1 files changed, 176 insertions, 0 deletions
diff --git a/tools/test/stress2/misc/kevent17.sh b/tools/test/stress2/misc/kevent17.sh
new file mode 100755
index 000000000000..e7b8f1a0a00c
--- /dev/null
+++ b/tools/test/stress2/misc/kevent17.sh
@@ -0,0 +1,176 @@
+#!/bin/sh
+
+#
+# Copyright (c) 2025 Peter Holm <pho@FreeBSD.org>
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+
+# A kqueuex(KQUEUE_CPONFORK) test scenario
+# Test scenario suggestion by: kib
+
+. ../default.cfg
+[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
+
+dir=/tmp
+odir=`pwd`
+prog=$(basename "$0" .sh)
+cd $dir
+sed '1,/^EOF/d' < $odir/$0 > $dir/$prog.c
+mycc -o $prog -Wall -Wextra -O0 -g $prog.c || exit 1
+rm -f $prog.c
+cd $odir
+
+set -e
+mount | grep "on $mntpoint " | grep -q /dev/md && umount -f $mntpoint
+[ -c /dev/md$mdstart ] &&  mdconfig -d -u $mdstart
+mdconfig -a -t swap -s 2g -u $mdstart
+newfs $newfs_flags md$mdstart > /dev/null
+mount /dev/md$mdstart $mntpoint
+set +e
+
+(cd $odir/../testcases/swap; ./swap -t 5m -i 20 -h -l 100 > /dev/null) &
+cd $mntpoint
+$dir/$prog
+s=$?
+[ -f $prog.core -a $s -eq 0 ] &&
+    { ls -l $prog.core; mv $prog.core /tmp; s=1; }
+cd $odir
+while pkill -9 swap; do :; done
+wait
+
+for i in `jot 6`; do
+	mount | grep -q "on $mntpoint " || break
+	umount $mntpoint && break || sleep 10
+done
+[ $i -eq 6 ] && exit 1
+mdconfig -d -u $mdstart
+rm -rf $dir/$prog
+exit $s
+
+EOF
+#include <sys/param.h>
+#include <sys/event.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+
+#include <machine/atomic.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+static volatile u_int *share;
+static int  loops;
+static char *file = "file";
+
+#define MAXLOOPS 100
+#define PARALLEL 1
+#define RUNTIME (2 * 60)
+#define SYNC 0
+
+static void
+test(void)
+{
+	pid_t pid;
+        struct kevent ev[2];
+        struct timespec ts;
+        int kq, fd, n;
+
+	if ((fd = open(file, O_RDONLY, 0)) == -1)
+		err(1, "open(%s). %s:%d", file, __func__, __LINE__);
+
+	atomic_add_int(&share[SYNC], 1);
+	while (share[SYNC] != PARALLEL)
+		usleep(10000);
+
+	if ((kq = kqueuex(KQUEUE_CPONFORK)) < 0)
+		err(1, "kqueuex");
+
+	ts.tv_sec  = 5;
+	ts.tv_nsec = 0;
+	n = 0;
+	EV_SET(&ev[n], fd, EVFILT_VNODE, EV_ADD | EV_ENABLE | EV_CLEAR,
+		NOTE_DELETE, 0, 0);
+	n++;
+
+	if (kevent(kq, ev, n, NULL, 0, NULL) < 0)
+		err(1, "kevent()");
+	if (loops >= MAXLOOPS) {	/* start using fork(2) */
+		if ((pid = fork()) == 0) {
+			n = kevent(kq, NULL, 0, ev, 1, &ts);
+			if (n == -1)
+				err(1, "kevent() in fork\n");
+			close(fd);
+			close(kq);
+			_exit(0);
+		}
+		if (waitpid(pid, NULL, 0) != pid)
+			err(1, "waitpid(%d)\n", pid);
+	}
+
+	n = kevent(kq, NULL, 0, ev, 1, &ts);
+	if (n == -1)
+		err(1, "kevent()");
+	close(fd);
+	close(kq);
+
+	_exit(0);
+}
+
+int
+main(void)
+{
+	pid_t pids[PARALLEL];
+	size_t len;
+	time_t start;
+	int e, fd, i, status;
+
+	e = 0;
+	len = PAGE_SIZE;
+	loops = 0;
+	if ((share = mmap(NULL, len, PROT_READ | PROT_WRITE,
+	    MAP_ANON | MAP_SHARED, -1, 0)) == MAP_FAILED)
+		err(1, "mmap");
+
+	start = time(NULL);
+	while ((time(NULL) - start) < RUNTIME && e == 0) {
+		loops++;
+		if ((fd = open(file, O_CREAT | O_TRUNC | O_RDWR, 0660)) ==
+		    -1)
+			err(1, "open(%s)", file);
+		close(fd);
+		share[SYNC] = 0;
+		for (i = 0; i < PARALLEL; i++) {
+
+			if ((pids[i] = fork()) == 0)
+				test();
+			if (pids[i] == -1)
+				err(1, "fork()");
+		}
+		while (share[SYNC] != PARALLEL)
+			usleep(10000);
+		if (unlink(file) == -1)
+			err(1, "unlink(%s). %s:%d\n", file,
+				    __FILE__, __LINE__);
+		for (i = 0; i < PARALLEL; i++) {
+			if (waitpid(pids[i], &status, 0) == -1)
+				err(1, "waitpid(%d)", pids[i]);
+			if (status != 0) {
+				if (WIFSIGNALED(status))
+					fprintf(stderr,
+					    "pid %d exit signal %d\n",
+					    pids[i], WTERMSIG(status));
+			}
+			e += status == 0 ? 0 : 1;
+		}
+	}
+
+	return (e);
+}