Split some larger other tests into separate files. NFC (#25320)

Author: sbc100

test/other/test_readdir_r_silly.cpp

@@ -0,0 +1,102 @@
+#include <cassert>
+#include <iostream>
+#include <cstring>
+#include <cerrno>
+#include <unistd.h>
+#include <fcntl.h>
+#include <cstdlib>
+#include <dirent.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+using std::endl;
+
+// Do a recursive directory listing of the directory whose path is specified
+// by \a name.
+void ls(const std::string& name, size_t indent = 0) {
+  DIR *dir;
+  struct dirent *entry;
+  if (indent == 0) {
+    std::cout << name << endl;
+    ++indent;
+  }
+  // Make sure we can open the directory.  This should also catch cases where
+  // the empty string is passed in.
+  if (not (dir = opendir(name.c_str()))) {
+    const int error = errno;
+    std::cout
+      << "Failed to open directory: " << name << "; " << error << endl;
+    return;
+  }
+  // Just checking the sanity.
+  if (name.empty()) {
+    std::cout
+      << "Managed to open a directory whose name was the empty string.."
+      << endl;
+    assert(closedir(dir) != -1);
+    return;
+  }
+  // Iterate over the entries in the directory.
+  while ((entry = readdir(dir))) {
+    std::string entryName(entry->d_name);
+    if (entryName == "." || entryName == "..") {
+      // Skip the dot entries.
+      continue;
+    }
+    std::string indentStr(indent * 2, ' ');
+    if (entryName.empty()) {
+      std::cout
+        << indentStr << "\"\": Found empty string as a "
+        << (entry->d_type == DT_DIR ? "directory" : "file")
+        << " entry!" << endl;
+      continue;
+    } else {
+      std::cout << indentStr << entryName
+                << (entry->d_type == DT_DIR ? "/" : "") << endl;
+    }
+    if (entry->d_type == DT_DIR) {
+      // We found a subdirectory; recurse.
+      ls(std::string(name + (name == "/" ? "" : "/" ) + entryName),
+         indent + 1);
+    }
+  }
+  // Close our handle.
+  assert(closedir(dir) != -1);
+}
+
+void touch(const char* path) {
+  int fd = open(path, O_CREAT | O_TRUNC, 0644);
+  assert(fd != -1);
+  assert(close(fd) != -1);
+}
+
+int main() {
+  assert(mkdir("dir", 0755) == 0);
+  touch("dir/a");
+  touch("dir/b");
+  touch("dir/c");
+  touch("dir/d");
+  touch("dir/e");
+  std::cout << "Before:" << endl;
+  ls("dir");
+  std::cout << endl;
+  // Attempt to delete entries as we walk the (single) directory.
+  DIR* dir = opendir("dir");
+  assert(dir != NULL);
+  struct dirent *entry;
+  while ((entry = readdir(dir)) != NULL) {
+    std::string name(entry->d_name);
+    // Skip "." and "..".
+    if (name == "." || name == "..") {
+      continue;
+    }
+    // Unlink it.
+    std::cout << "Unlinking " << name << endl;
+    assert(unlink(("dir/" + name).c_str()) != -1);
+  }
+  assert(closedir(dir) != -1);
+  std::cout << "After:" << endl;
+  ls("dir");
+  std::cout << "done" << endl;
+  return 0;
+}

test/other/test_readdir_r_silly.out

@@ -0,0 +1,16 @@
+Before:
+dir
+  a
+  b
+  c
+  d
+  e
+
+Unlinking a
+Unlinking b
+Unlinking c
+Unlinking d
+Unlinking e
+After:
+dir
+done

test/other/test_truncate_from_0.cpp

@@ -0,0 +1,100 @@
+#include <cerrno>
+#include <cstring>
+#include <iostream>
+
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+using std::endl;
+
+//============================================================================
+// :: Helpers
+
+namespace
+{
+  // Returns the size of the regular file specified as 'path'.
+  ::off_t getSize(const char* const path)
+  {
+    // Stat the file and make sure that it's the expected size.
+    struct ::stat path_stat;
+    if (::stat(path, &path_stat) != 0) {
+      const int error = errno;
+      std::cout
+        << "Failed to lstat path: " << path << "; errno=" << error << "; "
+        << std::strerror(error) << endl;
+      return -1;
+    }
+
+    std::cout
+      << "Size of file is: " << path_stat.st_size << endl;
+    return path_stat.st_size;
+  }
+
+  // Causes the regular file specified in 'path' to have a size of 'length'
+  // bytes.
+  void resize(const char* const path,
+              const ::off_t length)
+  {
+    std::cout
+      << "Truncating file=" << path << " to length=" << length << endl;
+    if (::truncate(path, length) == -1)
+    {
+      const int error = errno;
+      std::cout
+        << "Failed to truncate file=" << path << "; errno=" << error
+        << "; " << std::strerror(error) << endl;
+    }
+
+    const ::off_t size = getSize(path);
+    if (size != length) {
+      std::cout
+        << "Failed to truncate file=" << path << " to length=" << length
+        << "; got size=" << size << endl;
+    }
+  }
+
+  // Helper to create a file with the given content.
+  void createFile(const std::string& path, const std::string& content)
+  {
+    std::cout
+      << "Creating file: " << path << " with content=" << content << endl;
+
+    const int fd = ::open(path.c_str(), O_CREAT | O_WRONLY, 0644);
+    if (fd == -1) {
+      const int error = errno;
+      std::cout
+        << "Failed to open file for writing: " << path << "; errno=" << error
+        << "; " << std::strerror(error) << endl;
+      return;
+    }
+
+    if (::write(fd, content.c_str(), content.size()) != content.size()) {
+      const int error = errno;
+      std::cout
+        << "Failed to write content=" << content << " to file=" << path
+        << "; errno=" << error << "; " << std::strerror(error) << endl;
+
+      // Fall through to close FD.
+    }
+
+    ::close(fd);
+  }
+}
+
+//============================================================================
+// :: Entry Point
+int main()
+{
+  const char* const file = "/tmp/file";
+  createFile(file, "This is some content");
+  getSize(file);
+  resize(file, 32);
+  resize(file, 17);
+  resize(file, 0);
+
+  // This throws a JS exception.
+  resize(file, 32);
+  return 0;
+}

test/other/test_truncate_from_0.out

@@ -0,0 +1,10 @@
+Creating file: /tmp/file with content=This is some content
+Size of file is: 20
+Truncating file=/tmp/file to length=32
+Size of file is: 32
+Truncating file=/tmp/file to length=17
+Size of file is: 17
+Truncating file=/tmp/file to length=0
+Size of file is: 0
+Truncating file=/tmp/file to length=32
+Size of file is: 32