Expose mqueue functions for all supported OSes

CHANGELOG.md

@@ -54,6 +54,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
   ([#826](https://github.com/nix-rust/nix/pull/826))
 
 ### Changed
+- Exposed the `mqueue` module for all supported operating systems.
+  ([#834](https://github.com/nix-rust/nix/pull/834))
 - Use native `pipe2` on all BSD targets.  Users should notice no difference.
   ([#777](https://github.com/nix-rust/nix/pull/777))
 - Renamed existing `ptrace` wrappers to encourage namespacing ([#692](https://github.com/nix-rust/nix/pull/692))

src/errno.rs

@@ -103,6 +103,10 @@ impl ErrnoSentinel for i64 {
     fn sentinel() -> Self { -1 }
 }
 
+impl ErrnoSentinel for *mut libc::c_void {
+    fn sentinel() -> Self { (-1 as isize) as *mut libc::c_void }
+}
+
 impl error::Error for Errno {
     fn description(&self) -> &str {
         self.desc()

src/lib.rs

@@ -31,7 +31,11 @@ pub mod fcntl;
 #[cfg(any(target_os = "linux", target_os = "android"))]
 pub mod mount;
 
-#[cfg(target_os = "linux")]
+#[cfg(any(target_os = "dragonfly",
+          target_os = "freebsd",
+          target_os = "fushsia",
+          target_os = "linux",
+          target_os = "netbsd"))]
 pub mod mqueue;
 
 pub mod pty;

src/mqueue.rs

@@ -5,7 +5,7 @@
 use Result;
 use errno::Errno;
 
-use libc::{self, c_char, c_long, mode_t, mqd_t, size_t};
+use libc::{self, c_char, c_long, mqd_t, size_t};
 use std::ffi::CString;
 use sys::stat::Mode;
 use std::mem;
@@ -76,7 +76,7 @@ pub fn mq_open(name: &CString,
         Some(mq_attr) => unsafe {
             libc::mq_open(name.as_ptr(),
                           oflag.bits(),
-                          mode.bits() as mode_t,
+                          mode.bits() as libc::c_int,
                           &mq_attr.mq_attr as *const libc::mq_attr)
         },
         None => unsafe { libc::mq_open(name.as_ptr(), oflag.bits()) },

test/test.rs

@@ -11,7 +11,11 @@ extern crate tempfile;
 
 mod sys;
 mod test_fcntl;
-#[cfg(target_os = "linux")]
+#[cfg(any(target_os = "dragonfly",
+          target_os = "freebsd",
+          target_os = "fushsia",
+          target_os = "linux",
+          target_os = "netbsd"))]
 mod test_mq;
 mod test_net;
 mod test_nix_path;

test/test_mq.rs

@@ -15,15 +15,19 @@ fn test_mq_send_and_receive() {
     let attr =  MqAttr::new(0, 10, MSG_SIZE, 0);
     let mq_name= &CString::new(b"/a_nix_test_queue".as_ref()).unwrap();
 
-    let mqd0 = mq_open(mq_name, MQ_OFlag::O_CREAT | MQ_OFlag::O_WRONLY,
-                       Mode::S_IWUSR | Mode::S_IRUSR | Mode::S_IRGRP | Mode::S_IROTH,
-                       Some(&attr)).unwrap();
+    let oflag0 = MQ_OFlag::O_CREAT | MQ_OFlag::O_WRONLY;
+    let mode = Mode::S_IWUSR | Mode::S_IRUSR | Mode::S_IRGRP | Mode::S_IROTH;
+    let r0 = mq_open(mq_name, oflag0, mode, Some(&attr));
+    if let Err(Sys(ENOSYS)) = r0 {
+        println!("message queues not supported or module not loaded?");
+        return;
+    };
+    let mqd0 = r0.unwrap();
     let msg_to_send = "msg_1";
     mq_send(mqd0, msg_to_send.as_bytes(), 1).unwrap();
 
