Provides bytestring file-descriptor based i/o api, designed loosely after the string file-descriptor based i/o api in system.posix.io. the functions here wrap standard c implementations of the functions specified by the iso/iec 9945-1:1990 (`posix.1') and x/open portability guide issue 4, version 2 (`xpg4.2') specifications. this package provides a library for the haskell programming language, compiled for profiling. see http://www.haskell.org/ for more information on haskell.