Function rustix::io::dup

pub fn dup<Fd: AsFd>(fd: Fd) -> Result<OwnedFd>

dup(fd)—Creates a new OwnedFd instance that shares the same underlying file description as fd.

This function does not set the O_CLOEXEC flag. To do a dup that does set O_CLOEXEC, use fcntl_dupfd_cloexec.

POSIX guarantees that dup will use the lowest unused file descriptor, however it is not safe in general to rely on this, as file descriptors may be unexpectedly allocated on other threads or in libraries.

References

• POSIX
• Linux
• Apple