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85aaf69f | 1 | // Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT |
1a4d82fc JJ |
2 | // file at the top-level directory of this distribution and at |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
5 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
6 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
7 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | |
8 | // option. This file may not be copied, modified, or distributed | |
9 | // except according to those terms. | |
10 | ||
11 | //! Simple file-locking apis for each OS. | |
12 | //! | |
13 | //! This is not meant to be in the standard library, it does nothing with | |
14 | //! green/native threading. This is just a bare-bones enough solution for | |
15 | //! librustdoc, it is not production quality at all. | |
16 | ||
17 | #![allow(non_camel_case_types)] | |
18 | ||
19 | pub use self::imp::Lock; | |
20 | ||
21 | #[cfg(unix)] | |
22 | mod imp { | |
c34b1796 AL |
23 | use std::ffi::{CString, OsStr}; |
24 | use std::os::unix::prelude::*; | |
25 | use std::path::Path; | |
26 | use std::io; | |
1a4d82fc JJ |
27 | use libc; |
28 | ||
29 | #[cfg(target_os = "linux")] | |
30 | mod os { | |
31 | use libc; | |
32 | ||
33 | pub struct flock { | |
34 | pub l_type: libc::c_short, | |
35 | pub l_whence: libc::c_short, | |
36 | pub l_start: libc::off_t, | |
37 | pub l_len: libc::off_t, | |
38 | pub l_pid: libc::pid_t, | |
39 | ||
40 | // not actually here, but brings in line with freebsd | |
41 | pub l_sysid: libc::c_int, | |
42 | } | |
43 | ||
44 | pub const F_WRLCK: libc::c_short = 1; | |
45 | pub const F_UNLCK: libc::c_short = 2; | |
46 | pub const F_SETLK: libc::c_int = 6; | |
47 | pub const F_SETLKW: libc::c_int = 7; | |
48 | } | |
49 | ||
50 | #[cfg(target_os = "freebsd")] | |
51 | mod os { | |
52 | use libc; | |
53 | ||
54 | pub struct flock { | |
55 | pub l_start: libc::off_t, | |
56 | pub l_len: libc::off_t, | |
57 | pub l_pid: libc::pid_t, | |
58 | pub l_type: libc::c_short, | |
59 | pub l_whence: libc::c_short, | |
60 | pub l_sysid: libc::c_int, | |
61 | } | |
62 | ||
63 | pub const F_UNLCK: libc::c_short = 2; | |
64 | pub const F_WRLCK: libc::c_short = 3; | |
65 | pub const F_SETLK: libc::c_int = 12; | |
66 | pub const F_SETLKW: libc::c_int = 13; | |
67 | } | |
68 | ||
c34b1796 AL |
69 | #[cfg(any(target_os = "dragonfly", |
70 | target_os = "bitrig", | |
c1a9b12d | 71 | target_os = "netbsd", |
c34b1796 | 72 | target_os = "openbsd"))] |
1a4d82fc JJ |
73 | mod os { |
74 | use libc; | |
75 | ||
76 | pub struct flock { | |
77 | pub l_start: libc::off_t, | |
78 | pub l_len: libc::off_t, | |
79 | pub l_pid: libc::pid_t, | |
80 | pub l_type: libc::c_short, | |
81 | pub l_whence: libc::c_short, | |
82 | ||
83 | // not actually here, but brings in line with freebsd | |
84 | pub l_sysid: libc::c_int, | |
85 | } | |
86 | ||
87 | pub const F_UNLCK: libc::c_short = 2; | |
88 | pub const F_WRLCK: libc::c_short = 3; | |
89 | pub const F_SETLK: libc::c_int = 8; | |
90 | pub const F_SETLKW: libc::c_int = 9; | |
91 | } | |
92 | ||
93 | #[cfg(any(target_os = "macos", target_os = "ios"))] | |
94 | mod os { | |
95 | use libc; | |
96 | ||
97 | pub struct flock { | |
98 | pub l_start: libc::off_t, | |
99 | pub l_len: libc::off_t, | |
100 | pub l_pid: libc::pid_t, | |
101 | pub l_type: libc::c_short, | |
102 | pub l_whence: libc::c_short, | |
103 | ||
104 | // not actually here, but brings in line with freebsd | |
105 | pub l_sysid: libc::c_int, | |
106 | } | |
107 | ||
108 | pub const F_UNLCK: libc::c_short = 2; | |
