Module Name: src
Committed By: thorpej
Date: Mon Dec 14 16:01:38 UTC 2020
Modified Files:
src/tests/lib/libc/sys [thorpej-futex]: Makefile
Added Files:
src/tests/lib/libc/sys [thorpej-futex]: t_eventfd.c
Log Message:
Unit tests for eventfd(2).
To generate a diff of this commit:
cvs rdiff -u -r1.68 -r1.68.2.1 src/tests/lib/libc/sys/Makefile
cvs rdiff -u -r0 -r1.1.2.1 src/tests/lib/libc/sys/t_eventfd.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/tests/lib/libc/sys/Makefile
diff -u src/tests/lib/libc/sys/Makefile:1.68 src/tests/lib/libc/sys/Makefile:1.68.2.1
--- src/tests/lib/libc/sys/Makefile:1.68 Sun Sep 6 07:20:31 2020
+++ src/tests/lib/libc/sys/Makefile Mon Dec 14 16:01:38 2020
@@ -1,4 +1,4 @@
-# $NetBSD: Makefile,v 1.68 2020/09/06 07:20:31 mrg Exp $
+# $NetBSD: Makefile,v 1.68.2.1 2020/12/14 16:01:38 thorpej Exp $
MKMAN= no
@@ -16,6 +16,7 @@ TESTS_C+= t_clock_nanosleep
TESTS_C+= t_clone
TESTS_C+= t_connect
TESTS_C+= t_dup
+TESTS_C+= t_eventfd
TESTS_C+= t_fork
TESTS_C+= t_fsync
TESTS_C+= t_futex_ops
@@ -93,6 +94,7 @@ TESTS_C+= t_write
SRCS.t_mprotect= t_mprotect.c ${SRCS_EXEC_PROT} t_mprotect_helper.c
+LDADD.t_eventfd+= -lpthread
LDADD.t_getpid+= -lpthread
LDADD.t_ptrace_sigchld+= -pthread -lm
Added files:
Index: src/tests/lib/libc/sys/t_eventfd.c
diff -u /dev/null src/tests/lib/libc/sys/t_eventfd.c:1.1.2.1
--- /dev/null Mon Dec 14 16:01:38 2020
+++ src/tests/lib/libc/sys/t_eventfd.c Mon Dec 14 16:01:38 2020
@@ -0,0 +1,834 @@
+/* $NetBSD: t_eventfd.c,v 1.1.2.1 2020/12/14 16:01:38 thorpej Exp $ */
+
+/*-
+ * Copyright (c) 2020 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>
+__COPYRIGHT("@(#) Copyright (c) 2020\
+ The NetBSD Foundation, inc. All rights reserved.");
+__RCSID("$NetBSD: t_eventfd.c,v 1.1.2.1 2020/12/14 16:01:38 thorpej Exp $");
+
+#include <sys/types.h>
+#include <sys/event.h>
+#include <sys/eventfd.h>
+#include <sys/select.h>
+#include <sys/stat.h>
+#include <sys/syscall.h>
+#include <errno.h>
+#include <poll.h>
+#include <pthread.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+#include <unistd.h>
+
+#include <atf-c.h>
+
+struct helper_context {
+ int efd;
+
+ pthread_mutex_t mutex;
+ pthread_cond_t cond;
+ pthread_barrier_t barrier;
+ int state;
+};
+
+static void
+init_helper_context(struct helper_context * const ctx)
+{
+ pthread_condattr_t condattr;
+
+ memset(ctx, 0, sizeof(*ctx));
+
+ ATF_REQUIRE(pthread_mutex_init(&ctx->mutex, NULL) == 0);
+
+ ATF_REQUIRE(pthread_condattr_init(&condattr) == 0);
+ ATF_REQUIRE(pthread_condattr_setclock(&condattr, CLOCK_MONOTONIC) == 0);
+ ATF_REQUIRE(pthread_cond_init(&ctx->cond, &condattr) == 0);
+ ATF_REQUIRE(pthread_condattr_destroy(&condattr) == 0);
+
+ ATF_REQUIRE(pthread_barrier_init(&ctx->barrier, NULL, 2) == 0);
+}
+
+static void
+set_state(struct helper_context * const ctx, int const new)
+{
+ pthread_mutex_lock(&ctx->mutex);
