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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)]
#![deny(warnings)]
#[macro_use]
extern crate bitflags;
extern crate libc;
#[cfg(test)]
extern crate nix_test as nixtest;
// Re-export some libc constants
pub use libc::{c_int, c_void};
#[cfg(unix)]
pub mod errno;
#[cfg(unix)]
pub mod features;
#[cfg(unix)]
pub mod fcntl;
#[cfg(any(target_os = "linux", target_os = "android"))]
pub mod mount;
#[cfg(any(target_os = "linux"))]
pub mod mq;
#[cfg(any(target_os = "linux", target_os = "android"))]
pub mod sched;
#[cfg(unix)]
pub mod sys;
#[cfg(unix)]
pub mod unistd;
/*
*
* ===== Result / Error =====
*
*/
use std::{ptr, result};
use std::path::{Path, PathBuf};
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,
}
}
}
pub trait NixPath {
fn with_nix_path<T, F>(&self, f: F) -> Result<T>
where F: FnOnce(&OsStr) -> T;
}
impl NixPath for [u8] {
fn with_nix_path<T, F>(&self, f: F) -> Result<T>
where F: FnOnce(&OsStr) -> T {
// TODO: Extract this size as a const
let mut buf = [0u8; 4096];
if self.len() >= 4096 {
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(<OsStr as OsStrExt>::from_bytes(&buf[..self.len()])))
}
}
}
}
impl NixPath for Path {
fn with_nix_path<T, F>(&self, f: F) -> Result<T>
where F: FnOnce(&OsStr) -> T {
Ok(f(self.as_os_str()))
}
}
impl NixPath for PathBuf {
fn with_nix_path<T, F>(&self, f: F) -> Result<T>
where F: FnOnce(&OsStr) -> T {
Ok(f(self.as_os_str()))
}
}
#[inline]
pub fn from_ffi(res: libc::c_int) -> Result<()> {
if res != 0 {
return Err(Error::Sys(errno::Errno::last()));
}
Ok(())
}
/*
*
* ===== Impl utilities =====
*
*/
use std::ffi::OsStr;
use std::os::unix::ffi::OsStrExt;
/// Converts a value to an external (FFI) string representation
trait AsExtStr {
fn as_ext_str(&self) -> *const libc::c_char;
}
impl AsExtStr for OsStr {
fn as_ext_str(&self) -> *const libc::c_char {
self.as_bytes().as_ptr() as *const libc::c_char
}
}
|
