From b5192437c39ff4d6b75653e11b7c59cd6795439d Mon Sep 17 00:00:00 2001
From: Paul Sajna <paulsajna@gmail.com>
Date: Sun, 4 Mar 2018 09:24:33 -0800
Subject: [PATCH] ftruncate

---
 platform/src/linux/mod.rs | 6 ++++++
 platform/src/redox/mod.rs | 4 ++++
 src/unistd/src/lib.rs     | 2 +-
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/platform/src/linux/mod.rs b/platform/src/linux/mod.rs
index bc429b0b7a..9f2cfb0e02 100644
--- a/platform/src/linux/mod.rs
+++ b/platform/src/linux/mod.rs
@@ -63,6 +63,12 @@ pub fn fsync(fildes: c_int) -> c_int {
     }
 }
 
+pub fn ftruncate(fildes: c_int, length: off_t) -> c_int {
+    unsafe {
+        syscall!(FTRUNCATE, fildes, length) as c_int
+    }
+}
+
 #[cfg(target_arch = "x86_64")]
 pub fn open(path: *const c_char, oflag: c_int, mode: mode_t) -> c_int {
     unsafe {
diff --git a/platform/src/redox/mod.rs b/platform/src/redox/mod.rs
index a2a207e0cd..dd5e89b0ee 100644
--- a/platform/src/redox/mod.rs
+++ b/platform/src/redox/mod.rs
@@ -51,6 +51,10 @@ pub fn fsync(fd: c_int) -> c_int {
     syscall::fsync(fd as usize)? as c_int
 }
 
+pub fn ftruncate(fd: c_int, len: off_t) -> {
+    syscall::ftruncate(fd as usize, len as usize)? as c_int
+}
+
 pub fn open(path: *const c_char, oflag: c_int, mode: mode_t) -> c_int {
     let path = unsafe { c_str(path) };
     syscall::open(path, (oflag as usize) | (mode as usize)).unwrap() as c_int
diff --git a/src/unistd/src/lib.rs b/src/unistd/src/lib.rs
index d965c7d40f..b8858100f6 100644
--- a/src/unistd/src/lib.rs
+++ b/src/unistd/src/lib.rs
@@ -161,7 +161,7 @@ pub extern "C" fn fsync(fildes: c_int) -> c_int {
 
 #[no_mangle]
 pub extern "C" fn ftruncate(fildes: c_int, length: off_t) -> c_int {
-    unimplemented!();
+    platform::ftruncate(fildes, length)
 }
 
 #[no_mangle]