+ ctx->state = new;
+ pthread_cond_signal(&ctx->cond);
+ pthread_mutex_unlock(&ctx->mutex);
+}
+
+static int
+get_state(struct helper_context * const ctx)
+{
+ int rv;
+
+ pthread_mutex_lock(&ctx->mutex);
+ rv = ctx->state;
+ pthread_mutex_unlock(&ctx->mutex);
+
+ return rv;
+}
+
+static bool
+wait_state(struct helper_context * const ctx, int const val)
+{
+ struct timespec deadline;
+ int error;
+ bool rv;
+
+ pthread_mutex_lock(&ctx->mutex);
+
+ ATF_REQUIRE(clock_gettime(CLOCK_MONOTONIC, &deadline) == 0);
+ deadline.tv_sec += 5;
+
+ while (ctx->state != val) {
+ error = pthread_cond_timedwait(&ctx->cond, &ctx->mutex,
+ &deadline);
+ if (error) {
+ break;
+ }
+ }
+ rv = ctx->state == val;
+
+ pthread_mutex_unlock(&ctx->mutex);
+
+ return rv;
+}
+
+static bool
+wait_barrier(struct helper_context * const ctx)
+{
+ int rv = pthread_barrier_wait(&ctx->barrier);
+
+ return rv == 0 || rv == PTHREAD_BARRIER_SERIAL_THREAD;
+}
+
+static int
+my_eventfd(unsigned int val, int flags)
+{
+ return syscall(SYS_eventfd, val, flags);
+}
+
+int
+eventfd_read(int efd, eventfd_t *valp)
+{
+ eventfd_t val;
+
+ switch (read(efd, &val, sizeof(val))) {
+ case -1:
+ return -1;
+
+ case sizeof(val):
+ *valp = val;
+ return 0;
+
+ default:
+ /* ?? Should never happen. */
+ errno = EIO;
+ return -1;
+ }
+}
+
+int
+eventfd_write(int efd, eventfd_t val)
+{
+
+ switch (write(efd, &val, sizeof(val))) {
+ case -1:
+ return -1;
+
+ case sizeof(val):
+ return 0;
+
+ default:
+ /* ?? Should never happen. */
+ errno = EIO;
+ return -1;
+ }
+}
+
+/*****************************************************************************/
+
+static void *
+eventfd_normal_helper(void * const v)
+{
+ struct helper_context * const ctx = v;
+ eventfd_t efd_value;
+
+ ATF_REQUIRE(wait_barrier(ctx));
+
+ /* Read the value. This will reset it to zero. */
+ ATF_REQUIRE(get_state(ctx) == 666);
+ ATF_REQUIRE(eventfd_read(ctx->efd, &efd_value) == 0);
+
+ /* Assert the value. */
+ ATF_REQUIRE(efd_value == 0xcafebabe);
+
+ set_state(ctx, 0);
+
+ /* Wait for the main thread to prep the next test. */
+ ATF_REQUIRE(wait_barrier(ctx));
+
+ /* Read the value. */
+ ATF_REQUIRE(eventfd_read(ctx->efd, &efd_value) == 0);
+
+ /* Assert the value. */
+ ATF_REQUIRE(efd_value == 0xbeefcafe);
+
+ ATF_REQUIRE(wait_barrier(ctx));
+
+ return NULL;
+}
+
+ATF_TC(eventfd_normal);
+ATF_TC_HEAD(eventfd_normal, tc)
+{
+ atf_tc_set_md_var(tc, "descr",
+ "validates basic normal eventfd operation");
+}
+ATF_TC_BODY(eventfd_normal, tc)
+{
+ struct helper_context ctx;
+ pthread_t helper;
+ void *join_val;
+
+ init_helper_context(&ctx);
+
+ ATF_REQUIRE((ctx.efd = my_eventfd(0, 0)) >= 0);
+
+ ATF_REQUIRE(pthread_create(&helper, NULL,
+ eventfd_normal_helper, &ctx) == 0);
+
+ /*
+ * Wait for the helper to block in read(). Give it some time
+ * so that if the read fails or returns immediately, we'll
+ * notice.
