[mesos] 02/08: Added a test `FsTest.Lsof`.

[qi...@apache.org]

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qianzhang pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/mesos.git

commit 00497ab19703fb20f71eea74c2df1ff6346391f5
Author: Qian Zhang <zh...@gmail.com>
AuthorDate: Wed Sep 26 16:58:48 2018 +0800

    Added a test `FsTest.Lsof`.
    
    Review: https://reviews.apache.org/r/68991
---
 3rdparty/stout/tests/os/filesystem_tests.cpp | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/3rdparty/stout/tests/os/filesystem_tests.cpp b/3rdparty/stout/tests/os/filesystem_tests.cpp
index 071864b..23b7496 100644
--- a/3rdparty/stout/tests/os/filesystem_tests.cpp
+++ b/3rdparty/stout/tests/os/filesystem_tests.cpp
@@ -657,6 +657,7 @@ TEST_F(FsTest, Xattr)
 }
 #endif // __linux__ || __APPLE__
 
+
 #ifdef __WINDOWS__
 // Check if the overlapped field is set properly on Windows.
 TEST_F(FsTest, Overlapped)
@@ -804,6 +805,7 @@ TEST_F(FsTest, ReadWriteAsyncLargeBuffer)
 }
 #endif // __WINDOWS__
 
+
 #ifndef __WINDOWS__
 TEST_F(FsTest, Used)
 {
@@ -819,4 +821,22 @@ TEST_F(FsTest, Used)
   EXPECT_GT(used.get(), 0u);
   EXPECT_LT(used.get(), size.get());
 }
+
+
+// This test verifies that the file descriptors returned by `os::lsof()`
+// are all open file descriptors and contains stdin, stdout and stderr.
+TEST_F(FsTest, Lsof)
+{
+  Try<std::vector<int_fd>> fds = os::lsof();
+  ASSERT_SOME(fds);
+
+  // Verify each `fd` is an open file descriptor.
+  foreach (int_fd fd, fds.get()) {
+    EXPECT_NE(-1, ::fcntl(fd, F_GETFD));
+  }
+
+  EXPECT_NE(std::find(fds->begin(), fds->end(), 0), fds->end());
+  EXPECT_NE(std::find(fds->begin(), fds->end(), 1), fds->end());
+  EXPECT_NE(std::find(fds->begin(), fds->end(), 2), fds->end());
+}
 #endif // __WINDOWS__