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// swiftlint:disable line_length
// REASON: URLs and doc strings
//
// Modified:
// * iOS only
// * removed unused functions
// * reformatted
//
// ISC License
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
// IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
import Foundation
/// A "static"-only namespace around a series of functions that operate on buffers returned from the `Darwin.sysctl` function
struct Sysctl {
/// Possible errors.
enum Error: Swift.Error {
case unknown
case malformedUTF8
case invalidSize
case posixError(POSIXErrorCode)
}
/// Access the raw data for an array of sysctl identifiers.
public static func data(for keys: [Int32]) throws -> [Int8] {
return try keys.withUnsafeBufferPointer { keysPointer throws -> [Int8] in
// Preflight the request to get the required data size
var requiredSize = 0
let preFlightResult = Darwin.sysctl(
UnsafeMutablePointer<Int32>(mutating: keysPointer.baseAddress),
UInt32(keys.count),
nil,
&requiredSize,
nil,
0
)
if preFlightResult != 0 {
throw POSIXErrorCode(rawValue: errno).map {
print($0.rawValue)
return Error.posixError($0)
} ?? Error.unknown
}
// Run the actual request with an appropriately sized array buffer
let data = [Int8](repeating: 0, count: requiredSize)
let result = data.withUnsafeBufferPointer { dataBuffer -> Int32 in
Darwin.sysctl(
UnsafeMutablePointer<Int32>(mutating: keysPointer.baseAddress),
UInt32(keys.count),
UnsafeMutableRawPointer(mutating: dataBuffer.baseAddress),
&requiredSize,
nil,
0
)
}
if result != 0 {
throw POSIXErrorCode(rawValue: errno).map { Error.posixError($0) } ?? Error.unknown
}
return data
}
}
/// Convert a sysctl name string like "hw.memsize" to the array of `sysctl` identifiers (e.g. [CTL_HW, HW_MEMSIZE])
public static func keys(for name: String) throws -> [Int32] {
var keysBufferSize = Int(CTL_MAXNAME)
var keysBuffer = [Int32](repeating: 0, count: keysBufferSize)
try keysBuffer.withUnsafeMutableBufferPointer { (lbp: inout UnsafeMutableBufferPointer<Int32>) throws in
try name.withCString { (nbp: UnsafePointer<Int8>) throws in
guard sysctlnametomib(nbp, lbp.baseAddress, &keysBufferSize) == 0 else {
throw POSIXErrorCode(rawValue: errno).map { Error.posixError($0) } ?? Error.unknown
}
}
}
if keysBuffer.count > keysBufferSize {
keysBuffer.removeSubrange(keysBufferSize ..< keysBuffer.count)
}
return keysBuffer
}
/// Invoke `sysctl` with an array of identifers, interpreting the returned buffer as the specified type.
/// This function will throw `Error.invalidSize` if the size of buffer returned from `sysctl` fails to match the size of `T`.
public static func value<T>(ofType _: T.Type, forKeys keys: [Int32]) throws -> T {
let buffer = try data(for: keys)
if buffer.count != MemoryLayout<T>.size {
throw Error.invalidSize
}
return try buffer.withUnsafeBufferPointer { bufferPtr throws -> T in
guard let baseAddress = bufferPtr.baseAddress else { throw Error.unknown }
return baseAddress.withMemoryRebound(to: T.self, capacity: 1) { $0.pointee }
}
}
/// Invoke `sysctl` with an array of identifers, interpreting the returned buffer as the specified type.
/// This function will throw `Error.invalidSize` if the size of buffer returned from `sysctl` fails to match the size of `T`.
public static func value<T>(ofType type: T.Type, forKeys keys: Int32...) throws -> T {
return try value(ofType: type, forKeys: keys)
}
/// Invoke `sysctl` with the specified name, interpreting the returned buffer as the specified type.
/// This function will throw `Error.invalidSize` if the size of buffer returned from `sysctl` fails to match the size of `T`.
public static func value<T>(ofType type: T.Type, forName name: String) throws -> T {
return try value(ofType: type, forKeys: keys(for: name))
}
/// Invoke `sysctl` with an array of identifers, interpreting the returned buffer as a `String`.
/// This function will throw `Error.malformedUTF8` if the buffer returned from `sysctl` cannot be interpreted as a UTF8 buffer.
public static func string(for keys: [Int32]) throws -> String {
let optionalString = try data(for: keys).withUnsafeBufferPointer { dataPointer -> String? in
dataPointer.baseAddress.flatMap { String(validatingUTF8: $0) }
}
guard let s = optionalString else {
throw Error.malformedUTF8
}
return s
}
/// Invoke `sysctl` with an array of identifers, interpreting the returned buffer as a `String`.
/// This function will throw `Error.malformedUTF8` if the buffer returned from `sysctl` cannot be interpreted as a UTF8 buffer.
public static func string(for keys: Int32...) throws -> String {
return try string(for: keys)
}
/// Invoke `sysctl` with the specified name, interpreting the returned buffer as a `String`.
/// This function will throw `Error.malformedUTF8` if the buffer returned from `sysctl` cannot be interpreted as a UTF8 buffer.
public static func string(for name: String) throws -> String {
return try string(for: keys(for: name))
}
/// Always the same on Apple hardware
public static var manufacturer: String = "Apple"
/// e.g. "N71mAP"
public static var machine: String {
return (try? Sysctl.string(for: [CTL_HW, HW_MODEL])) ?? "Unknown"
}
/// e.g. "iPhone8,1"
public static var model: String {
return (try? Sysctl.string(for: [CTL_HW, HW_MACHINE])) ?? "Unknown"
}
/// e.g. "15D21" or "13D20"
public static var osVersion: String {
return (try? Sysctl.string(for: [CTL_KERN, KERN_OSVERSION])) ?? "Unknown"
}
}
// swiftlint:enable line_length