+ */
+ set_state(&ctx, 666);
+ ATF_REQUIRE(wait_barrier(&ctx));
+ sleep(2);
+ ATF_REQUIRE(get_state(&ctx) == 666);
+
+ /* Write a distinct value; helper will assert it. */
+ ATF_REQUIRE(eventfd_write(ctx.efd, 0xcafebabe) == 0);
+
+ /* Wait for helper to read the value. */
+ ATF_REQUIRE(wait_state(&ctx, 0));
+
+ /* Helper is now blocked in a barrier. */
+
+ /* Test additive property of the efd value. */
+ ATF_REQUIRE(eventfd_write(ctx.efd, 0x0000cafe) == 0);
+ ATF_REQUIRE(eventfd_write(ctx.efd, 0xbeef0000) == 0);
+
+ /* Satisfy the barrier; helper will read value and assert 0xbeefcafe. */
+ ATF_REQUIRE(wait_barrier(&ctx));
+
+ /* And wait for it to finish. */
+ ATF_REQUIRE(wait_barrier(&ctx));
+
+ /* Reap the helper. */
+ ATF_REQUIRE(pthread_join(helper, &join_val) == 0);
+
+ (void) close(ctx.efd);
+}
+
+/*****************************************************************************/
+
+ATF_TC(eventfd_semaphore);
+ATF_TC_HEAD(eventfd_semaphore, tc)
+{
+ atf_tc_set_md_var(tc, "descr",
+ "validates semaphore and non-blocking eventfd operation");
+}
+ATF_TC_BODY(eventfd_semaphore, tc)
+{
+ eventfd_t efd_value;
+ int efd;
+
+ ATF_REQUIRE((efd = my_eventfd(3, EFD_SEMAPHORE | EFD_NONBLOCK)) >= 0);
+
+ /* 3 reads should succeed without blocking. */
+ ATF_REQUIRE(eventfd_read(efd, &efd_value) == 0);
+ ATF_REQUIRE(efd_value == 1);
+
+ ATF_REQUIRE(eventfd_read(efd, &efd_value) == 0);
+ ATF_REQUIRE(efd_value == 1);
+
+ ATF_REQUIRE(eventfd_read(efd, &efd_value) == 0);
+ ATF_REQUIRE(efd_value == 1);
+
+ /* This one should block. */
+ ATF_REQUIRE_ERRNO(EAGAIN,
+ eventfd_read(efd, &efd_value) == -1);
+
+ /* Add 1 to the semaphore. */
+ ATF_REQUIRE(eventfd_write(efd, 1) == 0);
+
+ /* One more read allowed. */
+ ATF_REQUIRE(eventfd_read(efd, &efd_value) == 0);
+ ATF_REQUIRE(efd_value == 1);
+
+ /* And this one again should block. */
+ ATF_REQUIRE_ERRNO(EAGAIN,
+ eventfd_read(efd, &efd_value) == -1);
+
+ (void) close(efd);
+}
+
+/*****************************************************************************/
+
+ATF_TC(eventfd_select_poll_kevent_immed);
+ATF_TC_HEAD(eventfd_select_poll_kevent_immed, tc)
+{
+ atf_tc_set_md_var(tc, "descr",
+ "validates select/poll/kevent behavior - immediate return");
+}
+ATF_TC_BODY(eventfd_select_poll_kevent_immed, tc)
+{
+ const struct timespec ts = { .tv_sec = 0, .tv_nsec = 0 };
+ struct timeval tv;
+ struct pollfd fds[1];
+ fd_set readfds, writefds, exceptfds;
+ int efd;
+ int kq;
+ struct kevent kev[2];
+
+ ATF_REQUIRE((efd = my_eventfd(0, EFD_NONBLOCK)) >= 0);
+
+ ATF_REQUIRE((kq = kqueue()) >= 0);
+ EV_SET(&kev[0], efd, EVFILT_READ, EV_ADD, 0, 0, NULL);
+ EV_SET(&kev[1], efd, EVFILT_WRITE, EV_ADD, 0, 0, NULL);
+ ATF_REQUIRE(kevent(kq, kev, 2, NULL, 0, &ts) == 0);
+
+ /*
+ * efd should be writable but not readable. Pass all of the
+ * event bits; we should only get back POLLOUT | POLLWRNORM.
