1 /*
2 * Copyright (c) International Business Machines Corp., 2001
3 * 07/2001 Ported by Wayne Boyer
4 * Copyright (C) Cyril Hrubis <chrubis@suse.cz>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
14 * the GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /*
22 * Test Description:
23 * Verify that nanosleep() will be successful to suspend the execution
24 * of a process, returns after the receipt of a signal and writes the
25 * remaining sleep time into the structure.
26 */
27
28 #include <errno.h>
29 #include <unistd.h>
30 #include <fcntl.h>
31 #include <signal.h>
32 #include <time.h>
33 #include <sys/wait.h>
34 #include <sys/time.h>
35 #include <stdint.h>
36 #include <inttypes.h>
37
38 #include "test.h"
39
40 char *TCID = "nanosleep02";
41 int TST_TOTAL = 1;
42
43 static void do_child(void);
44 static void setup(void);
45 static void sig_handler();
46
47 /*
48 * Define here the "rem" precision in microseconds,
49 * Various implementations will provide different
50 * precisions. The -aa tree provides up to usec precision.
51 * NOTE: all the trees that don't provide a precision of
52 * the order of the microseconds are subject to an userspace
53 * live lock condition with glibc under a flood of signals,
54 * the "rem" field would never change without the increased
55 * usec precision in the -aa tree.
56 */
57 #define USEC_PRECISION 250000 /* Error margin allowed in usec */
58
main(int ac,char ** av)59 int main(int ac, char **av)
60 {
61 int lc;
62 pid_t cpid;
63
64 tst_parse_opts(ac, av, NULL, NULL);
65
66 #ifdef UCLINUX
67 maybe_run_child(&do_child, "");
68 #endif
69
70 setup();
71
72 for (lc = 0; TEST_LOOPING(lc); lc++) {
73
74 tst_count = 0;
75
76 if ((cpid = FORK_OR_VFORK()) == -1) {
77 tst_brkm(TBROK, NULL,
78 "fork() failed to create child process");
79 }
80
81 if (cpid == 0) {
82 #ifdef UCLINUX
83 if (self_exec(av[0], "")) {
84 tst_brkm(TBROK, NULL, "self_exec failed");
85 }
86 #else
87 do_child();
88 #endif
89 }
90
91 /* wait for child to time slot for execution */
92 sleep(1);
93
94 /* Now send signal to child */
95 if (kill(cpid, SIGINT) < 0) {
96 tst_brkm(TBROK, NULL,
97 "kill() fails send signal to child");
98 }
99
100 tst_record_childstatus(NULL, cpid);
101 }
102
103 tst_exit();
104 }
105
do_child(void)106 static void do_child(void)
107 {
108 struct timespec timereq = {.tv_sec = 5, .tv_nsec = 9999};
109 struct timespec timerem, exp_rem;
110
111 tst_timer_start(CLOCK_MONOTONIC);
112 TEST(nanosleep(&timereq, &timerem));
113 tst_timer_stop();
114
115 if (tst_timespec_lt(timereq, tst_timer_elapsed())) {
116 tst_resm(TFAIL, "nanosleep() slept more than timereq");
117 return;
118 }
119
120 exp_rem = tst_timespec_diff(timereq, tst_timer_elapsed());
121
122 if (tst_timespec_abs_diff_us(timerem, exp_rem) > USEC_PRECISION) {
123 tst_resm(TFAIL,
124 "nanosleep() remaining time %llius, expected %llius, diff %llius",
125 tst_timespec_to_us(timerem), tst_timespec_to_us(exp_rem),
126 tst_timespec_abs_diff_us(timerem, exp_rem));
127 } else {
128 tst_resm(TPASS,
129 "nanosleep() slept for %llius, remaining time difference %llius",
130 tst_timer_elapsed_us(),
131 tst_timespec_abs_diff_us(timerem, exp_rem));
132 }
133
134 tst_exit();
135 }
136
setup(void)137 static void setup(void)
138 {
139 tst_sig(FORK, DEF_HANDLER, NULL);
140
141 tst_timer_check(CLOCK_MONOTONIC);
142
143 TEST_PAUSE;
144
145 if (signal(SIGINT, sig_handler) == SIG_ERR) {
146 tst_brkm(TBROK, NULL,
147 "signal() fails to setup signal handler");
148 }
149 }
150
sig_handler(void)151 static void sig_handler(void)
152 {
153 }
154