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/*
This source file is part of the Swift.org open source project
Copyright (c) 2019 Apple Inc. and the Swift project authors
Licensed under Apache License v2.0 with Runtime Library Exception
See http://swift.org/LICENSE.txt for license information
See http://swift.org/CONTRIBUTORS.txt for Swift project authors
*/
import protocol Foundation.CustomNSError
import var Foundation.NSLocalizedDescriptionKey
import TSCLibc
// FIXME: deprecate 2/2022, remove once clients transitioned
@available(*, deprecated, message: "moved to swift-driver")
public final class DLHandle {
#if os(Windows)
typealias Handle = HMODULE
#else
typealias Handle = UnsafeMutableRawPointer
#endif
var rawValue: Handle? = nil
init(rawValue: Handle) {
self.rawValue = rawValue
}
deinit {
precondition(rawValue == nil, "DLHandle must be closed or explicitly leaked before destroying")
}
public func close() throws {
if let handle = rawValue {
#if os(Windows)
guard FreeLibrary(handle) else {
throw DLError.close("Failed to FreeLibrary: \(GetLastError())")
}
#else
guard dlclose(handle) == 0 else {
throw DLError.close(dlerror() ?? "unknown error")
}
#endif
}
rawValue = nil
}
public func leak() {
rawValue = nil
}
}
// FIXME: deprecate 2/2022, remove once clients transitioned
@available(*, deprecated, message: "moved to swift-driver")
public struct DLOpenFlags: RawRepresentable, OptionSet {
#if !os(Windows)
public static let lazy: DLOpenFlags = DLOpenFlags(rawValue: RTLD_LAZY)
public static let now: DLOpenFlags = DLOpenFlags(rawValue: RTLD_NOW)
public static let local: DLOpenFlags = DLOpenFlags(rawValue: RTLD_LOCAL)
public static let global: DLOpenFlags = DLOpenFlags(rawValue: RTLD_GLOBAL)
// Platform-specific flags.
#if canImport(Darwin)
public static let first: DLOpenFlags = DLOpenFlags(rawValue: RTLD_FIRST)
public static let deepBind: DLOpenFlags = DLOpenFlags(rawValue: 0)
#else
public static let first: DLOpenFlags = DLOpenFlags(rawValue: 0)
#if os(Linux) && canImport(Glibc)
public static let deepBind: DLOpenFlags = DLOpenFlags(rawValue: RTLD_DEEPBIND)
#else
public static let deepBind: DLOpenFlags = DLOpenFlags(rawValue: 0)
#endif
#endif
#endif
public var rawValue: Int32
public init(rawValue: Int32) {
self.rawValue = rawValue
}
}
// FIXME: deprecate 2/2022, remove once clients transitioned
@available(*, deprecated, message: "moved to swift-driver")
public enum DLError: Error {
case `open`(String)
case close(String)
}
@available(*, deprecated, message: "moved to swift-driver")
extension DLError: CustomNSError {
public var errorUserInfo: [String : Any] {
return [NSLocalizedDescriptionKey: "\(self)"]
}
}
// FIXME: deprecate 2/2022, remove once clients transitioned
@available(*, deprecated, message: "moved to swift-driver")
public func dlopen(_ path: String?, mode: DLOpenFlags) throws -> DLHandle {
#if os(Windows)
guard let handle = path?.withCString(encodedAs: UTF16.self, LoadLibraryW) else {
throw DLError.open("LoadLibraryW failed: \(GetLastError())")
}
#else
guard let handle = TSCLibc.dlopen(path, mode.rawValue) else {
throw DLError.open(dlerror() ?? "unknown error")
}
#endif
return DLHandle(rawValue: handle)
}
// FIXME: deprecate 2/2022, remove once clients transitioned
@available(*, deprecated, message: "moved to swift-driver")
public func dlsym<T>(_ handle: DLHandle, symbol: String) -> T? {
#if os(Windows)
guard let ptr = GetProcAddress(handle.rawValue!, symbol) else {
return nil
}
#else
guard let ptr = dlsym(handle.rawValue!, symbol) else {
return nil
}
#endif
return unsafeBitCast(ptr, to: T.self)
}
// FIXME: deprecate 2/2022, remove once clients transitioned
@available(*, deprecated, message: "moved to swift-driver")
public func dlclose(_ handle: DLHandle) throws {
try handle.close()
}
#if !os(Windows)
// FIXME: deprecate 2/2022, remove once clients transitioned
@available(*, deprecated, message: "moved to swift-driver")
public func dlerror() -> String? {
if let err: UnsafeMutablePointer<Int8> = dlerror() {
return String(cString: err)
}
return nil
}
#endif
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