@@ -182,6 +182,11 @@ epoll_pwait04 epoll_pwait04
epoll_pwait05 epoll_pwait05
eventfd01 eventfd01
+eventfd02 eventfd02
+eventfd03 eventfd03
+eventfd04 eventfd04
+eventfd05 eventfd05
+eventfd06 eventfd06
eventfd2_01 eventfd2_01
eventfd2_02 eventfd2_02
@@ -1 +1,6 @@
/eventfd01
+/eventfd02
+/eventfd03
+/eventfd04
+/eventfd05
+/eventfd06
@@ -1,738 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
- * Copyright (c) 2008 Vijay Kumar B. <vijaykumar@bravegnu.org>
- * Copyright (c) Linux Test Project, 2008-2022
- *
- * Based on testcases/kernel/syscalls/waitpid/waitpid01.c
- * Original copyright message:
- *
- * Copyright (c) International Business Machines Corp., 2001
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
- * the GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ * Copyright (C) 2023 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
*/
/*
- * NAME
- * eventfd01.c
- *
- * DESCRIPTION
- * Test cases for eventfd syscall.
- *
- * USAGE: <for command-line>
- * eventfd01 [-c n] [-i n] [-I x] [-P x] [-t]
- * where, -c n : Run n copies concurrently.
- * -i n : Execute test n times.
- * -I x : Execute test for x seconds.
- * -P x : Pause for x seconds between iterations.
+ * [Description]
*
- * History
- * 07/2008 Vijay Kumar
- * Initial Version.
- *
- * Restrictions
- * None
- */
-
-#include "config.h"
-
-#include <sys/types.h>
-#include <sys/select.h>
-#include <sys/wait.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <inttypes.h>
-#include <poll.h>
-#include <signal.h>
-#include <stdint.h>
-#include <string.h>
-#include <unistd.h>
-
-#include "test.h"
-#define CLEANUP cleanup
-#include "lapi/syscalls.h"
-
-TCID_DEFINE(eventfd01);
-int TST_TOTAL = 15;
-
-#ifdef HAVE_LIBAIO
-#include <libaio.h>
-
-static void setup(void);
-
-static int myeventfd(unsigned int initval, int flags)
-{
- /* eventfd2 uses FLAGS but eventfd doesn't take FLAGS. */
- return tst_syscall(__NR_eventfd, initval);
-}
-
-/*
- * clear_counter() - clears the counter by performing a dummy read
- * @fd: the eventfd
+ * Verify read operation for eventfd fail with:
*
- * RETURNS:
- * 0 on success, and -1 on failure
+ * - EAGAIN when counter is zero on non blocking fd
+ * - EINVAL when buffer size is less than 8 bytes
*/
-static int clear_counter(int fd)
-{
- uint64_t dummy;
- int ret;
- ret = read(fd, &dummy, sizeof(dummy));
- if (ret == -1) {
- if (errno != EAGAIN) {
- tst_resm(TINFO | TERRNO, "error clearing counter");
- return -1;
- }
- }
+#include <stdlib.h>
+#include <sys/eventfd.h>
+#include "tst_test.h"
- return 0;
-}
+#define EVENT_COUNT 10
-/*
- * set_counter() - sets the count to specified value
- * @fd: the eventfd
- * @val: the value to be set
- *
- * Clears the counter and sets the counter to @val.
- *
- * RETURNS:
- * 0 on success, -1 on failure
- */
-static int set_counter(int fd, uint64_t val)
+static void run(void)
{
- int ret;
-
- ret = clear_counter(fd);
- if (ret == -1)
- return -1;
-
- ret = write(fd, &val, sizeof(val));
- if (ret == -1) {
- tst_resm(TINFO | TERRNO, "error setting counter value");
- return -1;
- }
-
- return 0;
-}
-
-/*
- * Test whether the current value of the counter matches @required.
- */
-static void read_test(int fd, uint64_t required)
-{
- int ret;
- uint64_t val;
-
- ret = read(fd, &val, sizeof(val));
- if (ret == -1) {
- tst_resm(TBROK | TERRNO, "error reading eventfd");
- return;
- }
-
- if (val == required)
- tst_resm(TPASS, "counter value matches required");
- else
- tst_resm(TFAIL, "counter value mismatch: "
- "required: %" PRIu64 ", got: %" PRIu64, required, val);
-}
-
-/*
- * Test whether read returns with error EAGAIN when counter is at 0.
