Clean up the implementation of the <dirent.h> functions.
Change-Id: I3c647cc9588525afc41fee90ee468d58cd13503a
diff --git a/tests/dirent_test.cpp b/tests/dirent_test.cpp
new file mode 100644
index 0000000..4e364d3
--- /dev/null
+++ b/tests/dirent_test.cpp
@@ -0,0 +1,191 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <gtest/gtest.h>
+
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <algorithm>
+#include <set>
+#include <string>
+
+#ifdef __BIONIC__
+static int my_alphasort(const dirent** lhs, const dirent** rhs) {
+ return alphasort(lhs, rhs);
+}
+#endif
+
+static void CheckProcSelf(std::set<std::string>& names) {
+ // We have a good idea of what should be in /proc/self.
+ ASSERT_TRUE(names.find(".") != names.end());
+ ASSERT_TRUE(names.find("..") != names.end());
+ ASSERT_TRUE(names.find("cmdline") != names.end());
+ ASSERT_TRUE(names.find("fd") != names.end());
+ ASSERT_TRUE(names.find("stat") != names.end());
+}
+
+TEST(dirent, scandir) {
+ // Get everything from /proc/self...
+ dirent** entries;
+#ifdef __BIONIC__
+ int entry_count = scandir("/proc/self", &entries, NULL, my_alphasort);
+#else
+ int entry_count = scandir("/proc/self", &entries, NULL, alphasort);
+#endif
+ ASSERT_GE(entry_count, 0);
+
+ // Turn the directory entries into a set and vector of the names.
+ std::set<std::string> name_set;
+ std::vector<std::string> unsorted_name_list;
+ for (size_t i = 0; i < static_cast<size_t>(entry_count); ++i) {
+ name_set.insert(entries[i]->d_name);
+ unsorted_name_list.push_back(entries[i]->d_name);
+ free(entries[i]);
+ }
+ free(entries);
+
+ // No duplicates.
+ ASSERT_EQ(name_set.size(), unsorted_name_list.size());
+
+ // All entries sorted.
+ std::vector<std::string> sorted_name_list(unsorted_name_list);
+ std::sort(sorted_name_list.begin(), sorted_name_list.end());
+ ASSERT_EQ(sorted_name_list, unsorted_name_list);
+
+ CheckProcSelf(name_set);
+}
+
+TEST(dirent, fdopendir_invalid) {
+ ASSERT_TRUE(fdopendir(-1) == NULL);
+ ASSERT_EQ(errno, EBADF);
+
+ int fd = open("/dev/null", O_RDONLY);
+ ASSERT_NE(fd, -1);
+ ASSERT_TRUE(fdopendir(fd) == NULL);
+ ASSERT_EQ(errno, ENOTDIR);
+ close(fd);
+}
+
+TEST(dirent, fdopendir) {
+ int fd = open("/proc/self", O_RDONLY);
+ DIR* d = fdopendir(fd);
+ ASSERT_TRUE(d != NULL);
+ dirent* e = readdir(d);
+ ASSERT_STREQ(e->d_name, ".");
+ ASSERT_EQ(closedir(d), 0);
+
+ // fdopendir(3) took ownership, so closedir(3) closed our fd.
+ ASSERT_EQ(close(fd), -1);
+ ASSERT_EQ(errno, EBADF);
+}
+
+TEST(dirent, opendir_invalid) {
+ ASSERT_TRUE(opendir("/does/not/exist") == NULL);
+ ASSERT_EQ(errno, ENOENT);
+
+ ASSERT_TRUE(opendir("/dev/null") == NULL);
+ ASSERT_EQ(errno, ENOTDIR);
+}
+
+TEST(dirent, opendir) {
+ DIR* d = opendir("/proc/self");
+ ASSERT_TRUE(d != NULL);
+ dirent* e = readdir(d);
+ ASSERT_STREQ(e->d_name, ".");
+ ASSERT_EQ(closedir(d), 0);
+}
+
+TEST(dirent, closedir_invalid) {
+ DIR* d = NULL;
+ ASSERT_EQ(closedir(d), -1);
+ ASSERT_EQ(errno, EINVAL);
+}
+
+TEST(dirent, closedir) {
+ DIR* d = opendir("/proc/self");
+ ASSERT_TRUE(d != NULL);
+ ASSERT_EQ(closedir(d), 0);
+}
+
+TEST(dirent, readdir) {
+ DIR* d = opendir("/proc/self");
+ ASSERT_TRUE(d != NULL);
+ std::set<std::string> name_set;
+ errno = 0;
+ dirent* e;
+ while ((e = readdir(d)) != NULL) {
+ name_set.insert(e->d_name);
+ }
+ // Reading to the end of the directory is not an error.
+ // readdir(3) returns NULL, but leaves errno as 0.
+ ASSERT_EQ(errno, 0);
+ ASSERT_EQ(closedir(d), 0);
+
+ CheckProcSelf(name_set);
+}
+
+TEST(dirent, readdir_r) {
+ DIR* d = opendir("/proc/self");
+ ASSERT_TRUE(d != NULL);
+ std::set<std::string> name_set;
+ errno = 0;
+ dirent storage;
+ dirent* e = NULL;
+ while (readdir_r(d, &storage, &e) == 0 && e != NULL) {
+ name_set.insert(e->d_name);
+ }
+ // Reading to the end of the directory is not an error.
+ // readdir_r(3) returns NULL, but leaves errno as 0.
+ ASSERT_EQ(errno, 0);
+ ASSERT_EQ(closedir(d), 0);
+
+ CheckProcSelf(name_set);
+}
+
+TEST(dirent, rewinddir) {
+ DIR* d = opendir("/proc/self");
+ ASSERT_TRUE(d != NULL);
+
+ // Get all the names once...
+ std::vector<std::string> pass1;
+ dirent* e;
+ while ((e = readdir(d)) != NULL) {
+ pass1.push_back(e->d_name);
+ }
+
+ // ...rewind...
+ rewinddir(d);
+
+ // ...and get all the names again.
+ std::vector<std::string> pass2;
+ while ((e = readdir(d)) != NULL) {
+ pass2.push_back(e->d_name);
+ }
+
+ ASSERT_EQ(closedir(d), 0);
+
+ // We should have seen the same names in the same order both times.
+ ASSERT_EQ(pass1.size(), pass2.size());
+ for (size_t i = 0; i < pass1.size(); ++i) {
+ ASSERT_EQ(pass1[i], pass2[i]);
+ }
+}