1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2016 Fujitsu Ltd.
4 * Author: Xiao Yang <yangx.jy@cn.fujitsu.com>
5 */
6
7/*\
8 * [Description]
9 *
10 * Verify that epoll_ctl() fails with:
11 *
12 * - EBADF if epfd is an invalid fd.
13 * - EPERM if fd does not support epoll.
14 * - EBADF if fd is an invalid fd.
15 * - EINVAL if op is not supported.
16 * - EINVAL if fd is the same as epfd.
17 * - EINVAL if events is NULL.
18 * - ENOENT if fd is not registered with EPOLL_CTL_DEL.
19 * - ENOENT if fd is not registered with EPOLL_CTL_MOD.
20 * - EEXIST if fd is already registered with EPOLL_CTL_ADD.
21 */
22
23#include <poll.h>
24#include <sys/epoll.h>
25
26#include "tst_test.h"
27
28static int epfd;
29static int fd[2], unsupported_fd;
30static int inv = -1;
31
32static struct epoll_event events[2] = {
33	{.events = EPOLLIN},
34	{.events = EPOLLOUT},
35};
36
37static struct testcase {
38	int *epfd;
39	int opt;
40	int *fd;
41	struct epoll_event *event;
42	int exp_err;
43	const char *desc;
44} tc[] = {
45	{&inv, EPOLL_CTL_ADD, &fd[1], &events[1], EBADF, "epfd is an invalid fd"},
46	{&epfd, EPOLL_CTL_ADD, &unsupported_fd, &events[1], EPERM, "fd does not support epoll"},
47	{&epfd, EPOLL_CTL_ADD, &inv, &events[1], EBADF, "fd is an invalid fd"},
48	{&epfd, -1, &fd[1], &events[1], EINVAL, "op is not supported"},
49	{&epfd, EPOLL_CTL_ADD, &epfd, &events[1], EINVAL, "fd is the same as epfd"},
50	{&epfd, EPOLL_CTL_ADD, &fd[1], NULL, EFAULT, "events is NULL"},
51	{&epfd, EPOLL_CTL_DEL, &fd[1], &events[1], ENOENT, "fd is not registered with EPOLL_CTL_DEL"},
52	{&epfd, EPOLL_CTL_MOD, &fd[1], &events[1], ENOENT, "fd is not registered with EPOLL_CTL_MOD"},
53	{&epfd, EPOLL_CTL_ADD, &fd[0], &events[0], EEXIST, "fd is already registered with EPOLL_CTL_ADD"}
54};
55
56static void setup(void)
57{
58	unsupported_fd = SAFE_OPEN(".", O_RDONLY|O_DIRECTORY, 0);
59
60	epfd = epoll_create(2);
61	if (epfd == -1)
62		tst_brk(TBROK | TERRNO, "fail to create epoll instance");
63
64	SAFE_PIPE(fd);
65
66	events[0].data.fd = fd[0];
67	events[1].data.fd = fd[1];
68
69	if (epoll_ctl(epfd, EPOLL_CTL_ADD, fd[0], &events[0]))
70		tst_brk(TBROK | TERRNO, "epoll_ctl(..., EPOLL_CTL_ADD, ...)");
71}
72
73static void cleanup(void)
74{
75	if (epfd)
76		SAFE_CLOSE(epfd);
77
78	if (fd[0])
79		SAFE_CLOSE(fd[0]);
80
81	if (fd[1])
82		SAFE_CLOSE(fd[1]);
83}
84
85static void verify_epoll_ctl(unsigned int n)
86{
87	TST_EXP_FAIL(epoll_ctl(*tc[n].epfd, tc[n].opt, *tc[n].fd, tc[n].event),
88		     tc[n].exp_err, "epoll_ctl(...) if %s", tc[n].desc);
89}
90
91static struct tst_test test = {
92	.tcnt = ARRAY_SIZE(tc),
93	.setup = setup,
94	.cleanup = cleanup,
95	.test = verify_epoll_ctl,
96};
97