- */
-static void read_eagain_test(int fd)
-{
- int ret;
- uint64_t val;
-
- ret = clear_counter(fd);
- if (ret == -1) {
- tst_resm(TBROK, "error clearing counter");
- return;
- }
-
- ret = read(fd, &val, sizeof(val));
- if (ret == -1) {
- if (errno == EAGAIN)
- tst_resm(TPASS, "read failed with EAGAIN as expected");
- else
- tst_resm(TFAIL | TERRNO, "read failed (wanted EAGAIN)");
- } else
- tst_resm(TFAIL, "read returned with %d", ret);
-}
-
-/*
- * Test whether writing to counter works.
- */
-static void write_test(int fd)
-{
- int ret;
- uint64_t val;
-
- val = 12;
-
- ret = set_counter(fd, val);
- if (ret == -1) {
- tst_resm(TBROK, "error setting counter value to %" PRIu64, val);
- return;
- }
-
- read_test(fd, val);
-}
-
-/*
- * Test whether write returns with error EAGAIN when counter is at
- * (UINT64_MAX - 1).
- */
-static void write_eagain_test(int fd)
-{
- int ret;
+ int fd;
uint64_t val;
-
- ret = set_counter(fd, UINT64_MAX - 1);
- if (ret == -1) {
- tst_resm(TBROK, "error setting counter value to UINT64_MAX-1");
- return;
- }
-
- val = 1;
- ret = write(fd, &val, sizeof(val));
- if (ret == -1) {
- if (errno == EAGAIN)
- tst_resm(TPASS, "write failed with EAGAIN as expected");
- else
- tst_resm(TFAIL, "write failed (wanted EAGAIN)");
- } else
- tst_resm(TFAIL, "write returned with %d", ret);
-}
-
-/*
- * Test whether read returns with error EINVAL, if buffer size is less
- * than 8 bytes.
- */
-static void read_einval_test(int fd)
-{
- uint32_t invalid;
- int ret;
-
- ret = read(fd, &invalid, sizeof(invalid));
- if (ret == -1) {
- if (errno == EINVAL)
- tst_resm(TPASS, "read failed with EINVAL as expected");
- else
- tst_resm(TFAIL | TERRNO, "read failed (wanted EINVAL)");
- } else
- tst_resm(TFAIL, "read returned with %d", ret);
-}
-
-/*
- * Test whether write returns with error EINVAL, if buffer size is
- * less than 8 bytes.
- */
-static void write_einval_test(int fd)
-{
uint32_t invalid;
- int ret;
-
- ret = write(fd, &invalid, sizeof(invalid));
- if (ret == -1) {
- if (errno == EINVAL)
- tst_resm(TPASS, "write failed with EINVAL as expected");
- else
- tst_resm(TFAIL | TERRNO,
- "write failed (wanted EINVAL)");
- } else
- tst_resm(TFAIL, "write returned with %d", ret);
-}
-
-/*
- * Test wheter write returns with error EINVAL, when the written value
- * is 0xFFFFFFFFFFFFFFFF.
- */
-static void write_einval2_test(int fd)
-{
- int ret;
- uint64_t val;
-
- ret = clear_counter(fd);
- if (ret == -1) {
- tst_resm(TBROK, "error clearing counter");
- return;
- }
-
- val = 0xffffffffffffffffLL;
- ret = write(fd, &val, sizeof(val));
- if (ret == -1) {
- if (errno == EINVAL)
- tst_resm(TPASS, "write failed with EINVAL as expected");
- else
- tst_resm(TFAIL | TERRNO,
- "write failed (wanted EINVAL)");
- } else {
- tst_resm(TFAIL, "write returned with %d", ret);
- }
-}
-
-/*
- * Test whether readfd is set by select when counter value is
- * non-zero.
