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
|
/* Test for select timeout.
Copyright (C) 2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <intprops.h>
#include <support/capture_subprocess.h>
#include <support/check.h>
#include <support/support.h>
#include <support/timespec.h>
#include <support/xunistd.h>
#include <support/xtime.h>
#include <support/xsignal.h>
struct child_args
{
int fds[2][2];
struct timeval tmo;
};
static void
do_test_child (void *clousure)
{
struct child_args *args = (struct child_args *) clousure;
close (args->fds[0][1]);
close (args->fds[1][0]);
fd_set rfds;
FD_ZERO (&rfds);
FD_SET (args->fds[0][0], &rfds);
struct timespec ts = xclock_now (CLOCK_REALTIME);
ts = timespec_add (ts, (struct timespec) { args->tmo.tv_sec, 0 });
int r = select (args->fds[0][0] + 1, &rfds, NULL, NULL, &args->tmo);
TEST_COMPARE (r, 0);
if (support_select_modifies_timeout ())
{
TEST_COMPARE (args->tmo.tv_sec, 0);
TEST_COMPARE (args->tmo.tv_usec, 0);
}
TEST_TIMESPEC_NOW_OR_AFTER (CLOCK_REALTIME, ts);
xwrite (args->fds[1][1], "foo", 3);
}
static void
do_test_child_alarm (void *clousure)
{
struct child_args *args = (struct child_args *) clousure;
support_create_timer (0, 100000000, false, NULL);
struct timeval tv = { .tv_sec = args->tmo.tv_sec, .tv_usec = 0 };
int r = select (0, NULL, NULL, NULL, &tv);
TEST_COMPARE (r, -1);
if (args->tmo.tv_sec > INT_MAX)
TEST_VERIFY (errno == EINTR || errno == EOVERFLOW);
else
{
TEST_COMPARE (errno, EINTR);
if (support_select_modifies_timeout ())
TEST_VERIFY (tv.tv_sec < args->tmo.tv_sec);
}
}
static int
do_test (void)
{
struct child_args args;
xpipe (args.fds[0]);
xpipe (args.fds[1]);
/* The child select should timeout and write on its pipe end. */
args.tmo = (struct timeval) { .tv_sec = 0, .tv_usec = 250000 };
{
struct support_capture_subprocess result;
result = support_capture_subprocess (do_test_child, &args);
support_capture_subprocess_check (&result, "tst-select-child", 0,
sc_allow_none);
}
if (support_select_normalizes_timeout ())
{
/* This is handled as 1 second instead of failing with EINVAL. */
args.tmo = (struct timeval) { .tv_sec = 0, .tv_usec = 1000000 };
struct support_capture_subprocess result;
result = support_capture_subprocess (do_test_child, &args);
support_capture_subprocess_check (&result, "tst-select-child", 0,
sc_allow_none);
}
/* Same as before, but simulating polling. */
args.tmo = (struct timeval) { .tv_sec = 0, .tv_usec = 0 };
{
struct support_capture_subprocess result;
result = support_capture_subprocess (do_test_child, &args);
support_capture_subprocess_check (&result, "tst-select-child", 0,
sc_allow_none);
}
xclose (args.fds[0][0]);
xclose (args.fds[1][1]);
args.tmo = (struct timeval) { .tv_sec = 10, .tv_usec = 0 };
{
struct support_capture_subprocess result;
result = support_capture_subprocess (do_test_child_alarm, &args);
support_capture_subprocess_check (&result, "tst-select-child", 0,
sc_allow_none);
}
args.tmo = (struct timeval) { .tv_sec = TYPE_MAXIMUM (time_t),
.tv_usec = 0 };
{
struct support_capture_subprocess result;
result = support_capture_subprocess (do_test_child_alarm, &args);
support_capture_subprocess_check (&result, "tst-select-child", 0,
sc_allow_none);
}
args.tmo = (struct timeval) { .tv_sec = 0, .tv_usec = 0 };
{
fd_set rfds;
FD_ZERO (&rfds);
FD_SET (args.fds[1][0], &rfds);
int r = select (args.fds[1][0] + 1, &rfds, NULL, NULL, &args.tmo);
TEST_COMPARE (r, 1);
}
return 0;
}
#include <support/test-driver.c>
|
