added rudimentary test so people can see how to use it ...

.gitignore

@@ -1,2 +1,3 @@
 target
 Cargo.lock
+.idea

Cargo.toml

@@ -1,12 +1,11 @@
 [package]
 
 name = "pidfile"
-version = "0.1.0"
+version = "0.1.1"
 authors = ["Carl Lerche <[email protected]>"]
 
 [dependencies]
-log = "0.3.0"
-libc = "0.1.6"
-
-[dependencies.nix]
-git = "https://github.com/carllerche/nix-rust"
+log = "0.4.0"
+libc = "0.2.0"
+nix = "0.7.0"
+tempdir = "*"

README.md

@@ -1,3 +1,3 @@
 # Pidfile for Rust
 
-Daemon mutual exclusion
+Daemon mutual exclusion via a PID file

src/ffi_darwin.rs

@@ -1,7 +1,7 @@
 #![allow(non_camel_case_types)]
 
 use libc::{off_t, pid_t, c_int, c_short};
-pub use libc::consts::os::extra::O_SYNC;
+pub use libc::O_SYNC;
 
 #[repr(C)]
 pub struct flock {

src/ffi_linux.rs

@@ -1,7 +1,7 @@
 #![allow(non_camel_case_types)]
 
 use libc::{off_t, pid_t, c_int, c_short};
-pub use libc::consts::os::extra::O_SYNC;
+pub use libc::O_SYNC;
 
 #[repr(C)]
 pub struct flock {

src/file_posix.rs

@@ -56,7 +56,7 @@ macro_rules! nix_check {
         let mut ret;
 
         loop {
-            let res = unsafe { $expr };
+            let res = $expr;
 
             debug!("ffi; expr={}; success={}", stringify!($expr), res.is_ok());
 
@@ -174,16 +174,5 @@ impl Drop for File {
 }
 
 fn from_raw_os_error(err: i32) -> io::Error {
-    use std::mem;
-    // TODO: Remove insane hacks once `std::io::Error::from_os_error` lands
-    //       rust-lang/rust#24028
-    #[allow(dead_code)]
-    enum Repr {
-        Os(i32),
-        Custom(*const ()),
-    }
-
-    unsafe {
-        mem::transmute(Repr::Os(err))
-    }
+    io::Error::from_raw_os_error(err)
 }

src/lib.rs

@@ -1,7 +1,11 @@
+//! Crate allows to lock a pidfile for a process to prevent another from
+//! starting as long the lock is held.
+
 #![crate_name = "pidfile"]
 
 extern crate libc;
 extern crate nix;
+extern crate tempdir;
 
 #[macro_use]
 extern crate log;
@@ -14,7 +18,7 @@ use std::io::Read;
 use std::path::{Path, PathBuf};
 use std::str::FromStr;
 
-#[cfg(any(target_os = "macos", target_os = "ios"))]
+#[cfg(any(target_os = "macos", target_os = "ios", target_os = "freebsd"))]
 #[path = "ffi_darwin.rs"]
 mod ffi;
 
@@ -195,3 +199,42 @@ pub type LockResult<T> = Result<T, LockError>;
 fn pid() -> pid_t {
     unsafe { libc::getpid() }
 }
+
+#[cfg(test)]
+mod tests {
+
+    #[test]
+    fn main() {
+		use std::thread;
+        use at;
+        use tempdir::TempDir;
+
+        let p = TempDir::new("").expect("create temp dir");
+
+        assert!(p.path().exists());
+
+        let p = p.path().join("pidfile");
+
+		// run couple threads
+
+		let allcan = (0 .. 3)
+			.map(|_| {
+                let pc = p.clone();
+				let atit = move || {
+					at(&pc).lock()
+				};
+
+				thread::spawn(atit)
+			})
+			.collect::<Vec<_>>()
+			.into_iter()
+			.map(|t| t.join())
+			.collect::<Vec<_>>()
+            .into_iter()
+            .all(|v| v.is_ok());
+
+		assert!(allcan);
+
+
+    }
+}