From 9ac438b82fee5b2f55a66fa26b2ebd419445a368 Mon Sep 17 00:00:00 2001
From: Markus Jais <markusjais@gmx.de>
Date: Sat, 18 Jul 2015 14:08:32 +0200
Subject: added mq_getattr for Linux

---
 src/mqueue.rs | 33 ++++++++++++++++++++++++++-------
 1 file changed, 26 insertions(+), 7 deletions(-)

(limited to 'src/mqueue.rs')

diff --git a/src/mqueue.rs b/src/mqueue.rs
index 63078192..ee2e5f2d 100644
--- a/src/mqueue.rs
+++ b/src/mqueue.rs
@@ -33,30 +33,40 @@ mod consts {
 }
 
 mod ffi {
-    use libc::{c_char, size_t, ssize_t, c_uint, c_int, mode_t};
+    use libc::{c_char, size_t, ssize_t, c_uint, c_int};
     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;
+    extern "C" {
+        pub fn mq_open(name: *const c_char, oflag: c_int, ...) -> MQd;
 
-        pub fn mq_close (mqdes: MQd) -> c_int;
+        pub fn mq_close (mqd: 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_receive (mqd: 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;
+        pub fn mq_send (mqd: MQd, msg_ptr: *const c_char, msg_len: size_t, msq_prio: c_uint) -> c_int;
+
+        pub fn mq_getattr(mqd: MQd, attr: *mut MqAttr) -> c_int;
     }
 }
 
 #[repr(C)]
-#[derive(Clone, Copy, Debug)]
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
 pub struct MqAttr {
     pub mq_flags: c_long,
     pub mq_maxmsg: c_long,
     pub mq_msgsize: c_long,
     pub mq_curmsgs: c_long,
+    pad: [c_long; 4]
+}
+
+impl MqAttr {
+   pub fn new(mq_flags: c_long, mq_maxmsg: c_long, mq_msgsize: c_long, mq_curmsgs: c_long) -> MqAttr {
+       MqAttr { mq_flags: mq_flags, mq_maxmsg: mq_maxmsg, mq_msgsize: mq_msgsize, mq_curmsgs: mq_curmsgs, pad: [0; 4] }
+   }
 }
 
+
 #[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) };
@@ -95,3 +105,12 @@ pub fn mq_send(mqdes: MQd, message: &CString, msq_prio: u32) -> Result<usize> {
 
     Ok(res as usize)
 }
+
+pub fn mq_getattr(mqd: MQd) -> Result<MqAttr> {
+    let mut attr = MqAttr::new(0, 0, 0, 0);
+    let res = unsafe { ffi::mq_getattr(mqd, &mut attr) };
+    if res < 0 {
+        return Err(Error::Sys(Errno::last()));
+    }
+    Ok(attr)
+}
-- 
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