- */
-static void readfd_set_test(int fd)
-{
- int ret;
- fd_set readfds;
- struct timeval timeout = { 0, 0 };
- uint64_t non_zero = 10;
-
- FD_ZERO(&readfds);
- FD_SET(fd, &readfds);
-
- ret = set_counter(fd, non_zero);
- if (ret == -1) {
- tst_resm(TBROK, "error setting counter value to %" PRIu64,
- non_zero);
- return;
- }
-
- ret = select(fd + 1, &readfds, NULL, NULL, &timeout);
- if (ret == -1) {
- /* EINTR cannot occur, since we don't block. */
- tst_resm(TBROK | TERRNO, "select() failed");
- return;
- }
-
- if (FD_ISSET(fd, &readfds))
- tst_resm(TPASS, "fd is set in readfds");
- else
- tst_resm(TFAIL, "fd is not set in readfds");
-}
-
-/*
- * Test whether readfd is not set by select when counter value is
- * zero.
- */
-static void readfd_not_set_test(int fd)
-{
- int ret;
- fd_set readfds;
- struct timeval timeout = { 0, 0 };
-
- FD_ZERO(&readfds);
- FD_SET(fd, &readfds);
-
- ret = clear_counter(fd);
- if (ret == -1) {
- tst_resm(TBROK, "error clearing counter");
- return;
- }
-
- ret = select(fd + 1, &readfds, NULL, NULL, &timeout);
- if (ret == -1) {
- /* EINTR cannot occur, since we don't block. */
- tst_resm(TBROK | TERRNO, "select() failed");
- return;
- }
-
- if (!FD_ISSET(fd, &readfds))
- tst_resm(TPASS, "fd is not set in readfds");
- else
- tst_resm(TFAIL, "fd is set in readfds");
-}
-
-/*
- * Test whether writefd is set by select when counter value is not the
- * maximum counter value.
- */
-static void writefd_set_test(int fd)
-{
- int ret;
- fd_set writefds;
- struct timeval timeout = { 0, 0 };
- uint64_t non_max = 10;
-
- FD_ZERO(&writefds);
- FD_SET(fd, &writefds);
-
- ret = set_counter(fd, non_max);
- if (ret == -1) {
- tst_resm(TBROK, "error setting counter value to %" PRIu64,
- non_max);
- return;
- }
-
- ret = select(fd + 1, NULL, &writefds, NULL, &timeout);
- if (ret == -1) {
- /* EINTR cannot occur, since we don't block. */
- tst_resm(TBROK | TERRNO, "select: error getting fd status");
- return;
- }
-
- if (FD_ISSET(fd, &writefds))
- tst_resm(TPASS, "fd is set in writefds");
- else
- tst_resm(TFAIL, "fd is not set in writefds");
-}
-
-/*
- * Test whether writefd is not set by select when counter value is at
- * (UINT64_MAX - 1).
- */
-static void writefd_not_set_test(int fd)
-{
- int ret;
- fd_set writefds;
- struct timeval timeout = { 0, 0 };
-
- FD_ZERO(&writefds);
- FD_SET(fd, &writefds);
-
- ret = set_counter(fd, UINT64_MAX - 1);
- if (ret == -1) {
- tst_resm(TBROK, "error setting counter value to UINT64_MAX-1");
- return;
- }
-
- ret = select(fd + 1, NULL, &writefds, NULL, &timeout);
- if (ret == -1) {
- /* EINTR cannot occur, since we don't block. */
- tst_resm(TBROK | TERRNO, "select: error getting fd status");
- return;
- }
-
- if (!FD_ISSET(fd, &writefds))
- tst_resm(TPASS, "fd is not set in writefds");
- else
- tst_resm(TFAIL, "fd is set in writefds");
-}
-
-/*
- * Test whether counter update in child is reflected in the parent.
