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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2021 OmniOS Community Edition (OmniOSce) Association.
*/
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/debug.h>
#include <sys/eventfd.h>
#include <unistd.h>
static int
readn(int fd, uint_t n)
{
uint_t i;
int failures = 0;
for (i = 0; i < n; i++) {
eventfd_t v = 0xdeadbeef;
int ret;
ret = eventfd_read(fd, &v);
if (ret != 0) {
warn("Reading %u/%u got ret %d (expected 0)",
i + 1, n, ret);
failures++;
} else if (v != 1) {
warnx("Reading %u/%u got value %"PRIu64" (expected 1)",
i + 1, n, v);
failures++;
}
}
return (failures);
}
static int
check_nosem(int fd)
{
eventfd_t v = 0xdeadbeef;
int failures = 0;
int ret;
ret = eventfd_read(fd, &v);
if (ret != -1) {
warnx("no semaphores read got ret %d (expected -1)", ret);
failures++;
}
if (errno != EAGAIN) {
warn("no semaphores read expected EAGAIN but got");
failures++;
}
if (v != 0xdeadbeef) {
warnx("no semaphores read modified value to %"PRIx64, v);
failures++;
}
return (failures);
}
static int
check_badwrite(int fd)
{
int failures = 0;
int ret;
ret = eventfd_write(fd, ULLONG_MAX);
if (ret != -1) {
warnx("bad write got ret %d (expected -1)", ret);
failures++;
}
if (errno != EINVAL) {
warn("bad write expected EINVAL but got");
failures++;
}
return (failures);
}
int
main(void)
{
int fd, failures = 0;
/* Test eventfd semaphore semantics */
fd = eventfd(2, EFD_NONBLOCK | EFD_CLOEXEC | EFD_SEMAPHORE);
if (fd == -1)
err(EXIT_FAILURE, "Could not create eventfd semaphore");
/* Consume the available semaphores */
failures += readn(fd, 2);
/* The next read should return -1/EAGAIN */
failures += check_nosem(fd);
/* Return two + three semaphores */
if (eventfd_write(fd, 2) != 0) {
warn("Error while returning two semaphores");
failures++;
}
if (eventfd_write(fd, 3) != 0) {
warn("Error while returning three semaphores");
failures++;
}
/* Consume the available semaphores */
failures += readn(fd, 5);
/* The next read should return -1/EAGAIN */
failures += check_nosem(fd);
/*
* Check that a writing too large a value results in an error from
* eventfd_write() - testing that an error from the underlying write()
* is passed back.
*/
failures += check_badwrite(fd);
VERIFY0(close(fd));
return (failures == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
}
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