From 4680d50a8a225309fc706d032a8dc5e71f819ab5 Mon Sep 17 00:00:00 2001
From: Kamal Marhubi <kamal@marhubi.com>
Date: Tue, 9 Feb 2016 19:36:04 -0500
Subject: linux: Add sendfile(2)

---
 Cargo.toml            |  3 ++-
 src/sys/mod.rs        |  3 +++
 src/sys/sendfile.rs   | 12 ++++++++++++
 test/test.rs          |  3 +++
 test/test_sendfile.rs | 30 ++++++++++++++++++++++++++++++
 5 files changed, 50 insertions(+), 1 deletion(-)
 create mode 100644 src/sys/sendfile.rs
 create mode 100644 test/test_sendfile.rs

diff --git a/Cargo.toml b/Cargo.toml
index 5df27ec8..093468da 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,12 +20,13 @@ preadv_pwritev = []
 signalfd = []
 
 [dependencies]
-libc     = "0.2.4"
+libc     = "0.2.7"
 bitflags = "0.3.3"
 
 [dev-dependencies]
 rand = "0.3.8"
 tempdir = "0.3"
+tempfile = "2"
 nix-test = { path = "nix-test" }
 
 [[test]]
diff --git a/src/sys/mod.rs b/src/sys/mod.rs
index c7fdc4dc..de449b76 100644
--- a/src/sys/mod.rs
+++ b/src/sys/mod.rs
@@ -16,6 +16,9 @@ pub mod memfd;
 #[cfg(not(any(target_os = "ios", target_os = "freebsd", target_os = "dragonfly")))]
 pub mod ioctl;
 
+#[cfg(any(target_os = "linux", target_os = "android"))]
+pub mod sendfile;
+
 pub mod signal;
 
 #[cfg(any(target_os = "linux", target_os = "android"))]
diff --git a/src/sys/sendfile.rs b/src/sys/sendfile.rs
new file mode 100644
index 00000000..2c39ea90
--- /dev/null
+++ b/src/sys/sendfile.rs
@@ -0,0 +1,12 @@
+use std::os::unix::io::RawFd;
+use std::ptr;
+
+use libc::{self, off_t};
+
+use {Errno, Result};
+
+pub fn sendfile(out_fd: RawFd, in_fd: RawFd, offset: Option<&mut off_t>, count: usize) -> Result<usize> {
+    let offset = offset.map(|offset| offset as *mut _).unwrap_or(ptr::null_mut());
+    let ret = unsafe { libc::sendfile(out_fd, in_fd, offset, count) };
+    Errno::result(ret).map(|r| r as usize)
+}
diff --git a/test/test.rs b/test/test.rs
index b5e9847e..53f61fb5 100644
--- a/test/test.rs
+++ b/test/test.rs
@@ -3,12 +3,15 @@ extern crate nix;
 extern crate libc;
 extern crate rand;
 extern crate tempdir;
+extern crate tempfile;
 
 extern crate nix_test as nixtest;
 
 mod sys;
 mod test_net;
 mod test_nix_path;
+#[cfg(any(target_os = "linux", target_os = "android"))]
+mod test_sendfile;
 mod test_stat;
 mod test_unistd;
 
diff --git a/test/test_sendfile.rs b/test/test_sendfile.rs
new file mode 100644
index 00000000..7db65b9a
--- /dev/null
+++ b/test/test_sendfile.rs
@@ -0,0 +1,30 @@
+use std::io::prelude::*;
+use std::os::unix::prelude::*;
+
+use tempfile::tempfile;
+
+use libc::off_t;
+
+use nix::unistd::{close, pipe, read};
+use nix::sys::sendfile::sendfile;
+
+#[test]
+fn test_sendfile() {
+    const CONTENTS: &'static [u8] = b"abcdef123456";
+    let mut tmp = tempfile().unwrap();
+    tmp.write(CONTENTS).unwrap();
+
+    let (rd, wr) = pipe().unwrap();
+    let mut offset: off_t = 5;
+    let res = sendfile(wr, tmp.as_raw_fd(), Some(&mut offset), 2).unwrap();
+
+    assert_eq!(2, res);
+
+    let mut buf = [0u8; 1024];
+    assert_eq!(2, read(rd, &mut buf).unwrap());
+    assert_eq!(b"f1", &buf[0..2]);
+    assert_eq!(7, offset);
+
+    close(rd).unwrap();
+    close(wr).unwrap();
+}
-- 
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