unistd_test.cpp revision 9f525644df99cb2f7f81a23ca23840f0a8f82275 
1/*
2 * Copyright (C) 2012 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 <gtest/gtest.h>
18#include "ScopedSignalHandler.h"
19#include "TemporaryFile.h"
20
21#include <errno.h>
22#include <fcntl.h>
23#include <stdint.h>
24#include <unistd.h>
25
26TEST(unistd, sysconf_SC_MONOTONIC_CLOCK) {
27  ASSERT_GT(sysconf(_SC_MONOTONIC_CLOCK), 0);
28}
29
30TEST(unistd, sbrk) {
31  void* initial_break = sbrk(0);
32
33  void* new_break = reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(initial_break) + 2000);
34  ASSERT_EQ(0, brk(new_break));
35
36  void* final_break = sbrk(0);
37  ASSERT_EQ(final_break, new_break);
38}
39
40TEST(unistd, truncate) {
41  TemporaryFile tf;
42  ASSERT_EQ(0, close(tf.fd));
43  ASSERT_EQ(0, truncate(tf.filename, 123));
44
45  struct stat sb;
46  ASSERT_EQ(0, stat(tf.filename, &sb));
47  ASSERT_EQ(123, sb.st_size);
48}
49
50TEST(unistd, truncate64) {
51  TemporaryFile tf;
52  ASSERT_EQ(0, close(tf.fd));
53  ASSERT_EQ(0, truncate64(tf.filename, 123));
54
55  struct stat sb;
56  ASSERT_EQ(0, stat(tf.filename, &sb));
57  ASSERT_EQ(123, sb.st_size);
58}
59
60TEST(unistd, ftruncate) {
61  TemporaryFile tf;
62  ASSERT_EQ(0, ftruncate(tf.fd, 123));
63  ASSERT_EQ(0, close(tf.fd));
64
65  struct stat sb;
66  ASSERT_EQ(0, stat(tf.filename, &sb));
67  ASSERT_EQ(123, sb.st_size);
68}
69
70TEST(unistd, ftruncate64) {
71  TemporaryFile tf;
72  ASSERT_EQ(0, ftruncate64(tf.fd, 123));
73  ASSERT_EQ(0, close(tf.fd));
74
75  struct stat sb;
76  ASSERT_EQ(0, stat(tf.filename, &sb));
77  ASSERT_EQ(123, sb.st_size);
78}
79
80static bool gPauseTestFlag = false;
81static void PauseTestSignalHandler(int) {
82  gPauseTestFlag = true;
83}
84
85TEST(unistd, pause) {
86  ScopedSignalHandler handler(SIGALRM, PauseTestSignalHandler);
87
88  alarm(1);
89  ASSERT_FALSE(gPauseTestFlag);
90  ASSERT_EQ(-1, pause());
91  ASSERT_TRUE(gPauseTestFlag);
92}
93
94TEST(unistd, read) {
95  int fd = open("/proc/version", O_RDONLY);
96  ASSERT_TRUE(fd != -1);
97
98  char buf[5];
99  ASSERT_EQ(5, read(fd, buf, 5));
100  ASSERT_EQ(buf[0], 'L');
101  ASSERT_EQ(buf[1], 'i');
102  ASSERT_EQ(buf[2], 'n');
103  ASSERT_EQ(buf[3], 'u');
104  ASSERT_EQ(buf[4], 'x');
105  close(fd);
106}
107
108TEST(unistd, read_EBADF) {
109  // read returns ssize_t which is 64-bits on LP64, so it's worth explicitly checking that
110  // our syscall stubs correctly return a 64-bit -1.
111  char buf[1];
112  ASSERT_EQ(-1, read(-1, buf, sizeof(buf)));
113  ASSERT_EQ(EBADF, errno);
114}
115
116TEST(unistd, alarm) {
117  ASSERT_EQ(0U, alarm(0));
118}
119
120TEST(unistd, _exit) {
121  int pid = fork();
122  ASSERT_NE(-1, pid) << strerror(errno);
123
124  if (pid == 0) {
125    _exit(99);
126  }
127
128  int status;
129  ASSERT_EQ(pid, waitpid(pid, &status, 0));
130  ASSERT_TRUE(WIFEXITED(status));
131  ASSERT_EQ(99, WEXITSTATUS(status));
132}
133