1 | /* Test freopen with mmap stdio. |
2 | Copyright (C) 2002-2022 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library 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 the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <stdio.h> |
20 | #include <stdlib.h> |
21 | #include <string.h> |
22 | #include <unistd.h> |
23 | |
24 | #include <support/check.h> |
25 | #include <support/temp_file.h> |
26 | |
27 | static int fd; |
28 | static char *name; |
29 | |
30 | static void |
31 | do_prepare (int argc, char *argv[]) |
32 | { |
33 | fd = create_temp_file (base: "tst-freopen." , filename: &name); |
34 | TEST_VERIFY_EXIT (fd != -1); |
35 | } |
36 | |
37 | #define PREPARE do_prepare |
38 | |
39 | /* Basic tests for freopen. */ |
40 | static void |
41 | do_test_basic (void) |
42 | { |
43 | const char * const test = "Let's test freopen.\n" ; |
44 | char temp[strlen (test) + 1]; |
45 | |
46 | FILE *f = fdopen (fd, "w" ); |
47 | if (f == NULL) |
48 | FAIL_EXIT1 ("fdopen: %m" ); |
49 | |
50 | fputs (test, f); |
51 | fclose (f); |
52 | |
53 | f = fopen (name, "r" ); |
54 | if (f == NULL) |
55 | FAIL_EXIT1 ("fopen: %m" ); |
56 | |
57 | if (fread (ptr: temp, size: 1, n: strlen (test), stream: f) != strlen (test)) |
58 | FAIL_EXIT1 ("fread: %m" ); |
59 | temp [strlen (test)] = '\0'; |
60 | |
61 | if (strcmp (test, temp)) |
62 | FAIL_EXIT1 ("read different string than was written: (%s, %s)" , |
63 | test, temp); |
64 | |
65 | f = freopen (filename: name, modes: "r+" , stream: f); |
66 | if (f == NULL) |
67 | FAIL_EXIT1 ("freopen: %m" ); |
68 | |
69 | if (fseek (f, 0, SEEK_SET) != 0) |
70 | FAIL_EXIT1 ("fseek: %m" ); |
71 | |
72 | if (fread (ptr: temp, size: 1, n: strlen (test), stream: f) != strlen (test)) |
73 | FAIL_EXIT1 ("fread: %m" ); |
74 | temp [strlen (test)] = '\0'; |
75 | |
76 | if (strcmp (test, temp)) |
77 | FAIL_EXIT1 ("read different string than was written: (%s, %s)" , |
78 | test, temp); |
79 | |
80 | fclose (f); |
81 | } |
82 | |
83 | #if defined __GNUC__ && __GNUC__ >= 11 |
84 | /* Force an error to detect incorrectly making freopen a deallocator |
85 | for its last argument via attribute malloc. The function closes |
86 | the stream without deallocating it so either the argument or |
87 | the pointer returned from the function (but not both) can be passed |
88 | to fclose. */ |
89 | #pragma GCC diagnostic push |
90 | #pragma GCC diagnostic error "-Wmismatched-dealloc" |
91 | #endif |
92 | |
93 | /* Verify that freopen returns stream. */ |
94 | static void |
95 | do_test_return_stream (void) |
96 | { |
97 | FILE *f1 = fopen (name, "r" ); |
98 | if (f1 == NULL) |
99 | FAIL_EXIT1 ("fopen: %m" ); |
100 | |
101 | FILE *f2 = freopen (filename: name, modes: "r+" , stream: f1); |
102 | if (f2 == NULL) |
103 | FAIL_EXIT1 ("freopen: %m" ); |
104 | |
105 | /* Verify that freopen isn't declared with the no-argument attribute |
106 | malloc (which could let GCC fold the inequality to false). */ |
107 | if (f1 != f2) |
108 | FAIL_EXIT1 ("freopen returned a different stream" ); |
109 | |
110 | /* This shouldn't trigger -Wmismatched-dealloc. */ |
111 | fclose (f1); |
112 | } |
113 | |
114 | #if defined __GNUC__ && __GNUC__ >= 11 |
115 | /* Pop -Wmismatched-dealloc set to error above. */ |
116 | # pragma GCC diagnostic pop |
117 | #endif |
118 | |
119 | /* Test for BZ#21398, where it tries to freopen stdio after the close |
120 | of its file descriptor. */ |
121 | static void |
122 | do_test_bz21398 (void) |
123 | { |
124 | (void) close (STDIN_FILENO); |
125 | |
126 | FILE *f = freopen (filename: name, modes: "r" , stdin); |
127 | if (f == NULL) |
128 | FAIL_EXIT1 ("freopen: %m" ); |
129 | |
130 | TEST_VERIFY_EXIT (ferror (f) == 0); |
131 | |
132 | char buf[128]; |
133 | char *ret = fgets (s: buf, n: sizeof (buf), stdin); |
134 | TEST_VERIFY_EXIT (ret != NULL); |
135 | TEST_VERIFY_EXIT (ferror (f) == 0); |
136 | } |
137 | |
138 | static int |
139 | do_test (void) |
140 | { |
141 | do_test_basic (); |
142 | do_test_bz21398 (); |
143 | do_test_return_stream (); |
144 | |
145 | return 0; |
146 | } |
147 | |
148 | #include <support/test-driver.c> |
149 | |