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
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! Simple file-locking apis for each OS.
//!
//! This is not meant to be in the standard library, it does nothing with
//! green/native threading. This is just a bare-bones enough solution for
//! librustdoc, it is not production quality at all.
#![allow(non_camel_case_types)]
pub use self::imp::Lock;
#[cfg(unix)]
mod imp {
use libc;
#[cfg(target_os = "linux")]
mod os {
use libc;
pub struct flock {
pub l_type: libc::c_short,
pub l_whence: libc::c_short,
pub l_start: libc::off_t,
pub l_len: libc::off_t,
pub l_pid: libc::pid_t,
// not actually here, but brings in line with freebsd
pub l_sysid: libc::c_int,
}
pub static F_WRLCK: libc::c_short = 1;
pub static F_UNLCK: libc::c_short = 2;
pub static F_SETLK: libc::c_int = 6;
pub static F_SETLKW: libc::c_int = 7;
}
#[cfg(target_os = "freebsd")]
mod os {
use libc;
pub struct flock {
pub l_start: libc::off_t,
pub l_len: libc::off_t,
pub l_pid: libc::pid_t,
pub l_type: libc::c_short,
pub l_whence: libc::c_short,
pub l_sysid: libc::c_int,
}
pub static F_UNLCK: libc::c_short = 2;
pub static F_WRLCK: libc::c_short = 3;
pub static F_SETLK: libc::c_int = 12;
pub static F_SETLKW: libc::c_int = 13;
}
#[cfg(target_os = "macos")]
mod os {
use libc;
pub struct flock {
pub l_start: libc::off_t,
pub l_len: libc::off_t,
pub l_pid: libc::pid_t,
pub l_type: libc::c_short,
pub l_whence: libc::c_short,
// not actually here, but brings in line with freebsd
pub l_sysid: libc::c_int,
}
pub static F_UNLCK: libc::c_short = 2;
pub static F_WRLCK: libc::c_short = 3;
pub static F_SETLK: libc::c_int = 8;
pub static F_SETLKW: libc::c_int = 9;
}
pub struct Lock {
fd: libc::c_int,
}
impl Lock {
pub fn new(p: &Path) -> Lock {
let fd = p.with_c_str(|s| unsafe {
libc::open(s, libc::O_RDWR | libc::O_CREAT, libc::S_IRWXU)
});
assert!(fd > 0);
let flock = os::flock {
l_start: 0,
l_len: 0,
l_pid: 0,
l_whence: libc::SEEK_SET as libc::c_short,
l_type: os::F_WRLCK,
l_sysid: 0,
};
let ret = unsafe {
libc::fcntl(fd, os::F_SETLKW, &flock as *os::flock)
};
if ret == -1 {
unsafe { libc::close(fd); }
fail!("could not lock `{}`", p.display())
}
Lock { fd: fd }
}
}
impl Drop for Lock {
fn drop(&mut self) {
let flock = os::flock {
l_start: 0,
l_len: 0,
l_pid: 0,
l_whence: libc::SEEK_SET as libc::c_short,
l_type: os::F_UNLCK,
l_sysid: 0,
};
unsafe {
libc::fcntl(self.fd, os::F_SETLK, &flock as *os::flock);
libc::close(self.fd);
}
}
}
}
#[cfg(windows)]
mod imp {
use libc;
use std::mem;
use std::os::win32::as_utf16_p;
use std::os;
use std::ptr;
static LOCKFILE_EXCLUSIVE_LOCK: libc::DWORD = 0x00000002;
extern "system" {
fn LockFileEx(hFile: libc::HANDLE,
dwFlags: libc::DWORD,
dwReserved: libc::DWORD,
nNumberOfBytesToLockLow: libc::DWORD,
nNumberOfBytesToLockHigh: libc::DWORD,
lpOverlapped: libc::LPOVERLAPPED) -> libc::BOOL;
fn UnlockFileEx(hFile: libc::HANDLE,
dwReserved: libc::DWORD,
nNumberOfBytesToLockLow: libc::DWORD,
nNumberOfBytesToLockHigh: libc::DWORD,
lpOverlapped: libc::LPOVERLAPPED) -> libc::BOOL;
}
pub struct Lock {
handle: libc::HANDLE,
}
impl Lock {
pub fn new(p: &Path) -> Lock {
let handle = as_utf16_p(p.as_str().unwrap(), |p| unsafe {
libc::CreateFileW(p,
libc::FILE_GENERIC_READ |
libc::FILE_GENERIC_WRITE,
libc::FILE_SHARE_READ |
libc::FILE_SHARE_DELETE |
libc::FILE_SHARE_WRITE,
ptr::mut_null(),
libc::CREATE_ALWAYS,
libc::FILE_ATTRIBUTE_NORMAL,
ptr::mut_null())
});
if handle as uint == libc::INVALID_HANDLE_VALUE as uint {
fail!("create file error: {}", os::last_os_error());
}
let mut overlapped: libc::OVERLAPPED = unsafe { mem::zeroed() };
let ret = unsafe {
LockFileEx(handle, LOCKFILE_EXCLUSIVE_LOCK, 0, 100, 0,
&mut overlapped)
};
if ret == 0 {
unsafe { libc::CloseHandle(handle); }
fail!("could not lock `{}`: {}", p.display(),
os::last_os_error())
}
Lock { handle: handle }
}
}
impl Drop for Lock {
fn drop(&mut self) {
let mut overlapped: libc::OVERLAPPED = unsafe { mem::zeroed() };
unsafe {
UnlockFileEx(self.handle, 0, 100, 0, &mut overlapped);
libc::CloseHandle(self.handle);
}
}
}
}
|
