Function rustix::fs::fcntl_dupfd_cloexec

source · [−]
pub fn fcntl_dupfd_cloexec<Fd: AsFd>(fd: Fd, min: RawFd) -> Result<OwnedFd>
Available on crate feature fs only.
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.

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