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|
//! Rust friendly bindings to the various *nix system functions.
//!
//! Modules are structured according to the C header file that they would be
//! defined in.
#![crate_name = "nix"]
#![cfg(unix)]
#![allow(non_camel_case_types)]
// latest bitflags triggers a rustc bug with cross-crate macro expansions causing dead_code
// warnings even though the macro expands into something with allow(dead_code)
#![allow(dead_code)]
#![deny(warnings)]
#[macro_use]
extern crate bitflags;
extern crate libc;
#[cfg(test)]
extern crate nix_test as nixtest;
// Re-exports
pub use libc::{c_int, c_void};
pub use errno::Errno;
pub mod errno;
pub mod features;
pub mod fcntl;
#[cfg(any(target_os = "linux", target_os = "android"))]
pub mod mount;
#[cfg(any(target_os = "linux"))]
pub mod mqueue;
#[cfg(any(target_os = "linux", target_os = "macos"))]
pub mod poll;
pub mod net;
#[cfg(any(target_os = "linux", target_os = "android"))]
pub mod sched;
pub mod sys;
pub mod unistd;
/*
*
* ===== Result / Error =====
*
*/
use libc::c_char;
use std::{ptr, result};
use std::ffi::{CStr, OsStr};
use std::path::{Path, PathBuf};
use std::os::unix::ffi::OsStrExt;
use std::io;
use std::fmt;
use std::error;
use libc::PATH_MAX;
pub type Result<T> = result::Result<T, Error>;
#[derive(Clone, Copy, Debug, PartialEq)]
pub enum Error {
Sys(errno::Errno),
InvalidPath,
}
impl Error {
pub fn from_errno(errno: errno::Errno) -> Error {
Error::Sys(errno)
}
pub fn last() -> Error {
Error::Sys(errno::Errno::last())
}
pub fn invalid_argument() -> Error {
Error::Sys(errno::EINVAL)
}
pub fn errno(&self) -> errno::Errno {
match *self {
Error::Sys(errno) => errno,
Error::InvalidPath => errno::Errno::EINVAL,
}
}
}
impl From<errno::Errno> for Error {
fn from(errno: errno::Errno) -> Error { Error::from_errno(errno) }
}
impl error::Error for Error {
fn description(&self) -> &str {
match self {
&Error::InvalidPath => "Invalid path",
&Error::Sys(ref errno) => errno.desc(),
}
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
&Error::InvalidPath => write!(f, "Invalid path"),
&Error::Sys(errno) => write!(f, "{:?}: {}", errno, errno.desc()),
}
}
}
impl From<Error> for io::Error {
fn from(err: Error) -> Self {
match err {
Error::InvalidPath => io::Error::new(io::ErrorKind::InvalidInput, err),
Error::Sys(errno) => io::Error::from_raw_os_error(errno as i32),
}
}
}
pub trait NixPath {
fn len(&self) -> usize;
fn with_nix_path<T, F>(&self, f: F) -> Result<T>
where F: FnOnce(&CStr) -> T;
}
impl NixPath for str {
fn len(&self) -> usize {
NixPath::len(OsStr::new(self))
}
fn with_nix_path<T, F>(&self, f: F) -> Result<T>
where F: FnOnce(&CStr) -> T {
OsStr::new(self).with_nix_path(f)
}
}
impl NixPath for OsStr {
fn len(&self) -> usize {
self.as_bytes().len()
}
fn with_nix_path<T, F>(&self, f: F) -> Result<T>
where F: FnOnce(&CStr) -> T {
self.as_bytes().with_nix_path(f)
}
}
impl NixPath for CStr {
fn len(&self) -> usize {
self.to_bytes().len()
}
fn with_nix_path<T, F>(&self, f: F) -> Result<T>
where F: FnOnce(&CStr) -> T {
// Equivalence with the [u8] impl.
if self.len() >= PATH_MAX as usize {
return Err(Error::InvalidPath);
}
Ok(f(self))
}
}
impl NixPath for [u8] {
fn len(&self) -> usize {
self.len()
}
fn with_nix_path<T, F>(&self, f: F) -> Result<T>
where F: FnOnce(&CStr) -> T {
let mut buf = [0u8; PATH_MAX as usize];
if self.len() >= PATH_MAX as usize {
return Err(Error::InvalidPath);
}
match self.iter().position(|b| *b == 0) {
Some(_) => Err(Error::InvalidPath),
None => {
unsafe {
// TODO: Replace with bytes::copy_memory. rust-lang/rust#24028
ptr::copy_nonoverlapping(self.as_ptr(), buf.as_mut_ptr(), self.len());
Ok(f(CStr::from_ptr(buf.as_ptr() as *const c_char)))
}
}
}
}
}
impl NixPath for Path {
fn len(&self) -> usize {
NixPath::len(self.as_os_str())
}
fn with_nix_path<T, F>(&self, f: F) -> Result<T> where F: FnOnce(&CStr) -> T {
self.as_os_str().with_nix_path(f)
}
}
impl NixPath for PathBuf {
fn len(&self) -> usize {
NixPath::len(self.as_os_str())
}
fn with_nix_path<T, F>(&self, f: F) -> Result<T> where F: FnOnce(&CStr) -> T {
self.as_os_str().with_nix_path(f)
}
}
/// Treats `None` as an empty string.
impl<'a, NP: ?Sized + NixPath> NixPath for Option<&'a NP> {
fn len(&self) -> usize {
self.map_or(0, NixPath::len)
}
fn with_nix_path<T, F>(&self, f: F) -> Result<T> where F: FnOnce(&CStr) -> T {
if let Some(nix_path) = *self {
nix_path.with_nix_path(f)
} else {
unsafe { CStr::from_ptr("\0".as_ptr() as *const _).with_nix_path(f) }
}
}
}
|
