System.Posix.FD

Provides an alternative for openFd which gives us more control on what status flags to pass to the low-level open(2) call, in contrast to the unix package.

Documentation

openFd

Arguments

:: RawFilePath

-> OpenMode

-> [Flags]

status flags of open(2)

-> Maybe FileMode

Just x => creates the file with the given modes, Nothing => the file must exist.

-> IO Fd

Open and optionally create this file. See Files for information on how to use the FileMode type.

Note that passing Just x as the 4th argument triggers the oCreat status flag, which must be set when you pass in oExcl to the status flags. Also see the manpage for open(2).