fd: synchronous and asynchronous file descriptors

fd implements an API identical to lua's file object but with support for async operations following the lib/lap protocol.

Mod fd

filedescriptor: direct control of filedescriptors.

async operations support the LAP (see lib/lap) protocol.

Can override default `io` module for global async mode.

Functions

• fn isTrunc(mode) -> bool
  Given a string mode, return whether the file will be truncated.
• fn isCreate(mode)
  Given a string mode, return whether the file will be created if it doesn't exist.
• fn newFD
  Use to explicitly create a sync file-descriptor. Operations will block the current program until complete.
• fn newFDT
  Use to explicitly create a async file-descriptor. Operations will yield if not yet complete.
• fn modifiedEq(fs1, fs2)
  return whether two fstat's have equal modification times FIXME: move this to civix
• fn openWith(openFn, path, mode)
• fn openFD(S.openFD, ...)
• fn openFDT(S.openFDT, ...)
• fn open(...)
• fn close()
• fn tmpfileFn(sysFn)
• fn tmpfile() -> M.tmpfileFn(S.tmpFD)
• fn read(...)
• fn lines(path, mode)
• fn write(...)
• fn openFileno(fileno)
• fn input()
• fn output()
• fn flush()
• fn type(fd)
• fn fileno(fd)
• fn ftype(f)
• fn isatty(fd)
• fn ioStd()
  Switch the global io module to use builtin functions.
• fn ioSync()
  Switch the global io module to use sync functions from this module.
• fn ioAsync()
  Switch the global io module to use async functions from this module.