- */
-static void child_inherit_test(int fd)
-{
- uint64_t val;
- pid_t cpid;
- int ret;
- int status;
- uint64_t to_parent = 0xdeadbeef;
- uint64_t dummy;
-
- cpid = fork();
- if (cpid == -1)
- tst_resm(TBROK | TERRNO, "fork failed");
- else if (cpid != 0) {
- ret = wait(&status);
- if (ret == -1) {
- tst_resm(TBROK, "error getting child exit status");
- return;
- }
-
- if (WEXITSTATUS(status) == 1) {
- tst_resm(TBROK, "counter value write not "
- "successful in child");
- return;
- }
- ret = read(fd, &val, sizeof(val));
- if (ret == -1) {
- tst_resm(TBROK | TERRNO, "error reading eventfd");
- return;
- }
+ fd = eventfd(EVENT_COUNT, EFD_NONBLOCK);
+ TST_EXP_FD(fd);
- if (val == to_parent)
- tst_resm(TPASS, "counter value write from "
- "child successful");
- else
- tst_resm(TFAIL, "counter value write in child "
- "failed");
- } else {
- /* Child */
- ret = read(fd, &dummy, sizeof(dummy));
- if (ret == -1 && errno != EAGAIN) {
- tst_resm(TWARN | TERRNO, "error clearing counter");
- exit(1);
- }
+ SAFE_READ(0, fd, &val, sizeof(val));
+ TST_EXP_EQ_LI(val, EVENT_COUNT);
- ret = write(fd, &to_parent, sizeof(to_parent));
- if (ret == -1) {
- tst_resm(TWARN | TERRNO, "error writing eventfd");
- exit(1);
- }
+ TST_EXP_FAIL(read(fd, &val, sizeof(val)), EAGAIN);
+ TST_EXP_FAIL(read(fd, &invalid, sizeof(invalid)), EINVAL);
- exit(0);
- }
+ SAFE_CLOSE(fd);
}
-#ifdef HAVE_IO_SET_EVENTFD
-/*
- * Test whether counter overflow is detected and handled correctly.
- *
- * It is not possible to directly overflow the counter using the
- * write() syscall. Overflows occur when the counter is incremented
- * from kernel space, in an irq context, when it is not possible to
- * block the calling thread of execution.
- *
- * The AIO subsystem internally uses eventfd mechanism for
- * notification of completion of read or write requests. In this test
- * we trigger a counter overflow, by setting the counter value to the
- * max possible value initially. When the AIO subsystem notifies
- * through the eventfd counter, the counter overflows.
- *
- * NOTE: If the the counter starts from an initial value of 0, it will
- * take decades for an overflow to occur. But since we set the initial
- * value to the max possible counter value, we are able to cause it to
- * overflow with a single increment.
- *
- * When the counter overflows, the following are tested
- * 1. Check whether POLLERR event occurs in poll() for the eventfd.
- * 2. Check whether readfd_set/writefd_set is set in select() for the
- eventfd.
- * 3. The counter value is UINT64_MAX.
- */
-static int trigger_eventfd_overflow(int evfd, int *fd, io_context_t * ctx)
-{
- int ret;
- struct iocb iocb;
- struct iocb *iocbap[1];
- struct io_event ioev;
- static char buf[4 * 1024];
-
- *ctx = 0;
- ret = io_setup(16, ctx);
- if (ret < 0) {
- errno = -ret;
- if (errno == ENOSYS) {
- tst_brkm(TCONF | TERRNO, cleanup,
- "io_setup(): AIO not supported by kernel");
- }
-
- tst_resm(TINFO | TERRNO, "io_setup error");
- return -1;
- }
-
- *fd = open("testfile", O_RDWR | O_CREAT, 0644);
- if (*fd == -1) {
- tst_resm(TINFO | TERRNO, "open(testfile) failed");
- goto err_io_destroy;
- }
-
- ret = set_counter(evfd, UINT64_MAX - 1);
- if (ret == -1) {
- tst_resm(TINFO, "error setting counter to UINT64_MAX-1");
- goto err_close_file;
- }
-
- io_prep_pwrite(&iocb, *fd, buf, sizeof(buf), 0);
