seekable_fd class
An io object, denotes a lseek()-able fd as defined in kernel.
Contents
Stores the offset within, as the kernel offset has race problems and undefined behaviors on error. The offset is auto increased on completion of io operations.
Base classes
- class with_async_context
- able to bound to an async_context
Derived classes
- class mem_fd
- wraps fildes created by memfd_create(2) as an io object
- class normal_file
- wraps fildes that represents an normal file as an io object
Public static variables
- static bool seekable constexpr
Constructors, destructors, conversion operators
- seekable_fd() protected noexcept
- constructs an empty seekable_fd
- seekable_fd(int fd_int) protected noexcept
- constructs an seekable_fd with fildes fd_int and offset set to 0
Public functions
- auto close() -> result<void> noexcept
- call close() on the fd
- auto get() const -> int noexcept
- returns the int fildes
- auto offset() const -> clinux::off_t noexcept
- returns the offset of next io operations
- void seek(clinux::off_t off) noexcept
- sets the offset of next io operations
- void feed(clinux::off_t rel_off) noexcept
- similar to seek(offset() + rel_off)