Add shutdown, listen, and getpagesize

src/platform/pal/mod.rs

@@ -75,6 +75,8 @@ pub trait Pal {
 
     fn getgid() -> gid_t;
 
+    fn getpagesize() -> c_int;
+
     fn getpgid(pid: pid_t) -> pid_t;
 
     fn getpid() -> pid_t;

src/platform/pal/socket.rs

@@ -29,6 +29,8 @@ pub trait PalSocket: Pal {
         option_len: *mut socklen_t,
     ) -> c_int;
 
+    fn listen(socket: c_int, backlog: c_int) -> c_int;
+
     unsafe fn recvfrom(
         socket: c_int,
         buf: *mut c_void,
@@ -55,5 +57,7 @@ pub trait PalSocket: Pal {
         option_len: socklen_t,
     ) -> c_int;
 
+    fn shutdown(socket: c_int, how: c_int) -> c_int;
+
     unsafe fn socket(domain: c_int, kind: c_int, protocol: c_int) -> c_int;
 }