T. R. Bernstein
134034f3ea
Automatic subtree watching only reacted to `CREATE`, so a directory moved in from elsewhere stayed unwatched. It is now handled like a created one. Items that already exist in such a directory never produce kernel events; they are reported with the same event kind and `synthesized` set to `true`, so consumers can treat them as newly appeared.
59 lines
1.6 KiB
Swift
59 lines
1.6 KiB
Swift
import CInotify
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struct InotifyEventParser {
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static let readBufferSize = 4096
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static func parse(fromFileDescriptor fd: Int32) -> [RawInotifyEvent] {
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let buffer = UnsafeMutableRawPointer.allocate(
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byteCount: Self.readBufferSize,
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alignment: MemoryLayout<inotify_event>.alignment
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)
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defer { buffer.deallocate() }
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let bytesRead = read(fd, buffer, readBufferSize)
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guard bytesRead > 0 else { return [] }
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return Self.parseEventBuffer(buffer, bytesRead: bytesRead)
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}
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private static func parseEventBuffer(
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_ buffer: UnsafeMutableRawPointer,
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bytesRead: Int
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) -> [RawInotifyEvent] {
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var events: [RawInotifyEvent] = []
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var offset = 0
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while offset < bytesRead {
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let eventPointer = buffer.advanced(by: offset)
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let rawEvent = eventPointer.assumingMemoryBound(to: inotify_event.self).pointee
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events.append(RawInotifyEvent(
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watchDescriptor: rawEvent.wd,
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mask: InotifyEventMask(rawValue: rawEvent.mask),
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cookie: rawEvent.cookie,
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name: Self.extractName(from: eventPointer, nameLength: rawEvent.len),
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synthesized: false
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))
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offset += Self.eventSize(nameLength: rawEvent.len)
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}
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return events
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}
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private static func extractName(
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from eventPointer: UnsafeMutableRawPointer,
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nameLength: UInt32
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) -> String {
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guard nameLength > 0 else { return "" }
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let namePointer = eventPointer
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.advanced(by: MemoryLayout<inotify_event>.size)
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.assumingMemoryBound(to: CChar.self)
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return String(cString: namePointer)
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}
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private static func eventSize(nameLength: UInt32) -> Int {
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MemoryLayout<inotify_event>.size + Int(nameLength)
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}
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}
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