Add process_vm_readv and process_vm_writev

Author: geofft

src/sys/uio.rs

@@ -2,7 +2,7 @@
 #![allow(improper_ctypes)]
 
 use {Errno, Result};
-use libc::{self, c_int, c_void, size_t, off_t};
+use libc::{self, c_int, c_ulong, c_void, size_t, off_t};
 use std::marker::PhantomData;
 use std::os::unix::io::RawFd;
 
@@ -56,6 +56,24 @@ pub fn pread(fd: RawFd, buf: &mut [u8], offset: off_t) -> Result<usize>{
     Errno::result(res).map(|r| r as usize)
 }
 
+pub fn process_vm_writev(pid: libc::pid_t, local_iov: &[IoVec<&[u8]>], remote_iov: &mut [IoVec<&mut [u8]>]) -> Result<usize> {
+    let res = unsafe {
+        libc::process_vm_writev(pid, local_iov.as_ptr() as *const libc::iovec, local_iov.len() as c_ulong,
+                                     remote_iov.as_ptr() as *const libc::iovec, remote_iov.len() as c_ulong, 0)
+    };
+
+    Errno::result(res).map(|r| r as usize)
+}
+
+pub fn process_vm_readv(pid: libc::pid_t, local_iov: &mut [IoVec<&mut [u8]>], remote_iov: &[IoVec<&[u8]>]) -> Result<usize> {
+    let res = unsafe {
+        libc::process_vm_readv(pid, local_iov.as_ptr() as *const libc::iovec, local_iov.len() as c_ulong,
+                                    remote_iov.as_ptr() as *const libc::iovec, remote_iov.len() as c_ulong, 0)
+    };
+
+    Errno::result(res).map(|r| r as usize)
+}
+
 #[repr(C)]
 pub struct IoVec<T>(libc::iovec, PhantomData<T>);