- io_set_eventfd(&iocb, evfd);
-
- iocbap[0] = &iocb;
- ret = io_submit(*ctx, 1, iocbap);
- if (ret < 0) {
- errno = -ret;
- tst_resm(TINFO | TERRNO, "error submitting iocb");
- goto err_close_file;
- }
-
- ret = io_getevents(*ctx, 1, 1, &ioev, NULL);
- if (ret < 0) {
- errno = -ret;
- tst_resm(TINFO | TERRNO, "error waiting for event");
- goto err_close_file;
- }
-
- return 0;
-
-err_close_file:
- close(*fd);
-
-err_io_destroy:
- io_destroy(*ctx);
-
- return -1;
-}
-
-static void cleanup_overflow(int fd, io_context_t ctx)
-{
- close(fd);
- io_destroy(ctx);
-}
-
-static void overflow_select_test(int evfd)
-{
- struct timeval timeout = { 10, 0 };
- fd_set readfds;
- int fd;
- io_context_t ctx;
- int ret;
-
- ret = trigger_eventfd_overflow(evfd, &fd, &ctx);
- if (ret == -1) {
- tst_resm(TBROK, "error triggering eventfd overflow");
- return;
- }
-
- FD_ZERO(&readfds);
- FD_SET(evfd, &readfds);
- ret = select(evfd + 1, &readfds, NULL, NULL, &timeout);
- if (ret == -1)
- tst_resm(TBROK | TERRNO,
- "error getting evfd status with select");
- else {
- if (FD_ISSET(evfd, &readfds))
- tst_resm(TPASS, "read fd set as expected");
- else
- tst_resm(TFAIL, "read fd not set");
- }
- cleanup_overflow(fd, ctx);
-}
-
-static void overflow_poll_test(int evfd)
-{
- struct pollfd pollfd;
- int fd;
- io_context_t ctx;
- int ret;
-
- ret = trigger_eventfd_overflow(evfd, &fd, &ctx);
- if (ret == -1) {
- tst_resm(TBROK, "error triggering eventfd overflow");
- return;
- }
-
- pollfd.fd = evfd;
- pollfd.events = POLLIN;
- pollfd.revents = 0;
- ret = poll(&pollfd, 1, 10000);
- if (ret == -1)
- tst_resm(TBROK | TERRNO, "error getting evfd status with poll");
- else {
- if (pollfd.revents & POLLERR)
- tst_resm(TPASS, "POLLERR occurred as expected");
- else
- tst_resm(TFAIL, "POLLERR did not occur");
- }
- cleanup_overflow(fd, ctx);
-}
-
-static void overflow_read_test(int evfd)
-{
- uint64_t count;
- io_context_t ctx;
- int fd;
- int ret;
-
- ret = trigger_eventfd_overflow(evfd, &fd, &ctx);
- if (ret == -1) {
- tst_resm(TBROK, "error triggering eventfd overflow");
- return;
- }
-
- ret = read(evfd, &count, sizeof(count));
- if (ret == -1)
- tst_resm(TBROK | TERRNO, "error reading eventfd");
- else {
-
- if (count == UINT64_MAX)
- tst_resm(TPASS, "overflow occurred as expected");
- else
- tst_resm(TFAIL, "overflow did not occur");
- }
- cleanup_overflow(fd, ctx);
-}
-#else
-static void overflow_select_test(int evfd)
-{
- tst_resm(TCONF, "eventfd support is not available in AIO subsystem");
-}
-
-static void overflow_poll_test(int evfd)
-{
- tst_resm(TCONF, "eventfd support is not available in AIO subsystem");
-}
-
-static void overflow_read_test(int evfd)
-{
- tst_resm(TCONF, "eventfd support is not available in AIO subsystem");
-}
-#endif
-
-int main(int argc, char **argv)
-{
- int lc;
- int fd;
-
- tst_parse_opts(argc, argv, NULL, NULL);
-
- setup();
-
- for (lc = 0; TEST_LOOPING(lc); lc++) {
- int ret;
- uint64_t einit = 10;
-
- tst_count = 0;
-
- fd = myeventfd(einit, 0);
- if (fd == -1)
- tst_brkm(TBROK | TERRNO, CLEANUP,
- "error creating eventfd");
-
- ret = fcntl(fd, F_SETFL, O_NONBLOCK);
- if (ret == -1)
- tst_brkm(TBROK | TERRNO, CLEANUP,
- "error setting non-block mode");
-
- read_test(fd, einit);
- read_eagain_test(fd);
- write_test(fd);
- write_eagain_test(fd);
- read_einval_test(fd);
- write_einval_test(fd);
- write_einval2_test(fd);