-    let mqd1 = mq_open(mq_name, MQ_OFlag::O_CREAT | MQ_OFlag::O_RDONLY,
-                       Mode::S_IWUSR | Mode::S_IRUSR | Mode::S_IRGRP | Mode::S_IROTH,
-                       Some(&attr)).unwrap();
+    let oflag1 = MQ_OFlag::O_CREAT | MQ_OFlag::O_RDONLY;
+    let mqd1 = mq_open(mq_name, oflag1, mode, Some(&attr)).unwrap();
     let mut buf = [0u8; 32];
     let mut prio = 0u32;
     let len = mq_receive(mqd1, &mut buf, &mut prio).unwrap();
@@ -40,7 +44,15 @@ fn test_mq_getattr() {
     const MSG_SIZE: c_long =  32;
     let initial_attr =  MqAttr::new(0, 10, MSG_SIZE, 0);
     let mq_name = &CString::new(b"/attr_test_get_attr".as_ref()).unwrap();
-    let mqd = mq_open(mq_name, MQ_OFlag::O_CREAT | MQ_OFlag::O_WRONLY, Mode::S_IWUSR | Mode::S_IRUSR | Mode::S_IRGRP | Mode::S_IROTH, Some(&initial_attr)).unwrap();
+    let oflag = MQ_OFlag::O_CREAT | MQ_OFlag::O_WRONLY;
+    let mode = Mode::S_IWUSR | Mode::S_IRUSR | Mode::S_IRGRP | Mode::S_IROTH;
+    let r = mq_open(mq_name, oflag, mode, Some(&initial_attr));
+    if let Err(Sys(ENOSYS)) = r {
+        println!("message queues not supported or module not loaded?");
+        return;
+    };
+    let mqd = r.unwrap();
+
     let read_attr = mq_getattr(mqd);
     assert!(read_attr.unwrap() == initial_attr);
     mq_close(mqd).unwrap();
@@ -53,7 +65,14 @@ fn test_mq_setattr() {
     const MSG_SIZE: c_long =  32;
     let initial_attr =  MqAttr::new(0, 10, MSG_SIZE, 0);
     let mq_name = &CString::new(b"/attr_test_get_attr".as_ref()).unwrap();
-    let mqd = mq_open(mq_name, MQ_OFlag::O_CREAT | MQ_OFlag::O_WRONLY, Mode::S_IWUSR | Mode::S_IRUSR | Mode::S_IRGRP | Mode::S_IROTH, Some(&initial_attr)).unwrap();
+    let oflag = MQ_OFlag::O_CREAT | MQ_OFlag::O_WRONLY;
+    let mode = Mode::S_IWUSR | Mode::S_IRUSR | Mode::S_IRGRP | Mode::S_IROTH;
+    let r = mq_open(mq_name, oflag, mode, Some(&initial_attr));
+    if let Err(Sys(ENOSYS)) = r {
+        println!("message queues not supported or module not loaded?");
+        return;
+    };
+    let mqd = r.unwrap();
 
     let new_attr =  MqAttr::new(0, 20, MSG_SIZE * 2, 100);
     let old_attr = mq_setattr(mqd, &new_attr);
@@ -81,7 +100,14 @@ fn test_mq_set_nonblocking() {
     const MSG_SIZE: c_long =  32;
     let initial_attr =  MqAttr::new(0, 10, MSG_SIZE, 0);
     let mq_name = &CString::new(b"/attr_test_get_attr".as_ref()).unwrap();
-    let mqd = mq_open(mq_name, MQ_OFlag::O_CREAT | MQ_OFlag::O_WRONLY, Mode::S_IWUSR | Mode::S_IRUSR | Mode::S_IRGRP | Mode::S_IROTH, Some(&initial_attr)).unwrap();
+    let oflag = MQ_OFlag::O_CREAT | MQ_OFlag::O_WRONLY;
+    let mode = Mode::S_IWUSR | Mode::S_IRUSR | Mode::S_IRGRP | Mode::S_IROTH;
+    let r = mq_open(mq_name, oflag, mode, Some(&initial_attr));
+    if let Err(Sys(ENOSYS)) = r {
+        println!("message queues not supported or module not loaded?");
+        return;
+    };
+    let mqd = r.unwrap();
     mq_set_nonblock(mqd).unwrap();
     let new_attr = mq_getattr(mqd);
     assert!(new_attr.unwrap().flags() == MQ_OFlag::O_NONBLOCK.bits() as c_long);
@@ -97,7 +123,14 @@ fn test_mq_unlink() {
     let initial_attr =  MqAttr::new(0, 10, MSG_SIZE, 0);
     let mq_name_opened = &CString::new(b"/mq_unlink_test".as_ref()).unwrap();
     let mq_name_not_opened = &CString::new(b"/mq_unlink_test".as_ref()).unwrap();
-    let mqd = mq_open(mq_name_opened, MQ_OFlag::O_CREAT | MQ_OFlag::O_WRONLY, Mode::S_IWUSR | Mode::S_IRUSR | Mode::S_IRGRP | Mode::S_IROTH, Some(&initial_attr)).unwrap();
+    let oflag = MQ_OFlag::O_CREAT | MQ_OFlag::O_WRONLY;
+    let mode = Mode::S_IWUSR | Mode::S_IRUSR | Mode::S_IRGRP | Mode::S_IROTH;
+    let r = mq_open(mq_name_opened, oflag, mode, Some(&initial_attr));
+    if let Err(Sys(ENOSYS)) = r {
+        println!("message queues not supported or module not loaded?");
+        return;
+    };
+    let mqd = r.unwrap();
 
     let res_unlink = mq_unlink(mq_name_opened);
     assert!(res_unlink == Ok(()) );
@@ -108,5 +141,4 @@ fn test_mq_unlink() {
     mq_close(mqd).unwrap();
     let res_unlink_after_close = mq_unlink(mq_name_opened);
     assert!(res_unlink_after_close == Err(Sys(ENOENT)) );
-
 }