cyb70289 commented on code in PR #13354:
URL: https://github.com/apache/arrow/pull/13354#discussion_r894088698
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cpp/src/arrow/util/io_util.h:
##########
@@ -124,14 +125,46 @@ Result<bool> DeleteFile(const PlatformFilename&
file_path, bool allow_not_found
ARROW_EXPORT
Result<bool> FileExists(const PlatformFilename& path);
+// TODO expose this more publicly to make it available from io/file.h?
+/// A RAII wrapper for a file descriptor.
Review Comment:
nit nit: `An RAII`?
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cpp/src/arrow/util/io_util_test.cc:
##########
@@ -159,6 +170,282 @@ TEST(WinErrorFromStatus, Basics) {
}
#endif
+class TestFileDescriptor : public ::testing::Test {
+ public:
+ Result<int> NewFileDescriptor() {
+ // Make a new fd by dup'ing C stdout (why not?)
+ int new_fd = dup(1);
+ if (new_fd < 0) {
+ return IOErrorFromErrno(errno, "Failed to dup() C stdout");
+ }
+ return new_fd;
+ }
+
+ void AssertValidFileDescriptor(int fd) {
+ ASSERT_FALSE(FileIsClosed(fd)) << "Not a valid file descriptor: " << fd;
+ }
+
+ void AssertInvalidFileDescriptor(int fd) {
+ ASSERT_TRUE(FileIsClosed(fd)) << "Unexpectedly valid file descriptor: " <<
fd;
+ }
+};
+
+TEST_F(TestFileDescriptor, Basics) {
+ int new_fd, new_fd2;
+
+ // Default initialization
+ FileDescriptor a;
+ ASSERT_EQ(a.fd(), -1);
+ ASSERT_TRUE(a.closed());
+ ASSERT_OK(a.Close());
+ ASSERT_OK(a.Close());
+
+ // Assignment
+ ASSERT_OK_AND_ASSIGN(new_fd, NewFileDescriptor());
+ AssertValidFileDescriptor(new_fd);
+ a = FileDescriptor(new_fd);
+ ASSERT_FALSE(a.closed());
+ ASSERT_GT(a.fd(), 2);
Review Comment:
Will it fail if `stdin` or `stderr` is closed? Though I don't think it will
happen.
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