      1
      2
      3
      4
      5
      6
      7
      8
      9
     10
     11
     12
     13
     14
     15
     16
     17
     18
     19
     20
     21
     22
     23
     24
     25
     26
     27
     28
     29
     30
     31
     32
     33
     34
     35
     36
     37
     38
     39
     40
     41
     42
     43
     44
     45
     46
     47
     48
     49
     50
     51
     52
     53
     54
     55
     56
     57
     58
     59
     60
     61
     62
     63
     64
     65
     66
     67
     68
     69
     70
     71
     72
     73
     74
     75
     76
     77
     78
     79
     80
     81
     82
     83
     84
     85
     86
     87
     88
     89
     90
     91
     92
     93
     94
     95
     96
     97
     98
     99
    100
    101
    102
    103
    104
    105
    106
    107
    108
    109
    110
    111
    112
    113
    114
    115
    116
    117
    118
    119
    120
    121
    122
    123
    124
    125
    126
    127
    128
    129
    130
    131
    132
    133
    134
    135
    136
    137
    138
    139
    140
    141
    142
    143
    144
    145
    146
    147
    148
    149
    150
    151
    152
    153
    154
    155
    156
    157
    158
    159
    160
    161
    162
    163
    164
    165
    166
    167
    168
    169
    170
    171
    172
    173
    174
    175
    176
    177
    178
    179
    180
    181
    182
    183
    184
    185
    186
    187
    188
    189
    190
    191
    192
    193
    194
    195
    196
    197
    198
    199
    200
    201
    202
    203
    204
    205
    206
    207
    208
    209
    210
    211
    212
    213
    214
    215
    216
    217
    218
    219
    220
    221
    222
    223
    224
    225
    226
    227
    228
    229
    230
    231
    232
    233
    234
    235
    236
    237
    238
    239
    240
    241
    242
    243
    244
    245
    246
    247
    248
    249
    250
    251
    252

    // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
    // file at the top-level directory of this distribution and at
    // http://rust-lang.org/COPYRIGHT.
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.

    //! Unix-specific extensions to primitives in the `std::fs` module.

    #![stable(feature = "rust1", since = "1.0.0")]

    use fs::{self, Permissions, OpenOptions};
    use io;
    use libc;
    use path::Path;
    use sys;
    use sys_common::{FromInner, AsInner, AsInnerMut};
    use sys::platform::fs::MetadataExt as UnixMetadataExt;

    /// Unix-specific extensions to `Permissions`
    #[stable(feature = "fs_ext", since = "1.1.0")]
    pub trait PermissionsExt {
        /// Returns the underlying raw `mode_t` bits that are the standard Unix
        /// permissions for this file.
        #[stable(feature = "fs_ext", since = "1.1.0")]
        fn mode(&self) -> u32;

        /// Sets the underlying raw bits for this set of permissions.
        #[stable(feature = "fs_ext", since = "1.1.0")]
        fn set_mode(&mut self, mode: u32);

        /// Creates a new instance of `Permissions` from the given set of Unix
        /// permission bits.
        #[stable(feature = "fs_ext", since = "1.1.0")]
        fn from_mode(mode: u32) -> Self;
    }

    #[stable(feature = "fs_ext", since = "1.1.0")]
    impl PermissionsExt for Permissions {
        fn mode(&self) -> u32 {
            self.as_inner().mode()
        }

        fn set_mode(&mut self, mode: u32) {
            *self = Permissions::from_inner(FromInner::from_inner(mode));
        }

        fn from_mode(mode: u32) -> Permissions {
            Permissions::from_inner(FromInner::from_inner(mode))
        }
    }

    /// Unix-specific extensions to `OpenOptions`
    #[stable(feature = "fs_ext", since = "1.1.0")]
    pub trait OpenOptionsExt {
        /// 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.
        #[stable(feature = "fs_ext", since = "1.1.0")]
        fn mode(&mut self, mode: u32) -> &mut Self;

