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diff --git a/tests/sys/Makefile b/tests/sys/Makefile
--- a/tests/sys/Makefile
+++ b/tests/sys/Makefile
@@ -31,6 +31,7 @@
TESTS_SUBDIRS+= opencrypto
TESTS_SUBDIRS+= posixshm
TESTS_SUBDIRS+= ses
+TESTS_SUBDIRS+= sound
TESTS_SUBDIRS+= sys
TESTS_SUBDIRS+= vfs
TESTS_SUBDIRS+= vm
diff --git a/tests/sys/sound/Makefile b/tests/sys/sound/Makefile
new file mode 100644
--- /dev/null
+++ b/tests/sys/sound/Makefile
@@ -0,0 +1,9 @@
+PACKAGE= tests
+
+TESTSDIR= ${TESTSBASE}/sys/sound
+
+ATF_TESTS_C+= sndstat
+
+LDFLAGS+= -lnv
+
+.include <bsd.test.mk>
diff --git a/tests/sys/sound/sndstat.c b/tests/sys/sound/sndstat.c
new file mode 100644
--- /dev/null
+++ b/tests/sys/sound/sndstat.c
@@ -0,0 +1,208 @@
+/*-
+ * 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/param.h>
+#include <sys/linker.h>
+#include <sys/sndstat.h>
+#include <sys/nv.h>
+
+#include <atf-c.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+static void
+load_dummy(void)
+{
+ if (kldload("snd_dummy.ko") < 0 && errno != EEXIST)
+ atf_tc_skip("snd_dummy.ko not found");
+}
+
+ATF_TC(sndstat_nv);
+ATF_TC_HEAD(sndstat_nv, tc)
+{
+ atf_tc_set_md_var(tc, "descr", "/dev/sndstat nvlist test");
+}
+
+ATF_TC_BODY(sndstat_nv, tc)
+{
+ 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, rc;
+ int pchan, rchan;
+
+ load_dummy();
+
+ if ((fd = open("/dev/sndstat", O_RDONLY)) < 0)
+ atf_tc_skip("/dev/sndstat not found, load sound(4)");
+
+ rc = ioctl(fd, SNDSTIOC_REFRESH_DEVS, NULL);
+ ATF_REQUIRE_EQ(rc, 0);
+
+ arg.nbytes = 0;
+ arg.buf = NULL;
+ rc = ioctl(fd, SNDSTIOC_GET_DEVS, &arg);
+ ATF_REQUIRE_EQ_MSG(rc, 0, "ioctl(SNDSTIOC_GET_DEVS#1) failed");
+
+ arg.buf = malloc(arg.nbytes);
+ ATF_REQUIRE(arg.buf != NULL);
+
+ rc = ioctl(fd, SNDSTIOC_GET_DEVS, &arg);
+ ATF_REQUIRE_EQ_MSG(rc, 0, "ioctl(SNDSTIOC_GET_DEVS#2) failed");
+
+ nvl = nvlist_unpack(arg.buf, arg.nbytes, 0);
+ ATF_REQUIRE(nvl != NULL);
+
+ if (nvlist_empty(nvl) || !nvlist_exists(nvl, SNDST_DSPS))
+ atf_tc_skip("no soundcards attached");
+
+ di = nvlist_get_nvlist_array(nvl, SNDST_DSPS, &nitems);
+ for (i = 0; i < nitems; i++) {
+#define NV(type, item) do { \
+ ATF_REQUIRE_MSG(nvlist_exists(di[i], SNDST_DSPS_ ## item), \
+ "SNDST_DSPS_" #item " does not exist"); \
+ nvlist_get_ ## type (di[i], SNDST_DSPS_ ## item); \
+} while (0)
+ NV(string, NAMEUNIT);
+ NV(bool, FROM_USER);
+ NV(string, DEVNODE);
+ NV(string, DESC);
+ NV(string, PROVIDER);
+ NV(number, PCHAN);
+ NV(number, RCHAN);
+#undef NV
+
+ /* Cannot asign using the macro. */
+ pchan = nvlist_get_number(di[i], SNDST_DSPS_PCHAN);
+ rchan = nvlist_get_number(di[i], SNDST_DSPS_RCHAN);
+
+ if (pchan && !nvlist_exists(di[i], SNDST_DSPS_INFO_PLAY))
