From a0426166811dc81866844fe493adfc4e134b2c3c Mon Sep 17 00:00:00 2001
From: mvs <mvs@openbsd.org>
Date: Thu, 9 Dec 2021 17:42:59 +0000
Subject: [PATCH] Commit 'ungc.c'

---
 regress/sys/kern/unixsockets/ungc.c | 93 +++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 regress/sys/kern/unixsockets/ungc.c

diff --git a/regress/sys/kern/unixsockets/ungc.c b/regress/sys/kern/unixsockets/ungc.c
new file mode 100644
index 00000000000..341d7aa1fd1
--- /dev/null
+++ b/regress/sys/kern/unixsockets/ungc.c
@@ -0,0 +1,93 @@
+/* $OpenBSD: ungc.c,v 1.1 2021/12/09 17:42:59 mvs Exp $ */
+
+/*
+ * Copyright (c) 2021 Vitaliy Makkoveev <mvs@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <sys/un.h>
+#include <stdio.h>
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+union msg_control{
+	struct cmsghdr cmsgh;
+	char control[CMSG_SPACE(sizeof(int)*2)];
+};
+
+int main(int argc, char *argv[])
+{
+	struct timespec ts_start, ts_now, ts_time;
+	union msg_control msg_control;
+	int iov_buf;
+	struct iovec iov;
+	struct msghdr msgh;
+	struct cmsghdr *cmsgh;
+	int s[2];
+	int infinite = 0;
+
+	if (argc > 1 && !strcmp(argv[1], "--infinite"))
+		infinite = 1;
+
+	if (!infinite)
+		if (clock_gettime(CLOCK_BOOTTIME, &ts_start) <0)
+			err(1, "clock_gettime");
+
+	while (1) {
+		if (socketpair(AF_UNIX, SOCK_STREAM|O_NONBLOCK, 0, s) < 0)
+			err(1, "socketpair");
+	
+		iov_buf = 0;
+		iov.iov_base = &iov_buf;
+		iov.iov_len = sizeof(iov_buf);
+		msgh.msg_control = msg_control.control;
+		msgh.msg_controllen = sizeof(msg_control.control);
+		msgh.msg_iov = &iov;
+		msgh.msg_iovlen = 1;
+		msgh.msg_name = NULL;
+		msgh.msg_namelen = 0;
+		cmsgh = CMSG_FIRSTHDR(&msgh);
+		cmsgh->cmsg_len = CMSG_LEN(sizeof(int) * 2);
+		cmsgh->cmsg_level = SOL_SOCKET;
+		cmsgh->cmsg_type = SCM_RIGHTS;
+		*((int *)CMSG_DATA(cmsgh) + 0) = s[0];
+		*((int *)CMSG_DATA(cmsgh) + 1) = s[1];
+
+		if (sendmsg(s[0], &msgh, 0) < 0) {
+			if (errno != EMFILE)
+				err(1, "sendmsg");
+		}
+
+		close(s[0]);
+		close(s[1]);
+
+		if (!infinite) {
+			if (clock_gettime(CLOCK_BOOTTIME, &ts_now) <0)
+				err(1, "clock_gettime");
+
+			timespecsub(&ts_now, &ts_start, &ts_time);
+			if (ts_time.tv_sec >= 20)
+				break;
+		}
+	}
+
+	return 0;
+}
-- 
2.20.1