filelock/
unix.rs

1extern crate errno;
2extern crate libc;
3
4use std::ffi::CString;
5
6pub struct FileLock {
7    filename: String,
8    fd: libc::c_int,
9}
10
11impl FileLock {
12    pub fn new(filename: &str) -> FileLock {
13        return FileLock {
14            filename: filename.to_string(),
15            fd: 0,
16        };
17    }
18
19    pub fn lock(&mut self) -> Result<(), errno::Errno> {
20        unsafe {
21            #[allow(temporary_cstring_as_ptr)]
22            let fd = libc::open(
23                CString::new(self.filename.as_str()).unwrap().as_ptr(),
24                libc::O_RDWR | libc::O_CREAT,
25                0o644,
26            );
27            if fd < 0 {
28                return Err(errno::errno());
29            }
30            self.fd = fd;
31
32            if libc::flock(fd, libc::LOCK_EX) != 0 {
33                return Err(errno::errno());
34            }
35            return Ok(());
36        }
37    }
38
39    pub fn unlock(&mut self) -> Result<(), errno::Errno> {
40        let fd = self.fd;
41
42        unsafe {
43            if libc::flock(fd, libc::LOCK_UN) != 0 {
44                return Err(errno::errno());
45            }
46
47            if libc::close(fd) != 0 {
48                return Err(errno::errno());
49            }
50        }
51
52        self.fd = 0;
53
54        return Ok(());
55    }
56}
filelock/unix.rs

filelock/
unix.rs
