1 /*
2 * Copyright (C) 2015 Cyril Hrubis <chrubis@suse.cz>
3 *
4 * Licensed under the GNU GPLv2 or later.
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19 /*
20 * Block on a futex and wait for wakeup.
21 *
22 * This tests uses shared memory page to store the mutex variable.
23 */
24
25 #include <sys/mman.h>
26 #include <sys/wait.h>
27 #include <errno.h>
28
29 #include "test.h"
30 #include "safe_macros.h"
31 #include "futextest.h"
32
33 const char *TCID="futex_wait02";
34 const int TST_TOTAL=1;
35
36 static futex_t *futex;
37
do_child(void)38 static void do_child(void)
39 {
40 int ret;
41
42 tst_process_state_wait2(getppid(), 'S');
43
44 ret = futex_wake(futex, 1, 0);
45
46 if (ret != 1)
47 tst_brkm(TFAIL, NULL, "futex_wake() returned %i", ret);
48
49 exit(TPASS);
50 }
51
verify_futex_wait(void)52 static void verify_futex_wait(void)
53 {
54 int res;
55 int pid;
56
57 pid = tst_fork();
58
59 switch (pid) {
60 case 0:
61 do_child();
62 break;
63 case -1:
64 tst_brkm(TBROK | TERRNO, NULL, "fork() failed");
65 break;
66 default:
67 break;
68 }
69
70 res = futex_wait(futex, *futex, NULL, 0);
71
72 if (res) {
73 tst_resm(TFAIL, "futex_wait() returned %i, errno %s",
74 res, tst_strerrno(errno));
75 }
76
77 SAFE_WAIT(NULL, &res);
78
79 if (WIFEXITED(res) && WEXITSTATUS(res) == TPASS)
80 tst_resm(TPASS, "futex_wait() woken up");
81 else
82 tst_resm(TFAIL, "child failed");
83 }
84
setup(void)85 static void setup(void)
86 {
87 futex = SAFE_MMAP(NULL, NULL, sizeof(*futex), PROT_READ | PROT_WRITE,
88 MAP_ANONYMOUS | MAP_SHARED, -1, 0);
89
90 *futex = FUTEX_INITIALIZER;
91 }
92
main(int argc,char * argv[])93 int main(int argc, char *argv[])
94 {
95 int lc;
96
97 tst_parse_opts(argc, argv, NULL, NULL);
98
99 setup();
100
101 for (lc = 0; TEST_LOOPING(lc); lc++)
102 verify_futex_wait();
103
104 tst_exit();
105 }
106