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Duplicate the Handle instead of the fd on Windows #2238

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Merged
merged 1 commit into from
May 9, 2019
Merged

Duplicate the Handle instead of the fd on Windows #2238

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10 changes: 10 additions & 0 deletions Foundation/FileHandle.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -111,7 +111,17 @@ open class FileHandle : NSObject {

// Duplicate the file descriptor.
// Closing the file descriptor while Dispatch is monitoring it leads to undefined behavior; guard against that.
#if os(Windows)
var dupHandle: HANDLE?
if !DuplicateHandle(GetCurrentProcess(), handle, GetCurrentProcess(), &dupHandle,
/*dwDesiredAccess:*/0, /*bInheritHandle:*/true, DWORD(DUPLICATE_SAME_ACCESS)) {
fatalError("DuplicateHandleFailed: \(GetLastError())")
}

let fd = _open_osfhandle(intptr_t(bitPattern: dupHandle), 0)
#else
let fd = dup(fileDescriptor)
#endif
let source: DispatchSourceProtocol
if reading {
source = DispatchSource.makeReadSource(fileDescriptor: fd, queue: queue)
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