diff --git a/src/unix/bsd/freebsdlike/mod.rs b/src/unix/bsd/freebsdlike/mod.rs
index ac4cda7e..dfa33cf1 100644
--- a/src/unix/bsd/freebsdlike/mod.rs
+++ b/src/unix/bsd/freebsdlike/mod.rs
@@ -588,6 +588,11 @@ extern {
                     hdtr: *mut ::sf_hdtr,
                     sbytes: *mut ::off_t,
                     flags: ::c_int) -> ::c_int;
+    pub fn sigtimedwait(set: *const sigset_t,
+                        info: *mut siginfo_t,
+                        timeout: *const ::timespec) -> ::c_int;
+    pub fn sigwaitinfo(set: *const sigset_t,
+                       info: *mut siginfo_t) -> ::c_int;
 }
 
 cfg_if! {
diff --git a/src/unix/bsd/openbsdlike/netbsd.rs b/src/unix/bsd/openbsdlike/netbsd.rs
index b350f1d7..3640d2ec 100644
--- a/src/unix/bsd/openbsdlike/netbsd.rs
+++ b/src/unix/bsd/openbsdlike/netbsd.rs
@@ -378,4 +378,10 @@ extern {
     pub fn pthread_attr_getstack(attr: *const ::pthread_attr_t,
                                  stackaddr: *mut *mut ::c_void,
                                  stacksize: *mut ::size_t) -> ::c_int;
+    #[link_name = "__sigtimedwait50"]
+    pub fn sigtimedwait(set: *const sigset_t,
+                        info: *mut siginfo_t,
+                        timeout: *const ::timespec) -> ::c_int;
+    pub fn sigwaitinfo(set: *const sigset_t,
+                       info: *mut siginfo_t) -> ::c_int;
 }
diff --git a/src/unix/mod.rs b/src/unix/mod.rs
index dd8351d2..f65efd63 100644
--- a/src/unix/mod.rs
+++ b/src/unix/mod.rs
@@ -509,6 +509,10 @@ extern {
     #[cfg_attr(target_os = "netbsd", link_name = "__sigaltstack14")]
     pub fn sigaltstack(ss: *const stack_t,
                        oss: *mut stack_t) -> ::c_int;
+    #[cfg_attr(all(target_os = "macos", target_arch ="x86"),
+               link_name = "sigwait$UNIX2003")]
+    pub fn sigwait(set: *const sigset_t,
+                   sig: *mut ::c_int) -> ::c_int;
 
     #[cfg_attr(target_os = "netbsd", link_name = "__utimes50")]
     pub fn utimes(filename: *const ::c_char,
diff --git a/src/unix/notbsd/linux/mod.rs b/src/unix/notbsd/linux/mod.rs
index 510a33d0..ba7f883a 100644
--- a/src/unix/notbsd/linux/mod.rs
+++ b/src/unix/notbsd/linux/mod.rs
@@ -542,6 +542,11 @@ extern {
     pub fn setns(fd: ::c_int, nstype: ::c_int) -> ::c_int;
     pub fn mkostemp(template: *mut ::c_char, flags: ::c_int) -> ::c_int;
     pub fn mkostemps(template: *mut ::c_char, suffixlen: ::c_int, flags: ::c_int) -> ::c_int;
+    pub fn sigtimedwait(set: *const sigset_t,
+                        info: *mut siginfo_t,
+                        timeout: *const ::timespec) -> ::c_int;
+    pub fn sigwaitinfo(set: *const sigset_t,
+                       info: *mut siginfo_t) -> ::c_int;
 }
 
 cfg_if! {