Add process_vm_readv and process_vm_writev system calls

Author: jvns

src/unix/notbsd/mod.rs

@@ -800,6 +800,18 @@ extern {
     pub fn setrlimit64(resource: ::c_int, rlim: *const rlimit64) -> ::c_int;
     pub fn stat64(path: *const c_char, buf: *mut stat64) -> ::c_int;
     pub fn eventfd(init: ::c_uint, flags: ::c_int) -> ::c_int;
+    pub fn process_vm_readv(pid: ::pid_t,
+                            local_iov: *const ::iovec,
+                            liovcnt: ::c_ulong,
+                            remote_iov: *const ::iovec,
+                            riovcnt: ::c_ulong,
+                            flags: ::c_ulong) -> isize;
+    pub fn process_vm_writev(pid: ::pid_t,
+                             local_iov: *const ::iovec,
+                             liovcnt: ::c_ulong,
+                             remote_iov: *const ::iovec,
+                             riovcnt: ::c_ulong,
+                             flags: ::c_ulong) -> isize;
 }
 
 cfg_if! {