+ */
+ fds[0].fd = efd;
+ fds[0].events = POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI |
+ POLLOUT | POLLWRNORM | POLLWRBAND | POLLHUP;
+ fds[0].revents = 0;
+ ATF_REQUIRE(poll(fds, 1, 0) == 1);
+ ATF_REQUIRE(fds[0].revents == (POLLOUT | POLLWRNORM));
+
+ /*
+ * As above; efd should only be set in writefds upon return
+ * from the select() call.
+ */
+ FD_ZERO(&readfds);
+ FD_ZERO(&writefds);
+ FD_ZERO(&exceptfds);
+ tv.tv_sec = 0;
+ tv.tv_usec = 0;
+ FD_SET(efd, &readfds);
+ FD_SET(efd, &writefds);
+ FD_SET(efd, &exceptfds);
+ ATF_REQUIRE(select(efd + 1, &readfds, &writefds, &exceptfds, &tv) == 1);
+ ATF_REQUIRE(!FD_ISSET(efd, &readfds));
+ ATF_REQUIRE(FD_ISSET(efd, &writefds));
+ ATF_REQUIRE(!FD_ISSET(efd, &exceptfds));
+
+ /*
+ * Check that we get an EVFILT_WRITE event (and only that event)
+ * on efd.
+ */
+ memset(kev, 0, sizeof(kev));
+ ATF_REQUIRE(kevent(kq, NULL, 0, kev, 2, &ts) == 1);
+ ATF_REQUIRE(kev[0].ident == (uintptr_t)efd);
+ ATF_REQUIRE(kev[0].filter == EVFILT_WRITE);
+ ATF_REQUIRE((kev[0].flags & (EV_EOF | EV_ERROR)) == 0);
+ ATF_REQUIRE(kev[0].data == 0);
+
+ /*
+ * Write the maximum value into the eventfd. This should result
+ * in the eventfd becoming readable but NOT writable.
+ */
+ ATF_REQUIRE(eventfd_write(efd, UINT64_MAX - 1) == 0);
+
+ fds[0].fd = efd;
+ fds[0].events = POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI |
+ POLLOUT | POLLWRNORM | POLLWRBAND | POLLHUP;
+ fds[0].revents = 0;
+ ATF_REQUIRE(poll(fds, 1, 0) == 1);
+ ATF_REQUIRE(fds[0].revents == (POLLIN | POLLRDNORM));
+
+ FD_ZERO(&readfds);
+ FD_ZERO(&writefds);
+ FD_ZERO(&exceptfds);
+ tv.tv_sec = 0;
+ tv.tv_usec = 0;
+ FD_SET(efd, &readfds);
+ FD_SET(efd, &writefds);
+ FD_SET(efd, &exceptfds);
+ ATF_REQUIRE(select(efd + 1, &readfds, &writefds, &exceptfds, &tv) == 1);
+ ATF_REQUIRE(FD_ISSET(efd, &readfds));
+ ATF_REQUIRE(!FD_ISSET(efd, &writefds));
+ ATF_REQUIRE(!FD_ISSET(efd, &exceptfds));
+
+ /*
+ * Check that we get an EVFILT_READ event (and only that event)
+ * on efd.
+ */
+ memset(kev, 0, sizeof(kev));
+ ATF_REQUIRE(kevent(kq, NULL, 0, kev, 2, &ts) == 1);
+ ATF_REQUIRE(kev[0].ident == (uintptr_t)efd);
+ ATF_REQUIRE(kev[0].filter == EVFILT_READ);
+ ATF_REQUIRE((kev[0].flags & (EV_EOF | EV_ERROR)) == 0);
+ ATF_REQUIRE(kev[0].data == (int64_t)(UINT64_MAX - 1));
+
+ (void) close(kq);
+ (void) close(efd);
+}
+
+/*****************************************************************************/
+
+static void *
+eventfd_select_poll_kevent_block_helper(void * const v)
+{
+ struct helper_context * const ctx = v;
+ struct pollfd fds[1];
+ fd_set selfds;
+ eventfd_t efd_value;
+ int kq;
+ struct kevent kev[1];
+
+ fds[0].fd = ctx->efd;
+ fds[0].events = POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI;
+ fds[0].revents = 0;
+
+ ATF_REQUIRE_ERRNO(EAGAIN,
+ eventfd_read(ctx->efd, &efd_value) == -1);
+
+ ATF_REQUIRE(wait_barrier(ctx));
+
+ ATF_REQUIRE(get_state(ctx) == 666);
+ ATF_REQUIRE(poll(fds, 1, INFTIM) == 1);
+ ATF_REQUIRE(fds[0].revents == (POLLIN | POLLRDNORM));
+ set_state(ctx, 0);
+
+ ATF_REQUIRE(wait_barrier(ctx));
+
+ /*
+ * The maximum value was written to the eventfd, so we
+ * should block waiting for writability.
