Change pread/pwrite to take offset as a off_t.

This fixes compile for 32 bit systems like certain ARM

Author: SirVer

src/sys/uio.rs

@@ -3,7 +3,7 @@
 
 use {Result, Error};
 use errno::Errno;
-use libc::{c_int, c_void, size_t};
+use libc::{c_int, c_void, size_t, off_t};
 use std::marker::PhantomData;
 use std::os::unix::io::RawFd;
 
@@ -52,7 +52,7 @@ pub fn readv(fd: RawFd, iov: &mut [IoVec<&mut [u8]>]) -> Result<usize> {
     return Ok(res as usize)
 }
 
-pub fn pwrite(fd: RawFd, buf: &[u8], offset: i64) -> Result<usize> {
+pub fn pwrite(fd: RawFd, buf: &[u8], offset: off_t) -> Result<usize> {
     let res = unsafe {
         ffi::pwrite(fd, buf.as_ptr() as *const c_void, buf.len() as size_t,
                     offset)
@@ -64,7 +64,7 @@ pub fn pwrite(fd: RawFd, buf: &[u8], offset: i64) -> Result<usize> {
     }
 }
 
-pub fn pread(fd: RawFd, buf: &mut [u8], offset: i64) -> Result<usize>{
+pub fn pread(fd: RawFd, buf: &mut [u8], offset: off_t) -> Result<usize>{
     let res = unsafe {
         ffi::pread(fd, buf.as_mut_ptr() as *mut c_void, buf.len() as size_t,
                    offset)