# Trait bitflags::__core::os::ext::prelude::OpenOptionsExt [−] [src]

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

Unix-specific extensions to `OpenOptions`

## Required Methods

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

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.

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

Unstable (`expand_open_options`)

: recently added

Pass custom flags to the `flags` agument 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`

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