- readfd_set_test(fd);
- readfd_not_set_test(fd);
- writefd_set_test(fd);
- writefd_not_set_test(fd);
- child_inherit_test(fd);
- overflow_select_test(fd);
- overflow_poll_test(fd);
- overflow_read_test(fd);
-
- close(fd);
- }
-
- cleanup();
-
- tst_exit();
-}
-
-static void setup(void)
-{
-
- tst_sig(FORK, DEF_HANDLER, cleanup);
-
- tst_tmpdir();
-
- TEST_PAUSE;
-}
-
-static void cleanup(void)
-{
- tst_rmdir();
-}
-
-#else
-int main(void)
-{
- tst_brkm(TCONF, NULL, "test requires libaio and it's development packages");
-}
-#endif
+static struct tst_test test = {
+ .test_all = run,
+ .needs_kconfigs = (const char *[]) {
+ "CONFIG_EVENTFD",
+ NULL
+ },
+};
new file mode 100644
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2023 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
+ */
+/*\
+ * [Description]
+ *
+ * Verify write operation for eventfd fail with:
+ *
+ * - EAGAIN when counter is zero on non blocking fd
+ * - EINVAL when buffer size is less than 8 bytes, or if an attempt is made to
+ * write the value 0xffffffffffffffff
+ */
+
+#include <stdlib.h>
+#include <sys/eventfd.h>
+#include "tst_test.h"
+
+static void run(void)
+{
+ int fd;
+ uint64_t val = 12;
+ uint64_t buf;
+ uint32_t invalid;
+
+ fd = eventfd(0, EFD_NONBLOCK);
+ TST_EXP_FD(fd);
+
+ SAFE_WRITE(0, fd, &val, sizeof(val));
+ SAFE_READ(0, fd, &buf, sizeof(buf));
+ TST_EXP_EQ_LI(buf, val);
+
+ val = UINT64_MAX - 1;
+ SAFE_WRITE(0, fd, &val, sizeof(val));
+ TST_EXP_FAIL(write(fd, &val, sizeof(val)), EAGAIN);
+ TST_EXP_FAIL(write(fd, &invalid, sizeof(invalid)), EINVAL);
+
+ val = 0xffffffffffffffffLL;
+ TST_EXP_FAIL(write(fd, &val, sizeof(val)), EINVAL);
+
+ SAFE_CLOSE(fd);
+}
+
+static struct tst_test test = {
+ .test_all = run,
+ .needs_kconfigs = (const char *[]) {
+ "CONFIG_EVENTFD",
+ NULL
+ },
+};
new file mode 100644
@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2023 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
+ */
+/*\
+ * [Description]
+ *
+ * Test whether readfd is set by select() when eventfd() counter value is
+ * non-zero, then check if readfd is not set when eventfd() counter value is
+ * zero.
+ */
+
+#include <stdlib.h>
+#include <sys/eventfd.h>
+#include "tst_test.h"
+
+static void run(void)
+{
+ int fd;
+ uint64_t val;
+ fd_set readfds;
+ uint64_t non_zero = 10;
+ struct timeval timeout = { 0, 0 };
+
+ fd = eventfd(0, EFD_NONBLOCK);
+ TST_EXP_FD(fd);
+
+ FD_ZERO(&readfds);
+ FD_SET(fd, &readfds);
+
+ SAFE_WRITE(0, fd, &non_zero, sizeof(non_zero));
+ TEST(select(fd + 1, &readfds, NULL, NULL, &timeout));
+ if (TST_RET == -1)
+ tst_brk(TBROK | TERRNO, "select");
+
+ TST_EXP_EQ_LI(FD_ISSET(fd, &readfds), 1);
+
+ SAFE_READ(0, fd, &val, sizeof(val));
+ TEST(select(fd + 1, &readfds, NULL, NULL, &timeout));
+ if (TST_RET == -1)
+ tst_brk(TBROK | TERRNO, "select");
+
+ TST_EXP_EQ_LI(FD_ISSET(fd, &readfds), 0);
+
+ SAFE_CLOSE(fd);
+}
+
+static struct tst_test test = {
+ .test_all = run,
+ .needs_kconfigs = (const char *[]) {
+ "CONFIG_EVENTFD",
+ NULL
+ },
+};
new file mode 100644
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2023 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
+ */
+/*\
+ * [Description]
+ *
+ * Test whether writefd is set by select() when eventfd() counter value is
+ * not the maximum value, then check if writefd is not set when eventfd()
+ * counter value is maximum value.
