Add recvmsg (stub on redox)

src/header/sys_socket/mod.rs

@@ -167,6 +167,11 @@ pub unsafe extern "C" fn recvfrom(
     )
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn recvmsg(socket: c_int, msg: *mut msghdr, flags: c_int) -> ssize_t {
+    Sys::recvmsg(socket, msg, flags)
+}
+
 #[no_mangle]
 pub unsafe extern "C" fn send(
     socket: c_int,

src/platform/linux/socket.rs

@@ -75,6 +75,10 @@ impl PalSocket for Sys {
         )) as ssize_t
     }
 
+    unsafe fn recvmsg(socket: c_int, msg: *mut msghdr, flags: c_int) -> ssize_t {
+        e(syscall!(RECVMSG, socket, msg, flags)) as ssize_t
+    }
+
     unsafe fn sendmsg(socket: c_int, msg: *const msghdr, flags: c_int) -> ssize_t {
         e(syscall!(SENDMSG, socket, msg, flags)) as ssize_t
     }

src/platform/pal/socket.rs

@@ -39,6 +39,8 @@ pub trait PalSocket: Pal {
         address_len: *mut socklen_t,
     ) -> ssize_t;
 
+    unsafe fn recvmsg(socket: c_int, msg: *mut msghdr, flags: c_int) -> ssize_t;
+
     unsafe fn sendmsg(socket: c_int, msg: *const msghdr, flags: c_int) -> ssize_t;
 
     unsafe fn sendto(

src/platform/redox/socket.rs

@@ -316,7 +316,15 @@ impl PalSocket for Sys {
         }
     }
 
+    unsafe fn recvmsg(socket: c_int, msg: *mut msghdr, flags: c_int) -> ssize_t {
+        //TODO: implement recvfrom with recvmsg
+        eprintln!("recvmsg not implemented on redox");
+        errno = syscall::ENOSYS;
+        return -1;
+    }
+
     unsafe fn sendmsg(socket: c_int, msg: *const msghdr, flags: c_int) -> ssize_t {
+        //TODO: implement sendto with sendmsg
         eprintln!("sendmsg not implemented on redox");
         errno = syscall::ENOSYS;
         return -1;