Instance MethodSystemPackage
read(fromAbsoluteOffset:into:retryOnInterrupt:)
Reads bytes at the specified offset into a buffer.
func read(fromAbsoluteOffset offset: Int64, into buffer: UnsafeMutableRawBufferPointer, retryOnInterrupt: Bool = true) throws -> IntParameters
- offset
The file offset where reading begins.
- buffer
The region of memory to read into.
- retryOnInterrupt
Whether to retry the read operation if it throws
Errno.interrupted. The default istrue. Passfalseto try only once and throw an error upon interruption.
Returns
The number of bytes that were read.
Overview
The doc://com.apple.documentation/documentation/swift/unsafemutablerawbufferpointer/3019191-count property of buffer determines the maximum number of bytes that are read into that buffer.
Unlike read(into:retryOnInterrupt:), this method leaves the file’s existing offset unchanged.
The corresponding C function is pread.