+ */
+ fds[0].fd = ctx->efd;
+ fds[0].events = POLLOUT | POLLWRNORM;
+ fds[0].revents = 0;
+
+ ATF_REQUIRE_ERRNO(EAGAIN,
+ eventfd_write(ctx->efd, UINT64_MAX - 1) == -1);
+
+ ATF_REQUIRE(wait_barrier(ctx));
+
+ ATF_REQUIRE(get_state(ctx) == 666);
+ ATF_REQUIRE(poll(fds, 1, INFTIM) == 1);
+ ATF_REQUIRE(fds[0].revents == (POLLOUT | POLLWRNORM));
+ set_state(ctx, 0);
+
+ ATF_REQUIRE(wait_barrier(ctx));
+
+ /*
+ * Now, the same dance again, with select().
+ */
+
+ FD_ZERO(&selfds);
+ FD_SET(ctx->efd, &selfds);
+
+ ATF_REQUIRE_ERRNO(EAGAIN,
+ eventfd_read(ctx->efd, &efd_value) == -1);
+
+ ATF_REQUIRE(wait_barrier(ctx));
+
+ ATF_REQUIRE(get_state(ctx) == 666);
+ ATF_REQUIRE(select(ctx->efd + 1, &selfds, NULL, NULL, NULL) == 1);
+ ATF_REQUIRE(FD_ISSET(ctx->efd, &selfds));
+ set_state(ctx, 0);
+
+ ATF_REQUIRE(wait_barrier(ctx));
+
+ FD_ZERO(&selfds);
+ FD_SET(ctx->efd, &selfds);
+
+ ATF_REQUIRE_ERRNO(EAGAIN,
+ eventfd_write(ctx->efd, UINT64_MAX - 1) == -1);
+
+ ATF_REQUIRE(wait_barrier(ctx));
+
+ ATF_REQUIRE(get_state(ctx) == 666);
+ ATF_REQUIRE(select(ctx->efd + 1, NULL, &selfds, NULL, NULL) == 1);
+ ATF_REQUIRE(FD_ISSET(ctx->efd, &selfds));
+ set_state(ctx, 0);
+
+ ATF_REQUIRE(wait_barrier(ctx));
+
+ /*
+ * Now, the same dance again, with kevent().
