Auto merge of #1388 - tormol:mq_time, r=gnzlbg

Add more posix message queue functions for Linux and all for solarish

I'm not able to run the tests locally (likely due to too old headers on Ubuntu 18.04), but I've tested my [posixmq crate](https://github.com/tormol/posixmq/tree/0decb7c82dd472024c7e90fd8121671881a81ae2) with these functions on Linux and OmniOS.

Author: bors

src/unix/linux_like/linux/mod.rs

@@ -2294,10 +2294,20 @@ extern {
                       msg_ptr: *mut ::c_char,
                       msg_len: ::size_t,
                       msq_prio: *mut ::c_uint) -> ::ssize_t;
+    pub fn mq_timedreceive(mqd: ::mqd_t,
+                           msg_ptr: *mut ::c_char,
+                           msg_len: ::size_t,
+                           msq_prio: *mut ::c_uint,
+                           abs_timeout: *const ::timespec) -> ::ssize_t;
     pub fn mq_send(mqd: ::mqd_t,
                    msg_ptr: *const ::c_char,
                    msg_len: ::size_t,
                    msq_prio: ::c_uint) -> ::c_int;
+    pub fn mq_timedsend(mqd: ::mqd_t,
+                        msg_ptr: *const ::c_char,
+                        msg_len: ::size_t,
+                        msq_prio: ::c_uint,
+                        abs_timeout: *const ::timespec) -> ::c_int;
     pub fn mq_getattr(mqd: ::mqd_t, attr: *mut ::mq_attr) -> ::c_int;
     pub fn mq_setattr(mqd: ::mqd_t,
                       newattr: *const ::mq_attr,

src/unix/solarish/mod.rs

@@ -31,6 +31,7 @@ pub type pthread_t = ::c_uint;
 pub type pthread_key_t = ::c_uint;
 pub type blksize_t = ::c_int;
 pub type nl_item = ::c_int;
+pub type mqd_t = *mut ::c_void;
 pub type id_t = ::c_int;
 pub type idtype_t = ::c_uint;
 
@@ -331,6 +332,14 @@ s! {
         pub if_name: *mut ::c_char,
     }
 
+    pub struct mq_attr {
+        pub mq_flags: ::c_long,
+        pub mq_maxmsg: ::c_long,
+        pub mq_msgsize: ::c_long,
+        pub mq_curmsgs: ::c_long,
+        _pad: [::c_int; 4]
+    }
+
     pub struct port_event {
         pub portev_events: ::c_int,
         pub portev_source: ::c_ushort,
@@ -1937,6 +1946,31 @@ extern {
     pub fn recvmsg(fd: ::c_int, msg: *mut ::msghdr, flags: ::c_int)
                    -> ::ssize_t;
 
+    pub fn mq_open(name: *const ::c_char, oflag: ::c_int, ...) -> ::mqd_t;
+    pub fn mq_close(mqd: ::mqd_t) -> ::c_int;
+    pub fn mq_unlink(name: *const ::c_char) -> ::c_int;
+    pub fn mq_receive(mqd: ::mqd_t,
+                      msg_ptr: *mut ::c_char,
+                      msg_len: ::size_t,
+                      msq_prio: *mut ::c_uint) -> ::ssize_t;
+    pub fn mq_timedreceive(mqd: ::mqd_t,
+                           msg_ptr: *mut ::c_char,
+                           msg_len: ::size_t,
+                           msq_prio: *mut ::c_uint,
+                           abs_timeout: *const ::timespec) -> ::ssize_t;
+    pub fn mq_send(mqd: ::mqd_t,
+                   msg_ptr: *const ::c_char,
+                   msg_len: ::size_t,
+                   msq_prio: ::c_uint) -> ::c_int;
+    pub fn mq_timedsend(mqd: ::mqd_t,
+                        msg_ptr: *const ::c_char,
+                        msg_len: ::size_t,
+                        msq_prio: ::c_uint,
+                        abs_timeout: *const ::timespec) -> ::c_int;
+    pub fn mq_getattr(mqd: ::mqd_t, attr: *mut ::mq_attr) -> ::c_int;
+    pub fn mq_setattr(mqd: ::mqd_t,
+                      newattr: *const ::mq_attr,
+                      oldattr: *mut ::mq_attr) -> ::c_int;
     pub fn port_create() -> ::c_int;
     pub fn port_associate(port: ::c_int, source: ::c_int, object: ::uintptr_t,
                           events: ::c_int, user: *mut ::c_void) -> ::c_int;