diff --git a/src/libos/src/syscall/mod.rs b/src/libos/src/syscall/mod.rs
index 44610828..03e0ff64 100644
--- a/src/libos/src/syscall/mod.rs
+++ b/src/libos/src/syscall/mod.rs
@@ -135,6 +135,13 @@ pub extern "C" fn dispatch_syscall(
             arg2 as c_int,
             arg3 as c_int,
         ),
+        SYS_EPOLL_PWAIT => do_epoll_pwait(
+            arg0 as c_int,
+            arg1 as *mut libc::epoll_event,
+            arg2 as c_int,
+            arg3 as c_int,
+            arg4 as *const usize, //TODO:add sigset_t
+        ),
 
         // process
         SYS_EXIT => do_exit(arg0 as i32),
@@ -1418,6 +1425,18 @@ fn do_epoll_wait(
     Ok(count as isize)
 }
 
+fn do_epoll_pwait(
+    epfd: c_int,
+    events: *mut libc::epoll_event,
+    maxevents: c_int,
+    timeout: c_int,
+    sigmask: *const usize, //TODO:add sigset_t
+) -> Result<isize> {
+    info!("epoll_pwait");
+    //TODO:add signal support
+    do_epoll_wait(epfd, events, maxevents, 0)
+}
+
 fn do_uname(name: *mut utsname_t) -> Result<isize> {
     check_mut_ptr(name)?;
     let name = unsafe { &mut *name };
diff --git a/test/server_epoll/main.c b/test/server_epoll/main.c
index 59b14753..eef633c3 100644
--- a/test/server_epoll/main.c
+++ b/test/server_epoll/main.c
@@ -89,7 +89,7 @@ main(int argc, char *argv[]) {
 	/* The event loop */
 	int done_count = 0;
 	while (done_count < proc_num) {
-		int n = epoll_wait(efd, events, MAXEVENTS, -1);
+		int n = epoll_pwait(efd, events, MAXEVENTS, -1, NULL);
 		for (int i = 0; i < n; i++) {
 			if ((events[i].events & EPOLLERR) ||
 				(events[i].events & EPOLLHUP) ||