LibCore: Implement LocalSocket::release_fd

release_fd() releases the fd associated with the LocalSocket it is
called on. This is analogous to release_value() on container objects in
AK, after which the object does not contain the value.

2 files changed, 17 insertions, 0 deletions

diff --git a/Userland/Libraries/LibCore/Stream.cpp b/Userland/Libraries/LibCore/Stream.cpp
index e8f26757b2..5a8ba56e05 100644
--- a/Userland/Libraries/LibCore/Stream.cpp
+++ b/Userland/Libraries/LibCore/Stream.cpp
@@ -535,4 +535,15 @@ ErrorOr<size_t> LocalSocket::read_without_waiting(Bytes buffer)
     return m_helper.read(buffer, MSG_DONTWAIT);
 }
 
+ErrorOr<int> LocalSocket::release_fd()
+{
+    if (!is_open()) {
+        return Error::from_errno(ENOTCONN);
+    }
+
+    auto fd = m_helper.fd();
+    m_helper.set_fd(-1);
+    return fd;
+}
+
 }
diff --git a/Userland/Libraries/LibCore/Stream.h b/Userland/Libraries/LibCore/Stream.h
index 9bfe2c4b81..3af5633653 100644
--- a/Userland/Libraries/LibCore/Stream.h
+++ b/Userland/Libraries/LibCore/Stream.h
@@ -416,6 +416,12 @@ public:
     ErrorOr<pid_t> peer_pid() const;
     ErrorOr<size_t> read_without_waiting(Bytes buffer);
 
+    /// Release the fd associated with this LocalSocket. After the fd is
+    /// released, the socket will be considered "closed" and all operations done
+    /// on it will fail with ENOTCONN. Fails with ENOTCONN if the socket is
+    /// already closed.
+    ErrorOr<int> release_fd();
+
     virtual ~LocalSocket() { close(); }
 
 private: