1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 * Copyright (c) 2008 Vijay Kumar B. <[email protected]>
5 * Copyright (c) Linux Test Project, 2008-2022
6 * Copyright (C) 2023 SUSE LLC Andrea Cervesato <[email protected]>
7 */
8
9 /*\
10 * [Description]
11 *
12 * Verify write operation for eventfd fail with:
13 *
14 * - EAGAIN when counter is zero on non blocking fd
15 * - EINVAL when buffer size is less than 8 bytes, or if an attempt is made to
16 * write the value 0xffffffffffffffff
17 */
18
19 #include <stdlib.h>
20 #include <sys/eventfd.h>
21 #include "tst_test.h"
22
run(void)23 static void run(void)
24 {
25 int fd;
26 uint64_t val = 12;
27 uint64_t buf;
28 uint32_t invalid;
29
30 fd = TST_EXP_FD(eventfd(0, EFD_NONBLOCK));
31
32 SAFE_WRITE(0, fd, &val, sizeof(val));
33 SAFE_READ(0, fd, &buf, sizeof(buf));
34 TST_EXP_EQ_LI(buf, val);
35
36 val = UINT64_MAX - 1;
37 SAFE_WRITE(0, fd, &val, sizeof(val));
38 TST_EXP_FAIL(write(fd, &val, sizeof(val)), EAGAIN);
39 TST_EXP_FAIL(write(fd, &invalid, sizeof(invalid)), EINVAL);
40
41 val = 0xffffffffffffffffLL;
42 TST_EXP_FAIL(write(fd, &val, sizeof(val)), EINVAL);
43
44 SAFE_CLOSE(fd);
45 }
46
47 static struct tst_test test = {
48 .test_all = run,
49 .needs_kconfigs = (const char *[]) {
50 "CONFIG_EVENTFD",
51 NULL
52 },
53 };
54