Function rustix::io::dup2
pub fn dup2<Fd: AsFd>(fd: &Fd, new: &OwnedFd) -> io::Result<()>The portability is definied by:
#[cfg(not(target_os = "wasi"))]Documentation
dup2(fd, new)—Creates a new OwnedFd instance that shares the
same underlying file description as the existing OwnedFd instance,
closing new and reusing its file descriptor.
Note that this function does not set the O_CLOEXEC flag. To do a dup2
that does set O_CLOEXEC, use dup2_with with DupFlags::CLOEXEC on
platforms which support it.