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import SystemPackage
extension FdWASIEntry {
/// Returns the metadata for the fd entry
func attributes() throws -> WASIAbi.Filestat {
try WASIAbi.Errno.translatingPlatformErrno {
try WASIAbi.Filestat(stat: self.fd.attributes())
}
}
/// Announces the expected access pattern to the system for optimization
func advise(
offset: WASIAbi.FileSize, length: WASIAbi.FileSize,
advice: WASIAbi.Advice
) throws {
#if os(macOS) || os(iOS) || os(watchOS) || os(tvOS)
guard let offset = Int64(exactly: offset),
let length = Int32(exactly: length)
else {
// no-op if offset or length is invalid
return
}
try WASIAbi.Errno.translatingPlatformErrno {
try self.fd.adviseRead(offset: offset, length: length)
}
#elseif os(Linux)
guard let offset = Int(exactly: offset),
let length = Int(exactly: length)
else {
// no-op if offset or length is invalid
return
}
try WASIAbi.Errno.translatingPlatformErrno {
try self.fd.advise(offset: offset, length: length, advice: .willNeed)
}
#endif
}
/// Closes the file descriptor
func close() throws {
try WASIAbi.Errno.translatingPlatformErrno { try fd.close() }
}
/// Truncates or extends the file
func setFilestatSize(_ size: WASIAbi.FileSize) throws {
try WASIAbi.Errno.translatingPlatformErrno {
try fd.truncate(size: Int64(size))
}
}
/// Seek to the offset
func seek(offset: WASIAbi.FileDelta, whence: WASIAbi.Whence) throws -> WASIAbi.FileSize {
let platformWhence: FileDescriptor.SeekOrigin
switch whence {
case .SET:
platformWhence = .start
case .CUR:
platformWhence = .current
case .END:
platformWhence = .end
}
let newOffset = try WASIAbi.Errno.translatingPlatformErrno {
try fd.seek(offset: offset, from: platformWhence)
}
return WASIAbi.FileSize(newOffset)
}
/// Returns the current reading/writing offset
func tell() throws -> WASIAbi.FileSize {
WASIAbi.FileSize(
try WASIAbi.Errno.translatingPlatformErrno {
try fd.seek(offset: 0, from: .current)
})
}
/// Returns the file type of the file
func fileType() throws -> WASIAbi.FileType {
try WASIAbi.FileType(platformFileType: self.fd.attributes().fileType)
}
/// Returns the current file desciptor status
func status() throws -> WASIAbi.Fdflags {
return try WASIAbi.Errno.translatingPlatformErrno {
WASIAbi.Fdflags(platformOpenOptions: try self.fd.status())
}
}
/// Sets timestamps that belongs to the file
func setTimes(
atim: WASIAbi.Timestamp, mtim: WASIAbi.Timestamp,
fstFlags: WASIAbi.FstFlags
) throws {
let (access, modification) = try WASIAbi.Timestamp.platformTimeSpec(
atim: atim, mtim: mtim, fstFlags: fstFlags
)
try WASIAbi.Errno.translatingPlatformErrno {
try self.fd.setTimes(access: access, modification: modification)
}
}
}
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