1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
|
// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <asm/unistd.h>
#include <linux/time_types.h>
#include <unistd.h>
#include <assert.h>
#include <signal.h>
#include <pthread.h>
#include <sys/epoll.h>
#include <sys/eventfd.h>
#include "../../kselftest_harness.h"
struct error {
int code;
char msg[512];
};
static int error_set(struct error *err, int code, const char *fmt, ...)
{
va_list args;
int r;
if (code == 0 || !err || err->code != 0)
return code;
err->code = code;
va_start(args, fmt);
r = vsnprintf(err->msg, sizeof(err->msg), fmt, args);
assert((size_t)r < sizeof(err->msg));
va_end(args);
return code;
}
static inline int sys_eventfd2(unsigned int count, int flags)
{
return syscall(__NR_eventfd2, count, flags);
}
TEST(eventfd01)
{
int fd, flags;
fd = sys_eventfd2(0, 0);
ASSERT_GE(fd, 0);
flags = fcntl(fd, F_GETFL);
// since the kernel automatically added O_RDWR.
EXPECT_EQ(flags, O_RDWR);
close(fd);
}
TEST(eventfd02)
{
int fd, flags;
fd = sys_eventfd2(0, EFD_CLOEXEC);
ASSERT_GE(fd, 0);
flags = fcntl(fd, F_GETFD);
ASSERT_GT(flags, -1);
EXPECT_EQ(flags, FD_CLOEXEC);
close(fd);
}
TEST(eventfd03)
{
int fd, flags;
fd = sys_eventfd2(0, EFD_NONBLOCK);
ASSERT_GE(fd, 0);
flags = fcntl(fd, F_GETFL);
ASSERT_GT(flags, -1);
EXPECT_EQ(flags & EFD_NONBLOCK, EFD_NONBLOCK);
EXPECT_EQ(flags & O_RDWR, O_RDWR);
close(fd);
}
TEST(eventfd04)
{
int fd, flags;
fd = sys_eventfd2(0, EFD_CLOEXEC|EFD_NONBLOCK);
ASSERT_GE(fd, 0);
flags = fcntl(fd, F_GETFL);
ASSERT_GT(flags, -1);
EXPECT_EQ(flags & EFD_NONBLOCK, EFD_NONBLOCK);
EXPECT_EQ(flags & O_RDWR, O_RDWR);
flags = fcntl(fd, F_GETFD);
ASSERT_GT(flags, -1);
EXPECT_EQ(flags, FD_CLOEXEC);
close(fd);
}
static inline void trim_newline(char *str)
{
char *pos = strrchr(str, '\n');
if (pos)
*pos = '\0';
}
static int verify_fdinfo(int fd, struct error *err, const char *prefix,
size_t prefix_len, const char *expect, ...)
{
char buffer[512] = {0, };
char path[512] = {0, };
va_list args;
FILE *f;
char *line = NULL;
size_t n = 0;
int found = 0;
int r;
va_start(args, expect);
r = vsnprintf(buffer, sizeof(buffer), expect, args);
assert((size_t)r < sizeof(buffer));
va_end(args);
snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd);
f = fopen(path, "re");
if (!f)
return error_set(err, -1, "fdinfo open failed for %d", fd);
while (getline(&line, &n, f) != -1) {
char *val;
if (strncmp(line, prefix, prefix_len))
continue;
found = 1;
val = line + prefix_len;
r = strcmp(val, buffer);
if (r != 0) {
trim_newline(line);
trim_newline(buffer);
error_set(err, -1, "%s '%s' != '%s'",
prefix, val, buffer);
}
break;
}
free(line);
fclose(f);
if (found == 0)
return error_set(err, -1, "%s not found for fd %d",
prefix, fd);
return 0;
}
TEST(eventfd05)
{
struct error err = {0};
int fd, ret;
fd = sys_eventfd2(0, EFD_SEMAPHORE);
ASSERT_GE(fd, 0);
ret = fcntl(fd, F_GETFL);
ASSERT_GT(ret, -1);
EXPECT_EQ(ret & O_RDWR, O_RDWR);
// The semaphore could only be obtained from fdinfo.
ret = verify_fdinfo(fd, &err, "eventfd-semaphore: ", 19, "1\n");
if (ret != 0)
ksft_print_msg("eventfd-semaphore check failed, msg: %s\n",
err.msg);
EXPECT_EQ(ret, 0);
close(fd);
}
TEST_HARNESS_MAIN
|
