diff --git a/src/libos/src/net/syscalls.rs b/src/libos/src/net/syscalls.rs
index eb4f49f8..fe02a6d4 100644
--- a/src/libos/src/net/syscalls.rs
+++ b/src/libos/src/net/syscalls.rs
@@ -7,8 +7,9 @@ use super::io_multiplexing::{AsEpollFile, EpollCtl, EpollFile, EpollFlags, FdSet
 use fs::{CreationFlags, File, FileDesc, FileRef};
 use misc::resource_t;
 use process::Process;
+use signal::{sigset_t, SigSet};
 use std::convert::TryFrom;
-use time::timeval_t;
+use time::{timespec_t, timeval_t};
 use util::mem_util::from_user;
 
 pub fn do_socket(domain: c_int, socket_type: c_int, protocol: c_int) -> Result<isize> {
@@ -714,7 +715,40 @@ pub fn do_select(
     ret
 }
 
+pub fn do_ppoll(
+    fds: *mut libc::pollfd,
+    nfds: libc::nfds_t,
+    timeout_ts: *const timespec_t,
+    sigmask: *const sigset_t,
+) -> Result<isize> {
+    let mut timeout = if timeout_ts.is_null() {
+        None
+    } else {
+        from_user::check_ptr(timeout_ts)?;
+        let timeout_ts = unsafe { &*timeout_ts };
+        Some(timeout_ts.as_duration())
+    };
+    if !sigmask.is_null() {
+        warn!("ppoll sigmask is not supported!");
+    }
+    do_poll_common(fds, nfds, timeout.as_mut(), None)
+}
+
 pub fn do_poll(fds: *mut libc::pollfd, nfds: libc::nfds_t, timeout_ms: c_int) -> Result<isize> {
+    let mut timeout = if timeout_ms >= 0 {
+        Some(Duration::from_millis(timeout_ms as u64))
+    } else {
+        None
+    };
+    do_poll_common(fds, nfds, timeout.as_mut(), None)
+}
+
+fn do_poll_common(
+    fds: *mut libc::pollfd,
+    nfds: libc::nfds_t,
+    timeout: Option<&mut Duration>,
+    sigmask: Option<SigSet>,
+) -> Result<isize> {
     // It behaves like sleep when fds is null and nfds is zero.
     if !fds.is_null() || nfds != 0 {
         from_user::check_mut_array(fds, nfds as usize)?;
@@ -737,13 +771,7 @@ pub fn do_poll(fds: *mut libc::pollfd, nfds: libc::nfds_t, timeout_ms: c_int) ->
         .map(|raw| PollFd::from_raw(raw))
         .collect();
 
-    let mut timeout = if timeout_ms >= 0 {
-        Some(Duration::from_millis(timeout_ms as u64))
-    } else {
-        None
-    };
-
-    let count = io_multiplexing::do_poll_new(&poll_fds, timeout.as_mut())?;
+    let count = io_multiplexing::do_poll_new(&poll_fds, timeout)?;
 
     for (raw_poll_fd, poll_fd) in raw_poll_fds.iter_mut().zip(poll_fds.iter()) {
         raw_poll_fd.revents = poll_fd.revents().get().to_raw() as i16;
diff --git a/src/libos/src/syscall/mod.rs b/src/libos/src/syscall/mod.rs
index d477cc9a..d71246de 100644
--- a/src/libos/src/syscall/mod.rs
+++ b/src/libos/src/syscall/mod.rs
@@ -38,8 +38,8 @@ use crate::misc::{resource_t, rlimit_t, sysinfo_t, utsname_t, RandFlags};
 use crate::net::{
     do_accept, do_accept4, do_bind, do_connect, do_epoll_create, do_epoll_create1, do_epoll_ctl,
     do_epoll_pwait, do_epoll_wait, do_getpeername, do_getsockname, do_getsockopt, do_listen,
-    do_poll, do_recvfrom, do_recvmsg, do_select, do_sendmmsg, do_sendmsg, do_sendto, do_setsockopt,
-    do_shutdown, do_socket, do_socketpair, mmsghdr, msghdr, msghdr_mut,
+    do_poll, do_ppoll, do_recvfrom, do_recvmsg, do_select, do_sendmmsg, do_sendmsg, do_sendto,
+    do_setsockopt, do_shutdown, do_socket, do_socketpair, mmsghdr, msghdr, msghdr_mut,
 };
 use crate::process::{
     do_arch_prctl, do_clone, do_execve, do_exit, do_exit_group, do_futex, do_get_robust_list,
@@ -359,7 +359,7 @@ macro_rules! process_syscall_table_with_callback {
             (Fchmodat = 268) => do_fchmodat(dirfd: i32, path: *const i8, mode: u16),
             (Faccessat = 269) => do_faccessat(dirfd: i32, path: *const i8, mode: u32, flags: u32),
             (Pselect6 = 270) => handle_unsupported(),
-            (Ppoll = 271) => handle_unsupported(),
+            (Ppoll = 271) => do_ppoll(fds: *mut libc::pollfd, nfds: libc::nfds_t, timeout_ts: *const timespec_t, sigmask: *const sigset_t),
             (Unshare = 272) => handle_unsupported(),
             (SetRobustList = 273) => do_set_robust_list(list_head_ptr: *mut RobustListHead, len: usize),
             (GetRobustList = 274) => do_get_robust_list(tid: pid_t, list_head_ptr_ptr: *mut *mut RobustListHead, len_ptr: *mut usize),