1/*
2 * Copyright (C) 2015 Cyril Hrubis <chrubis@suse.cz>
3 *
4 * This program is free software;  you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY;  without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
12 * the GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program;  if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19/*
20 * Check that select() timeouts correctly.
21 */
22#include <unistd.h>
23#include <errno.h>
24#include <sys/time.h>
25#include <sys/types.h>
26#include <fcntl.h>
27
28#include "test.h"
29#include "safe_macros.h"
30
31char *TCID = "select04";
32int TST_TOTAL = 1;
33
34static char *opt_sleep_us;
35
36static option_t opts[] = {
37	{"s:", NULL, &opt_sleep_us},
38	{NULL, NULL, NULL},
39};
40
41static void help(void);
42static void setup(void);
43static void cleanup(void);
44
45static int fds[2];
46
47int main(int ac, char **av)
48{
49	int lc, treshold;
50	long long elapsed_us, sleep_us = 100000;
51	struct timeval timeout;
52	fd_set sfds;
53
54	tst_parse_opts(ac, av, opts, help);
55
56	if (opt_sleep_us) {
57		sleep_us = atoll(opt_sleep_us);
58
59		if (sleep_us == 0) {
60			tst_brkm(TBROK, NULL, "Invalid timeout '%s'",
61			         opt_sleep_us);
62		}
63	}
64
65	treshold = sleep_us / 100 + 20000;
66
67	setup();
68
69	FD_ZERO(&sfds);
70
71	for (lc = 0; TEST_LOOPING(lc); lc++) {
72		FD_SET(fds[0], &sfds);
73		timeout = tst_us_to_timeval(sleep_us);
74
75		tst_timer_start(CLOCK_MONOTONIC);
76		TEST(select(1, &sfds, NULL, NULL, &timeout));
77		tst_timer_stop();
78
79		if (TEST_RETURN != 0) {
80			tst_resm(TFAIL, "select() haven't timeouted ret=%li",
81				 TEST_RETURN);
82			continue;
83		}
84
85		elapsed_us = tst_timer_elapsed_us();
86
87		if (elapsed_us < sleep_us) {
88			tst_resm(TFAIL,
89			         "select() woken up too early %llius, expected %llius",
90				 elapsed_us, sleep_us);
91			continue;
92		}
93
94		if (elapsed_us - sleep_us > treshold) {
95			tst_resm(TFAIL,
96			         "select() slept too long %llius, expected %llius, threshold %i",
97				 elapsed_us, sleep_us, treshold);
98			continue;
99		}
100
101		tst_resm(TPASS, "select() slept %llius, expected %llius, treshold %i",
102		         elapsed_us, sleep_us, treshold);
103	}
104
105	cleanup();
106	tst_exit();
107}
108
109static void setup(void)
110{
111	tst_timer_check(CLOCK_MONOTONIC);
112
113	SAFE_PIPE(NULL, fds);
114}
115
116static void cleanup(void)
117{
118	if (close(fds[0]))
119		tst_resm(TWARN | TERRNO, "close(fds[0]) failed");
120
121	if (close(fds[1]))
122		tst_resm(TWARN | TERRNO, "close(fds[1]) failed");
123}
124
125static void help(void)
126{
127	printf("  -s      select() timeout lenght in us\n");
128}
129