diff --git a/src/unix/bsd/freebsdlike/freebsd/mod.rs b/src/unix/bsd/freebsdlike/freebsd/mod.rs
index 0d0eb3f3b0ff5..da144183ca368 100644
--- a/src/unix/bsd/freebsdlike/freebsd/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/mod.rs
@@ -135,6 +135,11 @@ s! {
         pub ss_size: ::size_t,
         pub ss_flags: ::c_int,
     }
+
+    pub struct mmsghdr {
+        pub msg_hdr: ::msghdr,
+        pub msg_len: ::ssize_t,
+    }
 }
 
 s_no_extra_traits! {
@@ -1205,6 +1210,11 @@ extern {
 
     pub fn dup3(src: ::c_int, dst: ::c_int, flags: ::c_int) -> ::c_int;
     pub fn __xuname(nmln: ::c_int, buf: *mut ::c_void) -> ::c_int;
+
+    pub fn sendmmsg(sockfd: ::c_int, msgvec: *mut ::mmsghdr, vlen: ::size_t,
+                    flags: ::c_int) -> ::ssize_t;
+    pub fn recvmmsg(sockfd: ::c_int, msgvec: *mut ::mmsghdr, vlen: ::size_t,
+                    flags: ::c_int, timeout: *const ::timespec) -> ::ssize_t;
 }
 
 #[link(name = "util")]
diff --git a/src/unix/bsd/netbsdlike/netbsd/mod.rs b/src/unix/bsd/netbsdlike/netbsd/mod.rs
index 36a5366e6824c..28c0a6dcc79ee 100644
--- a/src/unix/bsd/netbsdlike/netbsd/mod.rs
+++ b/src/unix/bsd/netbsdlike/netbsd/mod.rs
@@ -268,6 +268,11 @@ s! {
         pub sdl_slen: ::uint8_t,
         pub sdl_data: [::c_char; 12],
     }
+
+    pub struct mmsghdr {
+        pub msg_hdr: ::msghdr,
+        pub msg_len: ::c_uint,
+    }
 }
 
 s_no_extra_traits! {
@@ -1238,6 +1243,11 @@ extern {
     pub fn settimeofday(tv: *const ::timeval, tz: *const ::c_void) -> ::c_int;
 
     pub fn dup3(src: ::c_int, dst: ::c_int, flags: ::c_int) -> ::c_int;
+
+    pub fn sendmmsg(sockfd: ::c_int, msgvec: *mut ::mmsghdr, vlen: ::c_uint,
+                    flags: ::c_int) -> ::c_int;
+    pub fn recvmmsg(sockfd: ::c_int, msgvec: *mut ::mmsghdr, vlen: ::c_uint,
+                    flags: ::c_int, timeout: *mut ::timespec) -> ::c_int;
 }
 
 #[link(name = "util")]
diff --git a/src/unix/notbsd/android/mod.rs b/src/unix/notbsd/android/mod.rs
index 2213b75b663ed..3fc03ade7318c 100644
--- a/src/unix/notbsd/android/mod.rs
+++ b/src/unix/notbsd/android/mod.rs
@@ -1950,6 +1950,10 @@ extern {
                           f: extern fn(*mut ::c_void) -> *mut ::c_void,
                           value: *mut ::c_void) -> ::c_int;
     pub fn __errno() -> *mut ::c_int;
+    pub fn sendmmsg(sockfd: ::c_int, msgvec: *const ::mmsghdr, vlen: ::c_uint,
+                    flags: ::c_int) -> ::c_int;
+    pub fn recvmmsg(sockfd: ::c_int, msgvec: *mut ::mmsghdr, vlen: ::c_uint,
+                    flags: ::c_int, timeout: *const ::timespec) -> ::c_int;
 }
 
 cfg_if! {
diff --git a/src/unix/notbsd/emscripten/mod.rs b/src/unix/notbsd/emscripten/mod.rs
index 5de7b5ac57608..c084579da67e0 100644
--- a/src/unix/notbsd/emscripten/mod.rs
+++ b/src/unix/notbsd/emscripten/mod.rs
@@ -169,11 +169,6 @@ s! {
         pub msgseg: ::c_ushort,
     }
 
-    pub struct mmsghdr {
-        pub msg_hdr: ::msghdr,
-        pub msg_len: ::c_uint,
-    }
-
     pub struct sembuf {
         pub sem_num: ::c_ushort,
         pub sem_op: ::c_short,
@@ -1648,9 +1643,9 @@ extern {
 
     pub fn getdomainname(name: *mut ::c_char, len: ::size_t) -> ::c_int;
     pub fn setdomainname(name: *const ::c_char, len: ::size_t) -> ::c_int;
-    pub fn sendmmsg(sockfd: ::c_int, msgvec: *mut mmsghdr, vlen: ::c_uint,
+    pub fn sendmmsg(sockfd: ::c_int, msgvec: *mut ::mmsghdr, vlen: ::c_uint,
                     flags: ::c_int) -> ::c_int;
-    pub fn recvmmsg(sockfd: ::c_int, msgvec: *mut mmsghdr, vlen: ::c_uint,
+    pub fn recvmmsg(sockfd: ::c_int, msgvec: *mut ::mmsghdr, vlen: ::c_uint,
                     flags: ::c_int, timeout: *mut ::timespec) -> ::c_int;
     pub fn sync();
     pub fn ioctl(fd: ::c_int, request: ::c_int, ...) -> ::c_int;
diff --git a/src/unix/notbsd/linux/mod.rs b/src/unix/notbsd/linux/mod.rs
index 03192e6278e3d..8abe76135d9a0 100644
--- a/src/unix/notbsd/linux/mod.rs
+++ b/src/unix/notbsd/linux/mod.rs
@@ -191,11 +191,6 @@ s! {
         pub msgseg: ::c_ushort,
     }
 
-    pub struct mmsghdr {
-        pub msg_hdr: ::msghdr,
-        pub msg_len: ::c_uint,
-    }
-
     pub struct sembuf {
         pub sem_num: ::c_ushort,
         pub sem_op: ::c_short,
@@ -2082,9 +2077,9 @@ extern {
     pub fn getdomainname(name: *mut ::c_char, len: ::size_t) -> ::c_int;
     pub fn setdomainname(name: *const ::c_char, len: ::size_t) -> ::c_int;
     pub fn vhangup() -> ::c_int;
-    pub fn sendmmsg(sockfd: ::c_int, msgvec: *mut mmsghdr, vlen: ::c_uint,
+    pub fn sendmmsg(sockfd: ::c_int, msgvec: *mut ::mmsghdr, vlen: ::c_uint,
                     flags: ::c_int) -> ::c_int;
-    pub fn recvmmsg(sockfd: ::c_int, msgvec: *mut mmsghdr, vlen: ::c_uint,
+    pub fn recvmmsg(sockfd: ::c_int, msgvec: *mut ::mmsghdr, vlen: ::c_uint,
                     flags: ::c_int, timeout: *mut ::timespec) -> ::c_int;
     pub fn sync();
     pub fn syscall(num: ::c_long, ...) -> ::c_long;
diff --git a/src/unix/notbsd/mod.rs b/src/unix/notbsd/mod.rs
index baabd6e84dadd..4394889256a4d 100644
--- a/src/unix/notbsd/mod.rs
+++ b/src/unix/notbsd/mod.rs
@@ -209,6 +209,11 @@ s! {
         pub ar_pln: u8,
         pub ar_op: u16,
     }
+
+    pub struct mmsghdr {
+        pub msg_hdr: ::msghdr,
+        pub msg_len: ::c_uint,
+    }
 }
 
 s_no_extra_traits!{