1 files changed, 97 insertions, 0 deletions
diff --git a/src/mq.rs b/src/mq.rs
new file mode 100644
index 00000000..63078192
--- /dev/null
+++ b/src/mq.rs
@@ -0,0 +1,97 @@
+use {Error, Result, from_ffi};
+use errno::Errno;
+
+use libc::{c_int, c_long, c_char, size_t, mode_t, strlen};
+use std::ffi::CString;
+use sys::stat::Mode;
+
+pub use self::consts::*;
+
+pub type MQd = c_int;
+
+#[cfg(target_os = "linux")]
+mod consts {
+    use libc::c_int;
+
+    bitflags!(
+        flags MQ_OFlag: c_int {
+            const O_RDONLY    = 0o00000000,
+            const O_WRONLY    = 0o00000001,
+            const O_RDWR      = 0o00000002,
+            const O_CREAT     = 0o00000100,
+            const O_EXCL      = 0o00000200,
+            const O_NONBLOCK  = 0o00004000,
+            const O_CLOEXEC   = 0o02000000,
+        }
+    );
+
+    bitflags!(
+        flags FdFlag: c_int {
+            const FD_CLOEXEC = 1
+        }
+    );
+}
+
+mod ffi {
+    use libc::{c_char, size_t, ssize_t, c_uint, c_int, mode_t};
+    use super::MQd;
+    use super::MqAttr;
+
+    extern {
+        pub fn mq_open(name: *const c_char, oflag: c_int, mode: mode_t, attr: *const MqAttr) -> MQd;
+
+        pub fn mq_close (mqdes: MQd) -> c_int;
+
+        pub fn mq_receive (mqdes: MQd, msg_ptr: *const c_char, msg_len: size_t, msq_prio: *const c_uint) -> ssize_t;
+
+        pub fn mq_send (mqdes: MQd, msg_ptr: *const c_char, msg_len: size_t, msq_prio: c_uint) -> c_int;
+    }
+}
+
+#[repr(C)]
+#[derive(Clone, Copy, Debug)]
+pub struct MqAttr {
+    pub mq_flags: c_long,
+    pub mq_maxmsg: c_long,
+    pub mq_msgsize: c_long,
+    pub mq_curmsgs: c_long,
+}
+
+#[inline]
+pub fn mq_open(name: &CString, oflag: MQ_OFlag, mode: Mode, attr: &MqAttr) -> Result<MQd> {
+    let res = unsafe { ffi::mq_open(name.as_ptr(), oflag.bits(), mode.bits() as mode_t, attr as *const MqAttr) };
+
+    if res < 0 {
+        return Err(Error::Sys(Errno::last()));
+    }
+
+    Ok(res)
+}
+
+pub fn mq_close(mqdes: MQd) -> Result<()>  {
+    let res = unsafe { ffi::mq_close(mqdes) };
+    from_ffi(res)
+}
+
+
+pub fn mq_receive(mqdes: MQd, message: &mut [u8], msq_prio: u32) -> Result<usize> {
+    let len = message.len() as size_t;
+    let res = unsafe { ffi::mq_receive(mqdes, message.as_mut_ptr() as *mut c_char, len, &msq_prio) };
+
+    if res < 0 {
+        return Err(Error::Sys(Errno::last()));
+    }
+
+    Ok(res as usize)
+}
+
+pub fn mq_send(mqdes: MQd, message: &CString, msq_prio: u32) -> Result<usize> {
+    let len = unsafe { strlen(message.as_ptr()) as size_t };
+    let res = unsafe { ffi::mq_send(mqdes, message.as_ptr(), len, msq_prio) };
+
+    if res < 0 {
+        return Err(Error::Sys(Errno::last()));
+    }
+
+    Ok(res as usize)
+}