+ */
+ ATF_REQUIRE((kq = kqueue()) >= 0);
+
+ EV_SET(&kev[0], ctx->efd, EVFILT_READ, EV_ADD | EV_ONESHOT, 0, 0, NULL);
+ ATF_REQUIRE(kevent(kq, kev, 1, NULL, 0, NULL) == 0);
+
+ ATF_REQUIRE_ERRNO(EAGAIN,
+ eventfd_read(ctx->efd, &efd_value) == -1);
+
+ ATF_REQUIRE(wait_barrier(ctx));
+
+ ATF_REQUIRE(get_state(ctx) == 666);
+ ATF_REQUIRE(kevent(kq, NULL, 0, kev, 1, NULL) == 1);
+ ATF_REQUIRE(kev[0].ident == (uintptr_t)ctx->efd);
+ ATF_REQUIRE(kev[0].filter == EVFILT_READ);
+ ATF_REQUIRE((kev[0].flags & (EV_EOF | EV_ERROR)) == 0);
+ ATF_REQUIRE(kev[0].data == (int64_t)(UINT64_MAX - 1));
+ set_state(ctx, 0);
+
+ ATF_REQUIRE(wait_barrier(ctx));
+
+ EV_SET(&kev[0], ctx->efd, EVFILT_WRITE, EV_ADD | EV_ONESHOT, 0, 0,
+ NULL);
+ ATF_REQUIRE(kevent(kq, kev, 1, NULL, 0, NULL) == 0);
+
+ ATF_REQUIRE_ERRNO(EAGAIN,
+ eventfd_write(ctx->efd, UINT64_MAX - 1) == -1);
+
+ ATF_REQUIRE(wait_barrier(ctx));
+
+ ATF_REQUIRE(get_state(ctx) == 666);
+ ATF_REQUIRE(kevent(kq, NULL, 0, kev, 1, NULL) == 1);
+ ATF_REQUIRE(kev[0].ident == (uintptr_t)ctx->efd);
+ ATF_REQUIRE(kev[0].filter == EVFILT_WRITE);
+ ATF_REQUIRE((kev[0].flags & (EV_EOF | EV_ERROR)) == 0);
+ ATF_REQUIRE(kev[0].data == 0);
+ set_state(ctx, 0);
+
+ ATF_REQUIRE(wait_barrier(ctx));
+
+ (void) close(kq);
+
+ return NULL;
+}
+
+ATF_TC(eventfd_select_poll_kevent_block);
+ATF_TC_HEAD(eventfd_select_poll_kevent_block, tc)
+{
+ atf_tc_set_md_var(tc, "descr",
+ "validates select/poll/kevent behavior - return after blocking");
+}
+ATF_TC_BODY(eventfd_select_poll_kevent_block, tc)
+{
+ struct helper_context ctx;
+ pthread_t helper;
+ eventfd_t efd_value;
+ void *join_val;
+
+ init_helper_context(&ctx);
+
+ ATF_REQUIRE((ctx.efd = my_eventfd(0, EFD_NONBLOCK)) >= 0);
+
+ ATF_REQUIRE(pthread_create(&helper, NULL,
+ eventfd_select_poll_kevent_block_helper,
+ &ctx) == 0);
+
+ /*
+ * Wait for the helper to block in poll(). Give it some time
+ * so that if the poll returns immediately, we'll notice.
+ */
+ set_state(&ctx, 666);
+ ATF_REQUIRE(wait_barrier(&ctx));
+ sleep(2);
+ ATF_REQUIRE(get_state(&ctx) == 666);
+
+ /*
+ * Write the max value to the eventfd so that it becomes readable
+ * and unblocks the helper waiting in poll().
+ */
+ ATF_REQUIRE(eventfd_write(ctx.efd, UINT64_MAX - 1) == 0);
+
+ /*
+ * Ensure the helper woke from the poll() call.
+ */
+ ATF_REQUIRE(wait_barrier(&ctx));
+ ATF_REQUIRE(get_state(&ctx) == 0);
+
+ /*
+ * Wait for the helper to block in poll(), this time waiting
+ * for writability.
+ */
+ set_state(&ctx, 666);
+ ATF_REQUIRE(wait_barrier(&ctx));
+ sleep(2);
+ ATF_REQUIRE(get_state(&ctx) == 666);
+
+ /*
+ * Now read the value, which will reset the eventfd to 0 and
+ * unblock the poll() call.
+ */
+ ATF_REQUIRE(eventfd_read(ctx.efd, &efd_value) == 0);
+ ATF_REQUIRE(efd_value == UINT64_MAX - 1);
+
+ /*
+ * Ensure that the helper woke from the poll() call.
+ */
+ ATF_REQUIRE(wait_barrier(&ctx));
+ ATF_REQUIRE(get_state(&ctx) == 0);
+
+ /*
+ * Wait for the helper to block in select(), waiting for readability.
+ */
+ set_state(&ctx, 666);
+ ATF_REQUIRE(wait_barrier(&ctx));
+ sleep(2);
+ ATF_REQUIRE(get_state(&ctx) == 666);
+
+ /*
+ * Write the max value to the eventfd so that it becomes readable
+ * and unblocks the helper waiting in select().
