
+ printf("\tchan=%s\n", NV(string, NAME));
+ printf("\t\tparentchan=%s\n", NV(string, PARENTCHAN));
+ printf("\t\tunit=%d\n", (int)NV(number, UNIT));
+ printf("\t\tcaps=%#08x\n", (int)NV(number, CAPS));
+ printf("\t\tlatency=%d\n", (int)NV(number, LATENCY));
+ printf("\t\trate=%d\n", (int)NV(number, RATE));
+ printf("\t\tformat=%#08x\n", (int)NV(number, FORMAT));
+ printf("\t\tpid=%d\n", (int)NV(number, PID));
+ printf("\t\tcomm=%s\n", NV(string, COMM));
+ printf("\t\tintr=%d\n", (int)NV(number, INTR));
+ printf("\t\txruns=%d\n", (int)NV(number, XRUNS));
+ printf("\t\tfeedcnt=%d\n", (int)NV(number, FEEDCNT));
+ printf("\t\tleftvol=%d\n", (int)NV(number, LEFTVOL));
+ printf("\t\trightvol=%d\n", (int)NV(number, RIGHTVOL));
+ printf("\t\thwbuf_format=%#08x\n",
+ (int)NV(number, HWBUF_FORMAT));
+ printf("\t\thwbuf_size=%d\n",
+ (int)NV(number, HWBUF_SIZE));
+ printf("\t\thwbuf_blksz=%d\n",
+ (int)NV(number, HWBUF_BLKSZ));
+ printf("\t\thwbuf_blkcnt=%d\n",
+ (int)NV(number, HWBUF_BLKCNT));
+ printf("\t\thwbuf_free=%d\n",
+ (int)NV(number, HWBUF_FREE));
+ printf("\t\thwbuf_ready=%d\n",
+ (int)NV(number, HWBUF_READY));
+ printf("\t\tswbuf_format=%#08x\n",
+ (int)NV(number, SWBUF_FORMAT));
+ printf("\t\tswbuf_size=%d\n",
+ (int)NV(number, SWBUF_SIZE));
+ printf("\t\tswbuf_blksz=%d\n",
+ (int)NV(number, SWBUF_BLKSZ));
+ printf("\t\tswbuf_blkcnt=%d\n",
+ (int)NV(number, SWBUF_BLKCNT));
+ printf("\t\tswbuf_free=%d\n",
+ (int)NV(number, SWBUF_FREE));
+ printf("\t\tswbuf_ready=%d\n",
+ (int)NV(number, SWBUF_READY));
+ printf("\t\tswbuf_feederchain=%s\n",
+ NV(string, FEEDERCHAIN));
+#undef NV
+ }
+ }
+
+ free(arg.buf);
+ nvlist_destroy(nvl);
+ close(fd);
+
+ return (0);
+}

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