109 | pub const F_WRLCK: libc::c_short = 3; | |
110 | pub const F_SETLK: libc::c_int = 8; | |
111 | pub const F_SETLKW: libc::c_int = 9; | |
112 | } | |
113 | ||
114 | pub struct Lock { | |
115 | fd: libc::c_int, | |
116 | } | |
117 | ||
118 | impl Lock { | |
119 | pub fn new(p: &Path) -> Lock { | |
c34b1796 AL |
120 | let os: &OsStr = p.as_ref(); |
121 | let buf = CString::new(os.as_bytes()).unwrap(); | |
1a4d82fc JJ |
122 | let fd = unsafe { |
123 | libc::open(buf.as_ptr(), libc::O_RDWR | libc::O_CREAT, | |
92a42be0 | 124 | libc::S_IRWXU as libc::c_int) |
1a4d82fc | 125 | }; |
c34b1796 AL |
126 | assert!(fd > 0, "failed to open lockfile: {}", |
127 | io::Error::last_os_error()); | |
1a4d82fc JJ |
128 | let flock = os::flock { |
129 | l_start: 0, | |
130 | l_len: 0, | |
131 | l_pid: 0, | |
132 | l_whence: libc::SEEK_SET as libc::c_short, | |
133 | l_type: os::F_WRLCK, | |
134 | l_sysid: 0, | |
135 | }; | |
136 | let ret = unsafe { | |
85aaf69f | 137 | libc::fcntl(fd, os::F_SETLKW, &flock) |
1a4d82fc JJ |
138 | }; |
139 | if ret == -1 { | |
c34b1796 | 140 | let err = io::Error::last_os_error(); |
1a4d82fc | 141 | unsafe { libc::close(fd); } |
c34b1796 | 142 | panic!("could not lock `{}`: {}", p.display(), err); |
1a4d82fc JJ |
143 | } |
144 | Lock { fd: fd } | |
145 | } | |
146 | } | |
147 | ||
148 | impl Drop for Lock { | |
149 | fn drop(&mut self) { | |
150 | let flock = os::flock { | |
151 | l_start: 0, | |
152 | l_len: 0, | |
153 | l_pid: 0, | |
154 | l_whence: libc::SEEK_SET as libc::c_short, | |
155 | l_type: os::F_UNLCK, | |
156 | l_sysid: 0, | |
157 | }; | |
158 | unsafe { | |
85aaf69f | 159 | libc::fcntl(self.fd, os::F_SETLK, &flock); |
1a4d82fc JJ |
160 | libc::close(self.fd); |
161 | } | |
162 | } | |
163 | } | |
164 | } | |
165 | ||
166 | #[cfg(windows)] | |
92a42be0 | 167 | #[allow(bad_style)] |
1a4d82fc | 168 | mod imp { |
c34b1796 | 169 | use std::io; |
1a4d82fc | 170 | use std::mem; |
c34b1796 | 171 | use std::os::windows::prelude::*; |
92a42be0 | 172 | use std::os::windows::raw::HANDLE; |
c34b1796 | 173 | use std::path::Path; |
92a42be0 SL |
174 | use std::fs::{File, OpenOptions}; |
175 | ||
176 | type DWORD = u32; | |
177 | type LPOVERLAPPED = *mut OVERLAPPED; | |
178 | type BOOL = i32; | |
179 | const LOCKFILE_EXCLUSIVE_LOCK: DWORD = 0x00000002; | |
180 | ||
181 | #[repr(C)] | |
182 | struct OVERLAPPED { | |
183 | Internal: usize, | |
184 | InternalHigh: usize, | |
185 | Pointer: *mut u8, | |
186 | hEvent: *mut u8, | |
187 | } | |
1a4d82fc | 188 | |
1a4d82fc | 189 | extern "system" { |
92a42be0 SL |
190 | fn LockFileEx(hFile: HANDLE, |
191 | dwFlags: DWORD, | |
192 | dwReserved: DWORD, | |
193 | nNumberOfBytesToLockLow: DWORD, | |
194 | nNumberOfBytesToLockHigh: DWORD, | |
195 | lpOverlapped: LPOVERLAPPED) -> BOOL; | |
1a4d82fc JJ |
196 | } |
197 | ||
198 | pub struct Lock { | |
92a42be0 | 199 | _file: File, |
1a4d82fc JJ |
200 | } |
201 | ||
202 | impl Lock { | |
203 | pub fn new(p: &Path) -> Lock { | |
92a42be0 SL |
204 | let f = OpenOptions::new().read(true).write(true).create(true) |
205 | .open(p).unwrap(); | |
1a4d82fc | 206 | let ret = unsafe { |
92a42be0 SL |
207 | let mut overlapped: OVERLAPPED = mem::zeroed(); |
208 | LockFileEx(f.as_raw_handle(), LOCKFILE_EXCLUSIVE_LOCK, 0, 100, 0, | |
1a4d82fc JJ |
209 | &mut overlapped) |
210 | }; | |
211 | if ret == 0 { | |
c34b1796 | 212 | let err = io::Error::last_os_error(); |
c34b1796 | 213 | panic!("could not lock `{}`: {}", p.display(), err); |
1a4d82fc | 214 | } |
92a42be0 | 215 | Lock { _file: f } |
1a4d82fc JJ |
216 | } |
217 | } | |
218 | } |