Trait std::os::unix::fs::OpenOptionsExt

pub trait OpenOptionsExt {
    fn mode(&mut self, mode: u32) -> &mut Self;
    fn custom_flags(&mut self, flags: i32) -> &mut Self;
}

This is supported on Unix only.

Unix-specific extensions to OpenOptions

Required Methods

Important traits for &'a mut I

impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;impl<'a, R: Read + ?Sized> Read for &'a mut Rimpl<'a, W: Write + ?Sized> Write for &'a mut W

fn mode(&mut self, mode: u32) -> &mut Self

This is supported on Unix only.

Sets the mode bits that a new file will be created with.

If a new file is created as part of a File::open_opts call then this specified mode will be used as the permission bits for the new file. If no mode is set, the default of 0o666 will be used. The operating system masks out bits with the systems umask, to produce the final permissions.

Examples

use std::fs::OpenOptions;
use std::os::unix::fs::OpenOptionsExt;

let mut options = OpenOptions::new();
options.mode(0o644); // Give read/write for owner and read for others.
let file = options.open("foo.txt");

Important traits for &'a mut I

impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;impl<'a, R: Read + ?Sized> Read for &'a mut Rimpl<'a, W: Write + ?Sized> Write for &'a mut W

fn custom_flags(&mut self, flags: i32) -> &mut Self

This is supported on Unix only.

Pass custom flags to the flags argument of open.

The bits that define the access mode are masked out with O_ACCMODE, to ensure they do not interfere with the access mode set by Rusts options.

Custom flags can only set flags, not remove flags set by Rusts options. This options overwrites any previously set custom flags.

Examples

extern crate libc;
use std::fs::OpenOptions;
use std::os::unix::fs::OpenOptionsExt;

let mut options = OpenOptions::new();
options.write(true);
if cfg!(unix) {
    options.custom_flags(libc::O_NOFOLLOW);
}
let file = options.open("foo.txt");

Implementors

• impl OpenOptionsExt for OpenOptions