+ */
+ efd_value = UINT64_MAX - 1;
+ ATF_REQUIRE(eventfd_write(ctx.efd, UINT64_MAX - 1) == 0);
+
+ /*
+ * Ensure the helper woke from the select() call.
+ */
+ ATF_REQUIRE(wait_barrier(&ctx));
+ ATF_REQUIRE(get_state(&ctx) == 0);
+
+ /*
+ * Wait for the helper to block in select(), this time waiting
+ * for writability.
+ */
+ set_state(&ctx, 666);
+ ATF_REQUIRE(wait_barrier(&ctx));
+ sleep(2);
+ ATF_REQUIRE(get_state(&ctx) == 666);
+
+ /*
+ * Now read the value, which will reset the eventfd to 0 and
+ * unblock the select() call.
+ */
+ ATF_REQUIRE(eventfd_read(ctx.efd, &efd_value) == 0);
+ ATF_REQUIRE(efd_value == UINT64_MAX - 1);
+
+ /*
+ * Ensure that the helper woke from the select() call.
+ */
+ ATF_REQUIRE(wait_barrier(&ctx));
+ ATF_REQUIRE(get_state(&ctx) == 0);
+
+ /*
+ * Wait for the helper to block in kevent(), waiting for readability.
+ */
+ set_state(&ctx, 666);
+ ATF_REQUIRE(wait_barrier(&ctx));
+ sleep(2);
+ ATF_REQUIRE(get_state(&ctx) == 666);
+
+ /*
+ * Write the max value to the eventfd so that it becomes readable
+ * and unblocks the helper waiting in kevent().
+ */
+ efd_value = UINT64_MAX - 1;
+ ATF_REQUIRE(eventfd_write(ctx.efd, UINT64_MAX - 1) == 0);
+
+ /*
+ * Ensure the helper woke from the kevent() call.
+ */
+ ATF_REQUIRE(wait_barrier(&ctx));
+ ATF_REQUIRE(get_state(&ctx) == 0);
+
+ /*
+ * Wait for the helper to block in kevent(), this time waiting
+ * for writability.
+ */
+ set_state(&ctx, 666);
+ ATF_REQUIRE(wait_barrier(&ctx));
+ sleep(2);
+ ATF_REQUIRE(get_state(&ctx) == 666);
+
+ /*
+ * Now read the value, which will reset the eventfd to 0 and
+ * unblock the select() call.
+ */
+ ATF_REQUIRE(eventfd_read(ctx.efd, &efd_value) == 0);
+ ATF_REQUIRE(efd_value == UINT64_MAX - 1);
+
+ /*
+ * Ensure that the helper woke from the kevent() call.
+ */
+ ATF_REQUIRE(wait_barrier(&ctx));
+ ATF_REQUIRE(get_state(&ctx) == 0);
+
+ /* Reap the helper. */
+ ATF_REQUIRE(pthread_join(helper, &join_val) == 0);
+
+ (void) close(ctx.efd);
+}
+
+/*****************************************************************************/
+
+static void *
+eventfd_restart_helper(void * const v)
+{
+ struct helper_context * const ctx = v;
+ eventfd_t efd_value;
+
+ /*
+ * Issue a single read to ensure that the descriptor is valid.
+ * Thius will not block because it was created with an initial
+ * count of 1.
+ */
+ ATF_REQUIRE(eventfd_read(ctx->efd, &efd_value) == 0);
+ ATF_REQUIRE(efd_value == 1);
+
+ ATF_REQUIRE(wait_barrier(ctx));
+
+ /*
+ * Block in read. The main thread will close the descriptor,
+ * which should unblock us and result in EBADF.
+ */
+ ATF_REQUIRE(get_state(ctx) == 666);
+ ATF_REQUIRE_ERRNO(EBADF, eventfd_read(ctx->efd, &efd_value) == -1);
+ set_state(ctx, 0);
+
+ ATF_REQUIRE(wait_barrier(ctx));
+
+ return NULL;
+}
+
+ATF_TC(eventfd_restart);
+ATF_TC_HEAD(eventfd_restart, tc)
+{
+ atf_tc_set_md_var(tc, "descr",
+ "exercises the 'restart' fileop code path");
+}
+ATF_TC_BODY(eventfd_restart, tc)
+{
+ struct helper_context ctx;
+ pthread_t helper;
+ void *join_val;
+
+ init_helper_context(&ctx);
+
+ ATF_REQUIRE((ctx.efd = my_eventfd(1, 0)) >= 0);
+
+ ATF_REQUIRE(pthread_create(&helper, NULL,
+ eventfd_restart_helper, &ctx) == 0);
+
+ /*
+ * Wait for the helper to block in read(). Give it some time
+ * so that if the poll returns immediately, we'll notice.
