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
|
/* Test freopen cancellation handling.
Copyright (C) 2024 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 <fcntl.h>
#include <mcheck.h>
#include <pthread.h>
#include <semaphore.h>
#include <stdio.h>
#include <stdlib.h>
#include <wchar.h>
#include <support/check.h>
#include <support/file_contents.h>
#include <support/support.h>
#include <support/temp_file.h>
#include <support/test-driver.h>
#include <support/xstdio.h>
#include <support/xthread.h>
#include <support/xunistd.h>
char *file1, *file2, *file3, *fifo;
sem_t sem;
void *
test_rc_to_r (void *p)
{
int ret;
FILE *fp, *fp2;
ret = sem_post (&sem);
TEST_VERIFY_EXIT (ret == 0);
fp = xfopen (file1, "rc");
for (int i = 0; i < 1000000; i++)
{
fgetc (fp);
fseek (fp, 0, SEEK_SET);
}
fp2 = xfopen (file3, "wc");
fputs ("rc_to_r got to freopen", fp2);
xfclose (fp2);
/* Cancellation should occur at some point from here onwards
(possibly leaking memory and file descriptors associated with the
FILE). */
fp = FREOPEN (file2, "r", fp);
TEST_VERIFY_EXIT (fp != NULL);
for (;;)
{
fgetc (fp);
fseek (fp, 0, SEEK_SET);
}
}
void *
test_r_to_rc (void *p)
{
int ret;
FILE *fp;
fp = xfopen (file1, "r");
fp = FREOPEN (fifo, "rc", fp);
TEST_VERIFY_EXIT (fp != NULL);
ret = sem_post (&sem);
TEST_VERIFY_EXIT (ret == 0);
/* No cancellation should occur for I/O on fifo. */
ret = fgetc (fp);
/* At this point, the other thread has called pthread_cancel and
then written a byte to the fifo, so this thread is cancelled at
the next cancellation point. */
TEST_VERIFY (ret == 'x');
xfclose (fp);
fp = xfopen (file3, "wc");
fputs ("r_to_rc got to fclose", fp);
xfclose (fp);
pthread_testcancel ();
FAIL_EXIT1 ("test_r_to_rc not cancelled\n");
}
int
do_test (void)
{
char *temp_dir = support_create_temp_directory ("tst-freopen-cancel");
file1 = xasprintf ("%s/file1", temp_dir);
support_write_file_string (file1, "file1");
add_temp_file (file1);
file2 = xasprintf ("%s/file2", temp_dir);
support_write_file_string (file2, "file2");
add_temp_file (file2);
file3 = xasprintf ("%s/file3", temp_dir);
support_write_file_string (file3, "file3");
add_temp_file (file3);
fifo = xasprintf ("%s/fifo", temp_dir);
xmkfifo (fifo, 0666);
add_temp_file (fifo);
int ret;
pthread_t thr;
void *retval;
/* Test changing to/from c (cancellation disabled). */
verbose_printf ("Testing rc -> r\n");
ret = sem_init (&sem, 0, 0);
TEST_VERIFY_EXIT (ret == 0);
thr = xpthread_create (NULL, test_rc_to_r, NULL);
ret = sem_wait (&sem);
TEST_VERIFY_EXIT (ret == 0);
xpthread_cancel (thr);
ret = pthread_join (thr, &retval);
TEST_COMPARE (ret, 0);
TEST_VERIFY (retval == PTHREAD_CANCELED);
TEST_OPEN_AND_COMPARE_FILE_STRING (file3, "rc_to_r got to freopen");
verbose_printf ("Testing r -> rc\n");
ret = sem_init (&sem, 0, 0);
TEST_VERIFY_EXIT (ret == 0);
thr = xpthread_create (NULL, test_r_to_rc, NULL);
FILE *fp = xfopen (fifo, "w");
ret = sem_wait (&sem);
TEST_VERIFY_EXIT (ret == 0);
/* This call happens while, or before, the other thread is waiting
to read a character from the fifo. It thus verifies that
cancellation does not occur from the fgetc call in that thread
(it should instead occur only in pthread_testcancel call),
because the expected string is only written to file3 after that
thread closes the fifo. */
xpthread_cancel (thr);
fputc ('x', fp);
xfclose (fp);
ret = pthread_join (thr, &retval);
TEST_COMPARE (ret, 0);
TEST_VERIFY (retval == PTHREAD_CANCELED);
TEST_OPEN_AND_COMPARE_FILE_STRING (file3, "r_to_rc got to fclose");
free (temp_dir);
free (file1);
free (file2);
free (file3);
return 0;
}
#include <support/test-driver.c>
|
