Enum Fd 

pub enum Fd {
    ReadPipe,
    WritePipe,
    Inherit,
    ReadNull,
    WriteNull,
    Fd(Closing),
}

An enumeration that is used to configure non-stdio file descriptors. It differs from stdio one because we must differentiate from readable and writable file descriptors for things open by the library

The enumeration members might be non-stable, it’s better to use one of the constructors to create an instance

Variants

ReadPipe

This fd is a reading end of a pipe

WritePipe

This fd is a writing end of a pipe

Inherit

This fd is inherited from parent (current) process

ReadNull

This fd is redirected from /dev/null

WriteNull

This fd is redirected to /dev/null

Fd(Closing)

This is fd passed by application (and closed by unshare)

Implementations

impl Fd

pub fn piped_read() -> Fd

Create a pipe so that child can read from it

pub fn piped_write() -> Fd

Create a pipe so that child can write to it

pub fn inherit() -> Fd

Inherit the child descriptor from parent

Not very useful for custom file descriptors better use from_file()

pub fn read_null() -> Fd

Create a readable pipe that always has end of file condition

pub fn write_null() -> Fd

Create a writable pipe that ignores all the input

pub fn dup_file<F: AsRawFd>(file: &F) -> Result<Fd>

A simpler helper method for from_raw_fd, that does dup of file descriptor, so is actually safe to use (but can fail)

pub fn from_file<F: IntoRawFd>(file: F) -> Fd

A simpler helper method for from_raw_fd, that consumes file