diff --git a/src/unix/notbsd/linux/mod.rs b/src/unix/notbsd/linux/mod.rs
index daf5641f0304d..ab345afcda8b3 100644
--- a/src/unix/notbsd/linux/mod.rs
+++ b/src/unix/notbsd/linux/mod.rs
@@ -17,9 +17,14 @@ pub type msgqnum_t = ::c_ulong;
 pub type msglen_t = ::c_ulong;
 pub type nfds_t = ::c_ulong;
 pub type nl_item = ::c_int;
-
+pub type idtype_t = ::c_int;
 pub enum fpos64_t {} // TODO: fill this out with a struct
 
+pub const P_PID: ::idtype_t = 1;
+pub const P_PGID: ::idtype_t = 2;
+pub const P_ALL: ::idtype_t = 3;
+
+
 s! {
     pub struct dirent {
         pub d_ino: ::ino_t,
diff --git a/src/unix/notbsd/linux/other/mod.rs b/src/unix/notbsd/linux/other/mod.rs
index 8dc48bc149cc5..b98512476e3c4 100644
--- a/src/unix/notbsd/linux/other/mod.rs
+++ b/src/unix/notbsd/linux/other/mod.rs
@@ -603,6 +603,9 @@ extern {
                                   cpusetsize: ::size_t,
                                   cpuset: *const ::cpu_set_t) -> ::c_int;
     pub fn sched_getcpu() -> ::c_int;
+
+    pub fn waitid(idtype: ::idtype_t, id: ::id_t, infop: *mut ::siginfo_t,
+                  options: ::c_int) -> ::c_int;
 }
 
 cfg_if! {