+ atf_tc_fail("playback channel list empty");
+ if (rchan && !nvlist_exists(di[i], SNDST_DSPS_INFO_REC))
+ atf_tc_fail("recording channel list empty");
+
+#define NV(type, mode, item) do { \
+ ATF_REQUIRE_MSG(nvlist_exists(nvlist_get_nvlist(di[i], \
+ SNDST_DSPS_INFO_ ## mode), SNDST_DSPS_INFO_ ## item), \
+ "SNDST_DSPS_INFO_" #item " does not exist"); \
+ nvlist_get_ ## type (nvlist_get_nvlist(di[i], \
+ SNDST_DSPS_INFO_ ## mode), SNDST_DSPS_INFO_ ## item); \
+} while (0)
+ if (pchan) {
+ NV(number, PLAY, MIN_RATE);
+ NV(number, PLAY, MAX_RATE);
+ NV(number, PLAY, FORMATS);
+ NV(number, PLAY, MIN_CHN);
+ NV(number, PLAY, MAX_CHN);
+ }
+ if (rchan) {
+ NV(number, REC, MIN_RATE);
+ NV(number, REC, MAX_RATE);
+ NV(number, REC, FORMATS);
+ NV(number, REC, MIN_CHN);
+ NV(number, REC, MAX_CHN);
+ }
+#undef NV
+
+ /* XXX Do we need to skip the TC? userdevs won't have this list */
+ if (!nvlist_exists(di[i], SNDST_DSPS_PROVIDER_INFO))
+ continue;
+
+#define NV(type, item) do { \
+ ATF_REQUIRE_MSG(nvlist_exists(nvlist_get_nvlist(di[i], \
+ SNDST_DSPS_PROVIDER_INFO), SNDST_DSPS_SOUND4_ ## item), \
+ "SNDST_DSPS_SOUND4_" #item " does not exist"); \
+ nvlist_get_ ## type (nvlist_get_nvlist(di[i], \
+ SNDST_DSPS_PROVIDER_INFO), SNDST_DSPS_SOUND4_ ## item); \
+} while (0)
+ NV(number, UNIT);
+ NV(bool, BITPERFECT);
+ NV(number, PVCHAN);
+ NV(number, RVCHAN);
+#undef NV
+
+ if (!nvlist_exists(nvlist_get_nvlist(di[i],
+ SNDST_DSPS_PROVIDER_INFO), SNDST_DSPS_SOUND4_CHAN_INFO))
+ atf_tc_fail("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) do { \
+ ATF_REQUIRE_MSG(nvlist_exists(cdi[j], SNDST_DSPS_SOUND4_CHAN_ ## item), \
+ "SNDST_DSPS_SOUND4_CHAN_" #item " does not exist"); \
+ nvlist_get_ ## type (cdi[j], SNDST_DSPS_SOUND4_CHAN_ ## item); \
+} while (0)
+ NV(string, NAME);
+ NV(string, PARENTCHAN);
+ NV(number, UNIT);
+ NV(number, LATENCY);
+ NV(number, RATE);
+ NV(number, FORMAT);
+ NV(number, PID);
+ NV(string, COMM);
+ NV(number, INTR);
+ NV(number, XRUNS);
+ NV(number, FEEDCNT);
+ NV(number, LEFTVOL);
+ NV(number, RIGHTVOL);
+ NV(number, HWBUF_FORMAT);
+ NV(number, HWBUF_SIZE);
+ NV(number, HWBUF_BLKSZ);
+ NV(number, HWBUF_BLKCNT);
+ NV(number, HWBUF_FREE);
+ NV(number, HWBUF_READY);
+ NV(number, SWBUF_FORMAT);
+ NV(number, SWBUF_SIZE);
+ NV(number, SWBUF_BLKSZ);
+ NV(number, SWBUF_BLKCNT);
+ NV(number, SWBUF_FREE);
+ NV(number, SWBUF_READY);
+ NV(string, FEEDERCHAIN);
+#undef NV
+ }
+ }
+
+ free(arg.buf);
+ nvlist_destroy(nvl);
+ close(fd);
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+ ATF_TP_ADD_TC(tp, sndstat_nv);
+
+ return (atf_no_error());
+}

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