        /// 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
        ///
        /// ```rust,ignore
        /// 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");
        /// ```
        #[stable(feature = "open_options_ext", since = "1.10.0")]
        fn custom_flags(&mut self, flags: i32) -> &mut Self;
    }

    #[stable(feature = "fs_ext", since = "1.1.0")]
    impl OpenOptionsExt for OpenOptions {
        fn mode(&mut self, mode: u32) -> &mut OpenOptions {
            self.as_inner_mut().mode(mode); self
        }

        fn custom_flags(&mut self, flags: i32) -> &mut OpenOptions {
            self.as_inner_mut().custom_flags(flags); self
        }
    }

    // Hm, why are there casts here to the returned type, shouldn't the types always
    // be the same? Right you are! Turns out, however, on android at least the types
    // in the raw `stat` structure are not the same as the types being returned. Who
    // knew!
    //
    // As a result to make sure this compiles for all platforms we do the manual
    // casts and rely on manual lowering to `stat` if the raw type is desired.
    #[stable(feature = "metadata_ext", since = "1.1.0")]
    pub trait MetadataExt {
        #[stable(feature = "metadata_ext", since = "1.1.0")]
        fn dev(&self) -> u64;
        #[stable(feature = "metadata_ext", since = "1.1.0")]
        fn ino(&self) -> u64;
        #[stable(feature = "metadata_ext", since = "1.1.0")]
        fn mode(&self) -> u32;
        #[stable(feature = "metadata_ext", since = "1.1.0")]
        fn nlink(&self) -> u64;
        #[stable(feature = "metadata_ext", since = "1.1.0")]
        fn uid(&self) -> u32;
        #[stable(feature = "metadata_ext", since = "1.1.0")]
        fn gid(&self) -> u32;
        #[stable(feature = "metadata_ext", since = "1.1.0")]
        fn rdev(&self) -> u64;
        #[stable(feature = "metadata_ext", since = "1.1.0")]
        fn size(&self) -> u64;
        #[stable(feature = "metadata_ext", since = "1.1.0")]
        fn atime(&self) -> i64;
        #[stable(feature = "metadata_ext", since = "1.1.0")]
        fn atime_nsec(&self) -> i64;
        #[stable(feature = "metadata_ext", since = "1.1.0")]
        fn mtime(&self) -> i64;
        #[stable(feature = "metadata_ext", since = "1.1.0")]
        fn mtime_nsec(&self) -> i64;
        #[stable(feature = "metadata_ext", since = "1.1.0")]
        fn ctime(&self) -> i64;
        #[stable(feature = "metadata_ext", since = "1.1.0")]
        fn ctime_nsec(&self) -> i64;
        #[stable(feature = "metadata_ext", since = "1.1.0")]
        fn blksize(&self) -> u64;
        #[stable(feature = "metadata_ext", since = "1.1.0")]
        fn blocks(&self) -> u64;
    }

    #[stable(feature = "metadata_ext", since = "1.1.0")]
    impl MetadataExt for fs::Metadata {
        fn dev(&self) -> u64 { self.st_dev() }
        fn ino(&self) -> u64 { self.st_ino() }
        fn mode(&self) -> u32 { self.st_mode() }
        fn nlink(&self) -> u64 { self.st_nlink() }
        fn uid(&self) -> u32 { self.st_uid() }
        fn gid(&self) -> u32 { self.st_gid() }
        fn rdev(&self) -> u64 { self.st_rdev() }
        fn size(&self) -> u64 { self.st_size() }
        fn atime(&self) -> i64 { self.st_atime() }
        fn atime_nsec(&self) -> i64 { self.st_atime_nsec() }
        fn mtime(&self) -> i64 { self.st_mtime() }
        fn mtime_nsec(&self) -> i64 { self.st_mtime_nsec() }
        fn ctime(&self) -> i64 { self.st_ctime() }
        fn ctime_nsec(&self) -> i64 { self.st_ctime_nsec() }
        fn blksize(&self) -> u64 { self.st_blksize() }
        fn blocks(&self) -> u64 { self.st_blocks() }
    }

