Add ppoll()

src/poll.rs

@@ -1,3 +1,6 @@
+use std;
+use std::time::Duration;
+
 use libc;
 use {Errno, Result};
 
@@ -47,3 +50,19 @@ pub fn poll(fds: &mut [PollFd], timeout: libc::c_int) -> Result<libc::c_int> {
 
     Errno::result(res)
 }
+
+pub fn ppoll(fds: &mut [PollFd], timeout: Duration) -> Result<libc::c_int> {
+
+    let timeout = libc::timespec {
+        tv_sec: timeout.as_secs() as libc::time_t,
+        tv_nsec: timeout.subsec_nanos() as libc::c_long,
+    };
+
+    let res = unsafe {
+        libc::ppoll(fds.as_mut_ptr() as *mut libc::pollfd,
+                    fds.len() as libc::nfds_t,
+                    &timeout as *const libc::timespec,
+                    std::ptr::null())
+    };
+    Errno::result(res)
+}