1 /*
2 * Copyright (C) 2015 Cyril Hrubis <chrubis@suse.cz>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc.,
21 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22 */
23
24 #include <stdint.h>
25 #include <limits.h>
26 #include <errno.h>
27 #include <sys/syscall.h>
28 #include <linux/futex.h>
29
30 #include "test.h"
31 #include "safe_macros.h"
32 #include "lapi/futex.h"
33
34 #define DEFAULT_MSEC_TIMEOUT 10000
35
36 futex_t *tst_futexes;
37 unsigned int tst_max_futexes;
38
tst_checkpoint_init(const char * file,const int lineno,void (* cleanup_fn)(void))39 void tst_checkpoint_init(const char *file, const int lineno,
40 void (*cleanup_fn)(void))
41 {
42 int fd;
43 unsigned int page_size;
44
45 if (tst_futexes) {
46 tst_brkm(TBROK, cleanup_fn,
47 "%s: %d checkopoints allready initialized",
48 file, lineno);
49 }
50
51 /*
52 * The parent test process is responsible for creating the temporary
53 * directory and therefore must pass non-zero cleanup (to remove the
54 * directory if something went wrong).
55 *
56 * We cannot do this check unconditionally because if we need to init
57 * the checkpoint from a binary that was started by exec() the
58 * tst_tmpdir_created() will return false because the tmpdir was
59 * created by parent. In this case we expect the subprogram can call
60 * the init as a first function with NULL as cleanup function.
61 */
62 if (cleanup_fn && !tst_tmpdir_created()) {
63 tst_brkm(TBROK, cleanup_fn,
64 "%s:%d You have to create test temporary directory "
65 "first (call tst_tmpdir())", file, lineno);
66 }
67
68 page_size = getpagesize();
69
70 fd = SAFE_OPEN(cleanup_fn, "checkpoint_futex_base_file",
71 O_RDWR | O_CREAT, 0666);
72
73 SAFE_FTRUNCATE(cleanup_fn, fd, page_size);
74
75 tst_futexes = SAFE_MMAP(cleanup_fn, NULL, page_size,
76 PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
77
78 tst_max_futexes = page_size / sizeof(uint32_t);
79
80 SAFE_CLOSE(cleanup_fn, fd);
81 }
82
tst_checkpoint_wait(unsigned int id,unsigned int msec_timeout)83 int tst_checkpoint_wait(unsigned int id, unsigned int msec_timeout)
84 {
85 struct timespec timeout;
86
87 if (id >= tst_max_futexes) {
88 errno = EOVERFLOW;
89 return -1;
90 }
91
92 timeout.tv_sec = msec_timeout/1000;
93 timeout.tv_nsec = (msec_timeout%1000) * 1000000;
94
95 return syscall(SYS_futex, &tst_futexes[id], FUTEX_WAIT,
96 tst_futexes[id], &timeout);
97 }
98
tst_checkpoint_wake(unsigned int id,unsigned int nr_wake,unsigned int msec_timeout)99 int tst_checkpoint_wake(unsigned int id, unsigned int nr_wake,
100 unsigned int msec_timeout)
101 {
102 unsigned int msecs = 0, waked = 0;
103
104 if (id >= tst_max_futexes) {
105 errno = EOVERFLOW;
106 return -1;
107 }
108
109 for (;;) {
110 waked += syscall(SYS_futex, &tst_futexes[id], FUTEX_WAKE,
111 INT_MAX, NULL);
112
113 if (waked == nr_wake)
114 break;
115
116 usleep(1000);
117 msecs++;
118
119 if (msecs >= msec_timeout) {
120 errno = ETIMEDOUT;
121 return -1;
122 }
123 }
124
125 return 0;
126 }
127
tst_safe_checkpoint_wait(const char * file,const int lineno,void (* cleanup_fn)(void),unsigned int id)128 void tst_safe_checkpoint_wait(const char *file, const int lineno,
129 void (*cleanup_fn)(void), unsigned int id)
130 {
131 int ret = tst_checkpoint_wait(id, DEFAULT_MSEC_TIMEOUT);
132
133 if (ret) {
134 tst_brkm(TBROK | TERRNO, cleanup_fn,
135 "%s:%d: tst_checkpoint_wait(%u, %i)",
136 file, lineno, id, DEFAULT_MSEC_TIMEOUT);
137 }
138 }
139
tst_safe_checkpoint_wake(const char * file,const int lineno,void (* cleanup_fn)(void),unsigned int id,unsigned int nr_wake)140 void tst_safe_checkpoint_wake(const char *file, const int lineno,
141 void (*cleanup_fn)(void), unsigned int id,
142 unsigned int nr_wake)
143 {
144 int ret = tst_checkpoint_wake(id, nr_wake, DEFAULT_MSEC_TIMEOUT);
145
146 if (ret) {
147 tst_brkm(TBROK | TERRNO, cleanup_fn,
148 "%s:%d: tst_checkpoint_wake(%u, %u, %i)",
149 file, lineno, id, nr_wake, DEFAULT_MSEC_TIMEOUT);
150 }
151 }
152