wehub-resource-sync
133 lines
3.6 KiB
Swift
133 lines
3.6 KiB
Swift
//===----------------------------------------------------------------------===//
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// Copyright © 2026 Apple Inc. and the Containerization project authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//===----------------------------------------------------------------------===//
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#if os(Linux)
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import Foundation
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struct OSFile: Sendable {
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enum IOAction: Equatable {
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case eof
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case again
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case success
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case brokenPipe
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case error(_ errno: Int32)
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}
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private let fd: Int32
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var closed: Bool {
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Foundation.fcntl(fd, F_GETFD) == -1 && errno == EBADF
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}
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var fileDescriptor: Int32 { fd }
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init(fd: Int32) {
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self.fd = fd
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}
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init(handle: FileHandle) {
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self.fd = handle.fileDescriptor
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}
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func close() throws {
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guard Foundation.close(self.fd) == 0 else {
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throw POSIXError(.init(rawValue: errno)!)
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}
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}
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func read(_ buffer: UnsafeMutableBufferPointer<UInt8>) -> (read: Int, action: IOAction) {
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if buffer.count == 0 {
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return (0, .success)
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}
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var bytesRead: Int = 0
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while true {
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let n = Foundation.read(
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self.fd,
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buffer.baseAddress!.advanced(by: bytesRead),
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buffer.count - bytesRead
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)
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if n == -1 {
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if errno == EAGAIN || errno == EIO {
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return (bytesRead, .again)
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}
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return (bytesRead, .error(errno))
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}
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if n == 0 {
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return (bytesRead, .eof)
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}
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bytesRead += n
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if bytesRead < buffer.count {
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continue
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}
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return (bytesRead, .success)
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}
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}
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func write(_ buffer: UnsafeMutableBufferPointer<UInt8>) -> (wrote: Int, action: IOAction) {
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if buffer.count == 0 {
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return (0, .success)
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}
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var bytesWrote: Int = 0
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while true {
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let n = Foundation.write(
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self.fd,
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buffer.baseAddress!.advanced(by: bytesWrote),
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buffer.count - bytesWrote
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)
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if n == -1 {
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if errno == EAGAIN || errno == EIO {
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return (bytesWrote, .again)
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}
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return (bytesWrote, .error(errno))
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}
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if n == 0 {
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return (bytesWrote, .brokenPipe)
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}
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bytesWrote += n
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if bytesWrote < buffer.count {
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continue
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}
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return (bytesWrote, .success)
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}
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}
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static func pipe() -> (read: Self, write: Self) {
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let pipe = Pipe()
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return (Self(handle: pipe.fileHandleForReading), Self(handle: pipe.fileHandleForWriting))
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}
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static func open(path: String) throws -> Self {
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try open(path: path, mode: O_RDONLY | O_CLOEXEC)
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}
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static func open(path: String, mode: Int32) throws -> Self {
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let fd = Foundation.open(path, mode)
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if fd < 0 {
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throw POSIXError(.init(rawValue: errno)!)
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}
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return Self(fd: fd)
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}
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}
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#endif
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