+ */
+ set_state(&ctx, 666);
+ ATF_REQUIRE(wait_barrier(&ctx));
+ sleep(2);
+ ATF_REQUIRE(get_state(&ctx) == 666);
+
+ /*
+ * Close the descriptor. This should unblock the reader,
+ * and cause it to receive EBADF.
+ */
+ ATF_REQUIRE(close(ctx.efd) == 0);
+
+ /*
+ * Ensure that the helper woke from the read() call.
+ */
+ ATF_REQUIRE(wait_barrier(&ctx));
+ ATF_REQUIRE(get_state(&ctx) == 0);
+
+ /* Reap the helper. */
+ ATF_REQUIRE(pthread_join(helper, &join_val) == 0);
+}
+
+/*****************************************************************************/
+
+ATF_TC(eventfd_badflags);
+ATF_TC_HEAD(eventfd_badflags, tc)
+{
+ atf_tc_set_md_var(tc, "descr",
+ "validates behavior when eventfd() called with bad flags");
+}
+ATF_TC_BODY(eventfd_badflags, tc)
+{
+ ATF_REQUIRE_ERRNO(EINVAL,
+ my_eventfd(0, ~(EFD_SEMAPHORE | EFD_CLOEXEC | EFD_NONBLOCK)) == -1);
+}
+
+/*****************************************************************************/
+
+ATF_TC(eventfd_bufsize);
+ATF_TC_HEAD(eventfd_bufsize, tc)
+{
+ atf_tc_set_md_var(tc, "descr",
+ "validates expected buffer size behavior");
+}
+ATF_TC_BODY(eventfd_bufsize, tc)
+{
+ eventfd_t efd_value[2];
+ int efd;
+
+ ATF_REQUIRE((efd = my_eventfd(1, EFD_NONBLOCK)) >= 0);
+
+ ATF_REQUIRE_ERRNO(EINVAL,
+ read(efd, efd_value, sizeof(efd_value[0]) - 1) == -1);
+
+ efd_value[0] = 0xdeadbeef;
+ efd_value[1] = 0xdeadbeef;
+ ATF_REQUIRE(read(efd, efd_value, sizeof(efd_value)) ==
+ sizeof(efd_value[0]));
+ ATF_REQUIRE(efd_value[0] == 1);
+ ATF_REQUIRE(efd_value[1] == 0xdeadbeef);
+
+ ATF_REQUIRE_ERRNO(EINVAL,
+ write(efd, efd_value, sizeof(efd_value[0]) - 1) == -1);
+ ATF_REQUIRE(write(efd, efd_value, sizeof(efd_value)) ==
+ sizeof(efd_value[0]));
+
+ ATF_REQUIRE(read(efd, efd_value, sizeof(efd_value)) ==
+ sizeof(efd_value[0]));
+ ATF_REQUIRE(efd_value[0] == 1);
+ ATF_REQUIRE(efd_value[1] == 0xdeadbeef);
+
+ (void) close(efd);
+}
+
+/*****************************************************************************/
+
+ATF_TP_ADD_TCS(tp)
+{
+ ATF_TP_ADD_TC(tp, eventfd_normal);
+ ATF_TP_ADD_TC(tp, eventfd_semaphore);
+ ATF_TP_ADD_TC(tp, eventfd_badflags);
+ ATF_TP_ADD_TC(tp, eventfd_bufsize);
+ ATF_TP_ADD_TC(tp, eventfd_select_poll_kevent_immed);
+ ATF_TP_ADD_TC(tp, eventfd_select_poll_kevent_block);
+ ATF_TP_ADD_TC(tp, eventfd_restart);
+
+ return atf_no_error();
+}
