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
|
//! 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-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;
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 [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 {
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(())
}
|