+ */
+
+#include <stdlib.h>
+#include <sys/eventfd.h>
+#include "tst_test.h"
+
+static void run(void)
+{
+ int fd;
+ fd_set writefds;
+ uint64_t val;
+ uint64_t non_max = 10;
+ uint64_t max = UINT64_MAX - 1;
+ struct timeval timeout = { 0, 0 };
+
+ fd = eventfd(0, EFD_NONBLOCK);
+ TST_EXP_FD(fd);
+
+ FD_ZERO(&writefds);
+ FD_SET(fd, &writefds);
+
+ SAFE_WRITE(0, fd, &non_max, sizeof(non_max));
+ TEST(select(fd + 1, NULL, &writefds, NULL, &timeout));
+ if (TST_RET == -1)
+ tst_brk(TBROK | TERRNO, "select");
+
+ TST_EXP_EQ_LI(FD_ISSET(fd, &writefds), 1);
+
+ SAFE_READ(0, fd, &val, sizeof(val));
+ SAFE_WRITE(0, fd, &max, sizeof(max));
+
+ TEST(select(fd + 1, NULL, &writefds, NULL, &timeout));
+ if (TST_RET == -1)
+ tst_brk(TBROK | TERRNO, "select");
+
+ TST_EXP_EQ_LI(FD_ISSET(fd, &writefds), 0);
+
+ SAFE_CLOSE(fd);
+}
+
+static struct tst_test test = {
+ .test_all = run,
+ .needs_kconfigs = (const char *[]) {
+ "CONFIG_EVENTFD",
+ NULL
+ },
+};
new file mode 100644
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2023 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
+ */
+/*\
+ * [Description]
+ *
+ * Test whether eventfd() counter update in child is reflected in the parent.
+ */
+
+#include <stdlib.h>
+#include <sys/eventfd.h>
+#include "tst_test.h"
+
+static void run(void)
+{
+ int fd;
+ uint64_t val;
+ uint64_t to_parent = 0xdeadbeef;
+
+ fd = eventfd(0, EFD_NONBLOCK);
+ TST_EXP_FD(fd);
+
+ if (!SAFE_FORK()) {
+ SAFE_WRITE(0, fd, &to_parent, sizeof(to_parent));
+ exit(0);
+ }
+
+ tst_reap_children();
+
+ SAFE_READ(0, fd, &val, sizeof(val));
+ TST_EXP_EQ_LI(val, to_parent);
+
+ SAFE_CLOSE(fd);
+}
+
+static struct tst_test test = {
+ .test_all = run,
+ .forks_child = 1,
+ .needs_kconfigs = (const char *[]) {
+ "CONFIG_EVENTFD",
+ NULL
+ },
+};
new file mode 100644
@@ -0,0 +1,171 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2023 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
+ */
+/*\
+ * [Description]
+ *
+ * Test whether counter overflow is detected and handled correctly.
+ *
+ * It is not possible to directly overflow the counter using the
+ * write() syscall. Overflows occur when the counter is incremented
+ * from kernel space, in an irq context, when it is not possible to
+ * block the calling thread of execution.
+ *
+ * The AIO subsystem internally uses eventfd mechanism for
+ * notification of completion of read or write requests. In this test
+ * we trigger a counter overflow, by setting the counter value to the
+ * max possible value initially. When the AIO subsystem notifies
+ * through the eventfd counter, the counter overflows.
+ *
+ * NOTE: If the counter starts from an initial value of 0, it will
+ * take decades for an overflow to occur. But since we set the initial
+ * value to the max possible counter value, we are able to cause it to
+ * overflow with a single increment.
+ *
+ * When the counter overflows, the following are tested
+ * 1. Check whether POLLERR event occurs in poll() for the eventfd.
+ * 2. Check whether readfd_set/writefd_set is set in select() for the
+ * eventfd.
+ * 3. The counter value is UINT64_MAX.