    /// Add special unix types (block/char device, fifo and socket)
    #[stable(feature = "file_type_ext", since = "1.5.0")]
    pub trait FileTypeExt {
        /// Returns whether this file type is a block device.
        #[stable(feature = "file_type_ext", since = "1.5.0")]
        fn is_block_device(&self) -> bool;
        /// Returns whether this file type is a char device.
        #[stable(feature = "file_type_ext", since = "1.5.0")]
        fn is_char_device(&self) -> bool;
        /// Returns whether this file type is a fifo.
        #[stable(feature = "file_type_ext", since = "1.5.0")]
        fn is_fifo(&self) -> bool;
        /// Returns whether this file type is a socket.
        #[stable(feature = "file_type_ext", since = "1.5.0")]
        fn is_socket(&self) -> bool;
    }

    #[stable(feature = "file_type_ext", since = "1.5.0")]
    impl FileTypeExt for fs::FileType {
        fn is_block_device(&self) -> bool { self.as_inner().is(libc::S_IFBLK) }
        fn is_char_device(&self) -> bool { self.as_inner().is(libc::S_IFCHR) }
        fn is_fifo(&self) -> bool { self.as_inner().is(libc::S_IFIFO) }
        fn is_socket(&self) -> bool { self.as_inner().is(libc::S_IFSOCK) }
    }

    /// Unix-specific extension methods for `fs::DirEntry`
    #[stable(feature = "dir_entry_ext", since = "1.1.0")]
    pub trait DirEntryExt {
        /// Returns the underlying `d_ino` field in the contained `dirent`
        /// structure.
        #[stable(feature = "dir_entry_ext", since = "1.1.0")]
        fn ino(&self) -> u64;
    }

    #[stable(feature = "dir_entry_ext", since = "1.1.0")]
    impl DirEntryExt for fs::DirEntry {
        fn ino(&self) -> u64 { self.as_inner().ino() }
    }

    /// Creates a new symbolic link on the filesystem.
    ///
    /// The `dst` path will be a symbolic link pointing to the `src` path.
    ///
    /// # Note
    ///
    /// On Windows, you must specify whether a symbolic link points to a file
    /// or directory.  Use `os::windows::fs::symlink_file` to create a
    /// symbolic link to a file, or `os::windows::fs::symlink_dir` to create a
    /// symbolic link to a directory.  Additionally, the process must have
    /// `SeCreateSymbolicLinkPrivilege` in order to be able to create a
    /// symbolic link.
    ///
    /// # Examples
    ///
    /// ```
    /// use std::os::unix::fs;
    ///
    /// # fn foo() -> std::io::Result<()> {
    /// try!(fs::symlink("a.txt", "b.txt"));
    /// # Ok(())
    /// # }
    /// ```
    #[stable(feature = "symlink", since = "1.1.0")]
    pub fn symlink<P: AsRef<Path>, Q: AsRef<Path>>(src: P, dst: Q) -> io::Result<()>
    {
        sys::fs::symlink(src.as_ref(), dst.as_ref())
    }

    #[stable(feature = "dir_builder", since = "1.6.0")]
    /// An extension trait for `fs::DirBuilder` for unix-specific options.
    pub trait DirBuilderExt {
        /// Sets the mode to create new directories with. This option defaults to
        /// 0o777.
        #[stable(feature = "dir_builder", since = "1.6.0")]
        fn mode(&mut self, mode: u32) -> &mut Self;
    }

    #[stable(feature = "dir_builder", since = "1.6.0")]
    impl DirBuilderExt for fs::DirBuilder {
        fn mode(&mut self, mode: u32) -> &mut fs::DirBuilder {
            self.as_inner_mut().set_mode(mode);
            self
        }
    }

# Help

## Keyboard Shortcuts

?
  Show this help dialog
S
  Focus the search field
⇤
  Move up in search results
⇥
  Move down in search results
⏎
  Go to active search result
+
  Collapse/expand all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g. `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g. `vec -> usize` or `* -> vec`)