1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2023 SUSE LLC Andrea Cervesato <[email protected]>
4 */
5
6 /*\
7 * [Description]
8 *
9 * Verify that EPOLLONESHOT is correctly handled by epoll_wait.
10 * We open a channel, write in it two times and verify that EPOLLIN has been
11 * received only once.
12 */
13
14 #include <poll.h>
15 #include <sys/epoll.h>
16 #include "tst_test.h"
17 #include "tst_epoll.h"
18
19 static int fds[2];
20 static int epfd;
21
cleanup(void)22 static void cleanup(void)
23 {
24 if (epfd > 0)
25 SAFE_CLOSE(epfd);
26
27 if (fds[0] > 0)
28 SAFE_CLOSE(fds[0]);
29
30 if (fds[1] > 0)
31 SAFE_CLOSE(fds[1]);
32 }
33
run(void)34 static void run(void)
35 {
36 struct epoll_event evt_receive;
37 char buff = 'a';
38
39 SAFE_PIPE(fds);
40
41 tst_res(TINFO, "Polling on channel with EPOLLONESHOT");
42
43 epfd = SAFE_EPOLL_CREATE1(0);
44
45 SAFE_EPOLL_CTL(epfd, EPOLL_CTL_ADD, fds[0], &((struct epoll_event) {
46 .events = EPOLLIN | EPOLLONESHOT,
47 .data.fd = fds[0],
48 }));
49
50 tst_res(TINFO, "Write channel for the 1st time. EPOLLIN expected");
51
52 SAFE_WRITE(0, fds[1], &buff, 1);
53 TST_EXP_EQ_LI(SAFE_EPOLL_WAIT(epfd, &evt_receive, 10, 0), 1);
54 TST_EXP_EQ_LI(evt_receive.events & EPOLLIN, EPOLLIN);
55 TST_EXP_EQ_LI(evt_receive.data.fd, fds[0]);
56
57 SAFE_READ(1, fds[0], &buff, 1);
58 TST_EXP_EQ_LI(SAFE_EPOLL_WAIT(epfd, &evt_receive, 10, 0), 0);
59
60 tst_res(TINFO, "Write channel for the 2nd time. No events expected");
61
62 SAFE_WRITE(0, fds[1], &buff, 1);
63 TST_EXP_EQ_LI(SAFE_EPOLL_WAIT(epfd, &evt_receive, 10, 0), 0);
64
65 SAFE_CLOSE(epfd);
66 SAFE_CLOSE(fds[0]);
67 SAFE_CLOSE(fds[1]);
68 }
69
70 static struct tst_test test = {
71 .cleanup = cleanup,
72 .test_all = run,
73 };
74