+ */
+
+#include "tst_test.h"
+
+#ifdef HAVE_LIBAIO
+#ifdef HAVE_IO_SET_EVENTFD
+
+#include <poll.h>
+#include <libaio.h>
+#include <stdlib.h>
+#include <sys/eventfd.h>
+
+#define MAXEVENTS 16
+#define BUFSIZE 1024
+
+static int fd;
+static int evfd;
+static io_context_t ctx;
+
+static void async_write(void)
+{
+ struct iocb iocb;
+ struct iocb *iocbap[1];
+ struct io_event ioev;
+ static char buf[BUFSIZE];
+
+ memset(buf, 1, BUFSIZE);
+
+ io_prep_pwrite(&iocb, fd, buf, sizeof(buf), 0);
+ io_set_eventfd(&iocb, evfd);
+
+ iocbap[0] = &iocb;
+ TEST(io_submit(ctx, 1, iocbap));
+ if (TST_RET < 0)
+ tst_brk(TBROK, "io_submit() failed: %s", tst_strerrno(-TST_RET));
+
+ TEST(io_getevents(ctx, 1, 1, &ioev, NULL));
+ if (TST_RET < 0)
+ tst_brk(TBROK, "io_getevents() failed: %s", tst_strerrno(-TST_RET));
+}
+
+static void clear_counter(void)
+{
+ uint64_t val;
+ uint64_t max = UINT64_MAX - 1;
+
+ TEST(read(evfd, &val, sizeof(val)));
+ if (TST_RET == -1 && TST_ERR != EAGAIN)
+ tst_brk(TBROK | TERRNO, "read");
+
+ SAFE_WRITE(0, evfd, &max, sizeof(max));
+}
+
+static void test_select(void)
+{
+ fd_set readfds;
+ uint64_t count;
+ struct timeval timeout = { 10, 0 };
+
+ clear_counter();
+ async_write();
+
+ FD_ZERO(&readfds);
+ FD_SET(fd, &readfds);
+
+ tst_res(TINFO, "Checking if select() detects counter overflow");
+
+ TEST(select(fd + 1, NULL, &readfds, NULL, &timeout));
+ if (TST_RET == -1)
+ tst_brk(TBROK | TERRNO, "select");
+
+ TST_EXP_EQ_LI(FD_ISSET(fd, &readfds), 1);
+
+ SAFE_READ(0, evfd, &count, sizeof(count));
+ TST_EXP_EQ_LI(count, UINT64_MAX);
+}
+
+static void test_poll(void)
+{
+ uint64_t count;
+ struct pollfd pollfd;
+
+ clear_counter();
+ async_write();
+
+ pollfd.fd = evfd;
+ pollfd.events = POLLIN;
+ pollfd.revents = 0;
+
+ tst_res(TINFO, "Checking if poll() detects counter overflow");
+
+ TEST(poll(&pollfd, 1, 10000));
+ if (TST_RET == -1)
+ tst_brk(TBROK | TERRNO, "poll");
+
+ TST_EXP_EQ_LI(pollfd.revents & POLLERR, POLLERR);
+
+ SAFE_READ(0, evfd, &count, sizeof(count));
+ TST_EXP_EQ_LI(count, UINT64_MAX);
+}
+
+static void setup(void)
+{
+ TEST(io_setup(MAXEVENTS, &ctx));
+ if (TST_RET < 0)
+ tst_brk(TBROK, "io_setup() failed: %s", tst_strerrno(-TST_RET));
+
+ fd = SAFE_OPEN("testfile", O_RDWR | O_CREAT, 0644);
+ evfd = eventfd(0, EFD_NONBLOCK);
+ TST_EXP_FD(evfd);
+}
+
+static void cleanup(void)
+{
+ SAFE_CLOSE(evfd);
+ io_destroy(ctx);
+}
+
+static void run(void)
+{
+ test_select();
+ test_poll();
+}
+
+static struct tst_test test = {
+ .test_all = run,
+ .setup = setup,
+ .cleanup = cleanup,
+ .needs_tmpdir = 1,
+ .needs_kconfigs = (const char *[]) {
+ "CONFIG_EVENTFD",
+ NULL
+ },
+};
+
+#else /* HAVE_IO_SET_EVENTFD */
+TST_TEST_TCONF("eventfd support is not available in AIO subsystem");
+#endif
+#else /* HAVE_LIBAIO */
+TST_TEST_TCONF("libaio is not available");
+#endif