From bc75ca4fe55b0a19852c20e677bb4008156ceaff Mon Sep 17 00:00:00 2001
From: Timothy <timmot@users.noreply.github.com>
Date: Fri, 6 Aug 2021 11:47:55 +1000
Subject: [PATCH] AK: Add method to create MappedFile from fd

---
 AK/MappedFile.cpp | 9 +++++++++
 AK/MappedFile.h   | 1 +
 2 files changed, 10 insertions(+)

diff --git a/AK/MappedFile.cpp b/AK/MappedFile.cpp
index 3957d042a3..6323c1bb93 100644
--- a/AK/MappedFile.cpp
+++ b/AK/MappedFile.cpp
@@ -21,6 +21,15 @@ Result<NonnullRefPtr<MappedFile>, OSError> MappedFile::map(const String& path)
     if (fd < 0)
         return OSError(errno);
 
+    return map_from_fd_and_close(fd, path);
+}
+
+Result<NonnullRefPtr<MappedFile>, OSError> MappedFile::map_from_fd_and_close(int fd, [[maybe_unused]] String const& path)
+{
+    if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1) {
+        return OSError(errno);
+    }
+
     ScopeGuard fd_close_guard = [fd] {
         close(fd);
     };
diff --git a/AK/MappedFile.h b/AK/MappedFile.h
index 23a8eeccd6..9002d8beb1 100644
--- a/AK/MappedFile.h
+++ b/AK/MappedFile.h
@@ -20,6 +20,7 @@ class MappedFile : public RefCounted<MappedFile> {
 
 public:
     static Result<NonnullRefPtr<MappedFile>, OSError> map(const String& path);
+    static Result<NonnullRefPtr<MappedFile>, OSError> map_from_fd_and_close(int fd, String const& path);
     ~MappedFile();
 
     void* data() { return m_data; }