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authorthorpej <thorpej@NetBSD.org>2021-10-10 17:43:15 +0000
committerthorpej <thorpej@NetBSD.org>2021-10-10 17:43:15 +0000
commit3008191c81ac7be41756e146ef958c5a24e8a0b6 (patch)
tree3a34cc9f1ec2eaeb9052146999ef26479c4df3d4 /tests/kernel/kqueue
parentbb99a516df40917d80571f37761bca74e299f00c (diff)
Add a test case to heavily exercise EVFILT_PROC + NOTE_TRACK.
Diffstat (limited to 'tests/kernel/kqueue')
-rw-r--r--tests/kernel/kqueue/t_proc4.c170
1 files changed, 170 insertions, 0 deletions
diff --git a/tests/kernel/kqueue/t_proc4.c b/tests/kernel/kqueue/t_proc4.c
new file mode 100644
index 00000000000..d5eb6d3e4a3
--- /dev/null
+++ b/tests/kernel/kqueue/t_proc4.c
@@ -0,0 +1,170 @@
+/* $NetBSD: t_proc4.c,v 1.1 2021/10/10 17:43:15 thorpej Exp $ */
+
+/*-
+ * Copyright (c) 2021 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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/cdefs.h>
+__RCSID("$NetBSD: t_proc4.c,v 1.1 2021/10/10 17:43:15 thorpej Exp $");
+
+#include <sys/event.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include <err.h>
+#include <limits.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <atf-c.h>
+
+/* 10 children each create 10 grandchildren. */
+#define TOTAL_CHILDREN 10
+#define TOTAL_GRANDCHILDREN (TOTAL_CHILDREN * TOTAL_CHILDREN)
+#define TOTAL_DESCENDENTS (TOTAL_CHILDREN + TOTAL_GRANDCHILDREN)
+
+#define EXIT_CHILD 66
+#define EXIT_GRANDCHILD 76
+
+static void
+child(void)
+{
+ int i, status;
+ pid_t pid;
+
+ for (i = 0; i < TOTAL_CHILDREN; i++) {
+ ATF_REQUIRE((pid = fork()) != -1);
+ if (pid == 0) {
+ /* grandchild */
+ _exit(EXIT_GRANDCHILD);
+ }
+ }
+
+ for (i = 0; i < TOTAL_CHILDREN; i++) {
+ ATF_REQUIRE((pid = wait(&status)) != -1);
+ }
+ _exit(EXIT_CHILD);
+}
+
+ATF_TC(proc4);
+ATF_TC_HEAD(proc4, tc)
+{
+ atf_tc_set_md_var(tc, "descr", "Exercises EVFILT_PROC + NOTE_TRACK");
+}
+
+ATF_TC_BODY(proc4, tc)
+{
+ int total_tracks = 0;
+ int child_exits = 0;
+ int grandchild_exits = 0;
+ pid_t pid;
+ int kq, status;
+ struct kevent event;
+ struct timespec ts = { 0, 0 };
+ int i, rv;
+
+ ATF_REQUIRE((kq = kqueue()) >= 0);
+
+ EV_SET(&event, getpid(), EVFILT_PROC, EV_ADD,
+ NOTE_TRACK | NOTE_EXIT, 0, 0);
+
+ ATF_REQUIRE(kevent(kq, &event, 1, NULL, 0, NULL) == 0);
+
+ for (i = 0; i < TOTAL_CHILDREN; i++) {
+ ATF_REQUIRE((pid = fork()) != -1);
+ if (pid == 0) {
+ child();
+ /* NOTREACHED */
+ }
+ }
+
+ for (;;) {
+ if (total_tracks == TOTAL_DESCENDENTS &&
+ child_exits == TOTAL_CHILDREN &&
+ grandchild_exits == TOTAL_GRANDCHILDREN) {
+ break;
+ }
+ memset(&event, 0, sizeof(event));
+ rv = kevent(kq, NULL, 0, &event, 1, NULL);
+ ATF_REQUIRE(rv != -1);
+ ATF_REQUIRE(rv == 1);
+ if (event.fflags & NOTE_CHILD) {
+ total_tracks++;
+ ATF_REQUIRE(total_tracks <= TOTAL_DESCENDENTS);
+ } else if (event.fflags & NOTE_EXIT) {
+ ATF_REQUIRE(event.flags & EV_EOF);
+ ATF_REQUIRE(event.data >= 0);
+ ATF_REQUIRE(event.data <= UINT_MAX);
+ status = (int)event.data;
+ ATF_REQUIRE(WIFEXITED(status));
+ ATF_REQUIRE(WEXITSTATUS(status) == EXIT_CHILD ||
+ WEXITSTATUS(status) == EXIT_GRANDCHILD);
+ if (WEXITSTATUS(status) == EXIT_CHILD) {
+ child_exits++;
+ ATF_REQUIRE(child_exits <= TOTAL_CHILDREN);
+ ATF_REQUIRE(wait4((pid_t)event.ident,
+ &status,
+ WNOHANG,
+ NULL) != -1);
+ ATF_REQUIRE(status == (int)event.data);
+ } else {
+ grandchild_exits++;
+ ATF_REQUIRE(grandchild_exits <=
+ TOTAL_GRANDCHILDREN);
+ }
+ } else {
+ /*
+ * We didn't ask for NOTE_FORK, so we don't
+ * expect to ever see it, even though we are
+ * getting NOTE_CHILD as the result of the
+ * NOTE_TRACK.
+ */
+ ATF_REQUIRE((event.fflags & NOTE_FORK) == 0);
+
+ /*
+ * Bomb out of we are getting a TRACKERR.
+ * XXX This could legitimately happen if
+ * the kernel is low on memory because the
+ * code path involved specifically chooses
+ * not to block when allocating memory.
+ */
+ ATF_REQUIRE((event.fflags & NOTE_TRACKERR) == 0);
+ }
+ }
+
+ ATF_REQUIRE(kevent(kq, NULL, 0, &event, 1, &ts) == 0);
+
+ (void)close(kq);
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+ ATF_TP_ADD_TC(tp, proc4);
+
+ return atf_no_error();
+}