pub fn fcntl_dupfd_cloexec<Fd: AsFd>(fd: Fd, min: RawFd) -> Result<OwnedFd>Expand description
fcntl(fd, F_DUPFD_CLOEXEC)—Creates a new OwnedFd instance, with value
at least min, that has O_CLOEXEC set and that shares the same
underlying [file description] as fd.
POSIX guarantees that F_DUPFD_CLOEXEC will use the lowest unused file
descriptor which is at least min, however it is not safe in general to
rely on this, as file descriptors may be unexpectedly allocated on other
threads or in libraries.