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//! FFI for statvfs functions
//!
//! See the `vfs::Statvfs` struct for some rusty wrappers
use {Errno, Result, NixPath};
use std::os::unix::io::AsRawFd;
pub mod vfs {
//! Structs related to the `statvfs` and `fstatvfs` functions
//!
//! The `Statvfs` struct has some wrappers methods around the `statvfs` and
//! `fstatvfs` calls.
use libc::{c_ulong,c_int};
use std::os::unix::io::AsRawFd;
use {Result, NixPath};
use super::{statvfs, fstatvfs};
bitflags!(
/// Mount Flags
#[repr(C)]
#[derive(Default)]
pub flags FsFlags: c_ulong {
/// Read Only
const RDONLY = 1,
/// Do not allow the set-uid bits to have an effect
const NOSUID = 2,
/// Do not interpret character or block-special devices
const NODEV = 4,
/// Do not allow execution of binaries on the filesystem
const NOEXEC = 8,
/// All IO should be done synchronously
const SYNCHRONOUS = 16,
/// Allow mandatory locks on the filesystem
const MANDLOCK = 64,
const WRITE = 128,
const APPEND = 256,
const IMMUTABLE = 512,
/// Do not update access times on files
const NOATIME = 1024,
/// Do not update access times on files
const NODIRATIME = 2048,
/// Update access time relative to modify/change time
const RELATIME = 4096,
}
);
/// The posix statvfs struct
///
/// http://linux.die.net/man/2/statvfs
#[repr(C)]
#[derive(Debug,Copy,Clone)]
pub struct Statvfs {
/// Filesystem block size. This is the value that will lead to
/// most efficient use of the filesystem
pub f_bsize: c_ulong,
/// Fragment Size -- actual minimum unit of allocation on this
/// filesystem
pub f_frsize: c_ulong,
/// Total number of blocks on the filesystem
pub f_blocks: u64,
/// Number of unused blocks on the filesystem, including those
/// reserved for root
pub f_bfree: u64,
/// Number of blocks available to non-root users
pub f_bavail: u64,
/// Total number of inodes available on the filesystem
pub f_files: u64,
/// Number of inodes available on the filesystem
pub f_ffree: u64,
/// Number of inodes available to non-root users
pub f_favail: u64,
/// File System ID
pub f_fsid: c_ulong,
/// Mount Flags
pub f_flag: FsFlags,
/// Maximum filename length
pub f_namemax: c_ulong,
/// Reserved extra space, OS-dependent
f_spare: [c_int; 6],
}
impl Statvfs {
/// Create a new `Statvfs` object and fill it with information about
/// the mount that contains `path`
pub fn for_path<P: ?Sized + NixPath>(path: &P) -> Result<Statvfs> {
let mut stat = Statvfs::default();
let res = statvfs(path, &mut stat);
res.map(|_| stat)
}
/// Replace information in this struct with information about `path`
pub fn update_with_path<P: ?Sized + NixPath>(&mut self, path: &P) -> Result<()> {
statvfs(path, self)
}
/// Create a new `Statvfs` object and fill it with information from fd
pub fn for_fd<T: AsRawFd>(fd: &T) -> Result<Statvfs> {
let mut stat = Statvfs::default();
let res = fstatvfs(fd, &mut stat);
res.map(|_| stat)
}
/// Replace information in this struct with information about `fd`
pub fn update_with_fd<T: AsRawFd>(&mut self, fd: &T) -> Result<()> {
fstatvfs(fd, self)
}
}
impl Default for Statvfs {
/// Create a statvfs object initialized to all zeros
fn default() -> Self {
Statvfs {
f_bsize: 0,
f_frsize: 0,
f_blocks: 0,
f_bfree: 0,
f_bavail: 0,
f_files: 0,
f_ffree: 0,
f_favail: 0,
f_fsid: 0,
f_flag: FsFlags::default(),
f_namemax: 0,
f_spare: [0, 0, 0, 0, 0, 0],
}
}
}
}
mod ffi {
use libc::{c_char, c_int};
use sys::statvfs::vfs;
extern {
pub fn statvfs(path: * const c_char, buf: *mut vfs::Statvfs) -> c_int;
pub fn fstatvfs(fd: c_int, buf: *mut vfs::Statvfs) -> c_int;
}
}
/// Fill an existing `Statvfs` object with information about the `path`
pub fn statvfs<P: ?Sized + NixPath>(path: &P, stat: &mut vfs::Statvfs) -> Result<()> {
unsafe {
Errno::clear();
let res = try!(
path.with_nix_path(|path| ffi::statvfs(path.as_ptr(), stat))
);
Errno::result(res).map(drop)
}
}
/// Fill an existing `Statvfs` object with information about `fd`
pub fn fstatvfs<T: AsRawFd>(fd: &T, stat: &mut vfs::Statvfs) -> Result<()> {
unsafe {
Errno::clear();
Errno::result(ffi::fstatvfs(fd.as_raw_fd(), stat)).map(drop)
}
}
#[cfg(test)]
mod test {
use std::fs::File;
use sys::statvfs::*;
#[test]
fn statvfs_call() {
let mut stat = vfs::Statvfs::default();
statvfs("/".as_bytes(), &mut stat).unwrap()
}
#[test]
fn fstatvfs_call() {
let mut stat = vfs::Statvfs::default();
let root = File::open("/").unwrap();
fstatvfs(&root, &mut stat).unwrap()
}
}