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
//! 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};

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 = "android"))]
pub mod sched;

pub mod sys;
pub mod unistd;

/*
 *
 * ===== Result / Error =====
 *
 */

use libc::c_char;
use std::{ptr, result};
use std::ffi::CStr;
use std::path::{Path, PathBuf};
use std::os::unix::ffi::OsStrExt;

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 len(&self) -> usize;

    fn with_nix_path<T, F>(&self, f: F) -> Result<T>
        where F: FnOnce(&CStr) -> T;
}

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 {
        // 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(CStr::from_ptr(buf.as_ptr() as *const c_char)))
                }

            }
        }
    }
}

impl NixPath for Path {
    fn len(&self) -> usize {
        self.as_os_str().as_bytes().len()
    }

    fn with_nix_path<T, F>(&self, f: F) -> Result<T> where F: FnOnce(&CStr) -> T {
        self.as_os_str().as_bytes().with_nix_path(f)
    }
}

impl NixPath for PathBuf {
    fn len(&self) -> usize {
        self.as_os_str().as_bytes().len()
    }

    fn with_nix_path<T, F>(&self, f: F) -> Result<T> where F: FnOnce(&CStr) -> T {
        self.as_os_str().as_bytes().with_nix_path(f)
    }
}

#[inline]
pub fn from_ffi(res: libc::c_int) -> Result<()> {
    if res != 0 {
        return Err(Error::Sys(errno::Errno::last()));
    }

    Ok(())
}