1 /*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <stdio_ext.h>
18
19 #include <gtest/gtest.h>
20
21 #include <errno.h>
22 #include <fcntl.h>
23 #include <limits.h>
24 #include <math.h>
25 #include <stdio.h>
26 #include <sys/types.h>
27 #include <sys/stat.h>
28 #include <unistd.h>
29 #include <wchar.h>
30 #include <locale.h>
31
32 #include "TemporaryFile.h"
33 #include "utils.h"
34
TEST(stdio_ext,__fbufsize)35 TEST(stdio_ext, __fbufsize) {
36 FILE* fp = fopen("/proc/version", "r");
37
38 // Initially, there's no buffer in case the first thing you do is disable buffering.
39 ASSERT_EQ(0U, __fbufsize(fp));
40
41 // A read forces a buffer to be created.
42 char buf[128];
43 fgets(buf, sizeof(buf), fp);
44 ASSERT_EQ(1024U, __fbufsize(fp));
45
46 ASSERT_EQ(0, setvbuf(fp, buf, _IOFBF, 1));
47 ASSERT_EQ(1U, __fbufsize(fp));
48
49 ASSERT_EQ(0, setvbuf(fp, buf, _IOFBF, 8));
50 ASSERT_EQ(8U, __fbufsize(fp));
51
52 fclose(fp);
53 }
54
TEST(stdio_ext,__flbf)55 TEST(stdio_ext, __flbf) {
56 FILE* fp = fopen("/proc/version", "r");
57
58 ASSERT_FALSE(__flbf(fp));
59
60 char buf[128];
61 ASSERT_EQ(0, setvbuf(fp, buf, _IOLBF, sizeof(buf)));
62
63 ASSERT_TRUE(__flbf(fp));
64
65 fclose(fp);
66 }
67
TEST(stdio_ext,__fpending)68 TEST(stdio_ext, __fpending) {
69 FILE* fp = fopen("/dev/null", "w");
70 ASSERT_EQ(0U, __fpending(fp));
71 ASSERT_EQ('x', fputc('x', fp));
72 ASSERT_EQ(1U, __fpending(fp));
73 ASSERT_EQ('y', fputc('y', fp));
74 ASSERT_EQ(2U, __fpending(fp));
75 fflush(fp);
76 ASSERT_EQ(0U, __fpending(fp));
77 fclose(fp);
78 }
79
TEST(stdio_ext,__fpurge)80 TEST(stdio_ext, __fpurge) {
81 FILE* fp = tmpfile();
82
83 ASSERT_EQ('a', fputc('a', fp));
84 ASSERT_EQ(1U, __fpending(fp));
85 __fpurge(fp);
86 ASSERT_EQ(0U, __fpending(fp));
87
88 ASSERT_EQ('b', fputc('b', fp));
89 ASSERT_EQ('\n', fputc('\n', fp));
90 ASSERT_EQ(2U, __fpending(fp));
91
92 rewind(fp);
93
94 char buf[16];
95 char* s = fgets(buf, sizeof(buf), fp);
96 ASSERT_TRUE(s != NULL);
97 ASSERT_STREQ("b\n", s);
98
99 fclose(fp);
100 }
101
TEST(stdio_ext,_flushlbf)102 TEST(stdio_ext, _flushlbf) {
103 FILE* fp = fopen("/dev/null", "w");
104
105 char buf[128];
106 ASSERT_EQ(0, setvbuf(fp, buf, _IOLBF, sizeof(buf)));
107
108 ASSERT_EQ('a', fputc('a', fp));
109 ASSERT_EQ(1U, __fpending(fp));
110
111 _flushlbf();
112
113 ASSERT_EQ(0U, __fpending(fp));
114
115 fclose(fp);
116 }
117
TEST(stdio_ext,__freadable__fwritable)118 TEST(stdio_ext, __freadable__fwritable) {
119 FILE* fp = fopen("/dev/null", "r");
120 ASSERT_TRUE(__freadable(fp));
121 ASSERT_FALSE(__fwritable(fp));
122 fclose(fp);
123
124 fp = fopen("/dev/null", "w");
125 ASSERT_FALSE(__freadable(fp));
126 ASSERT_TRUE(__fwritable(fp));
127 fclose(fp);
128
129 fp = fopen("/dev/null", "w+");
130 ASSERT_TRUE(__freadable(fp));
131 ASSERT_TRUE(__fwritable(fp));
132 fclose(fp);
133 }
134
TEST(stdio_ext,__fsetlocking)135 TEST(stdio_ext, __fsetlocking) {
136 FILE* fp = fopen("/proc/version", "r");
137 ASSERT_EQ(FSETLOCKING_INTERNAL, __fsetlocking(fp, FSETLOCKING_QUERY));
138 ASSERT_EQ(FSETLOCKING_INTERNAL, __fsetlocking(fp, FSETLOCKING_BYCALLER));
139 ASSERT_EQ(FSETLOCKING_BYCALLER, __fsetlocking(fp, FSETLOCKING_QUERY));
140 ASSERT_EQ(FSETLOCKING_BYCALLER, __fsetlocking(fp, FSETLOCKING_INTERNAL));
141 ASSERT_EQ(FSETLOCKING_INTERNAL, __fsetlocking(fp, FSETLOCKING_QUERY));
142 fclose(fp);
143 }
144
LockingByCallerHelper(std::atomic<pid_t> * pid)145 static void LockingByCallerHelper(std::atomic<pid_t>* pid) {
146 *pid = gettid();
147 flockfile(stdout);
148 funlockfile(stdout);
149 }
150
TEST(stdio_ext,__fsetlocking_BYCALLER)151 TEST(stdio_ext, __fsetlocking_BYCALLER) {
152 // Check if users can use flockfile/funlockfile to protect stdio operations.
153 int old_state = __fsetlocking(stdout, FSETLOCKING_BYCALLER);
154 flockfile(stdout);
155 pthread_t thread;
156 std::atomic<pid_t> pid(0);
157 ASSERT_EQ(0, pthread_create(&thread, nullptr,
158 reinterpret_cast<void* (*)(void*)>(LockingByCallerHelper), &pid));
159 WaitUntilThreadSleep(pid);
160 funlockfile(stdout);
161
162 ASSERT_EQ(0, pthread_join(thread, nullptr));
163 __fsetlocking(stdout, old_state);
164 }
165