From 8ee6bddf0b8b9b77ecd1e4b8105dc3fe161e6626 Mon Sep 17 00:00:00 2001
From: Ian Douglas Scott <ian@iandouglasscott.com>
Date: Thu, 29 Jun 2017 17:22:36 -0700
Subject: [PATCH 1/2] redox: symlink and readlink

---
 src/libstd/sys/redox/fs.rs           | 14 ++++++++++----
 src/libstd/sys/redox/syscall/flag.rs |  2 ++
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/src/libstd/sys/redox/fs.rs b/src/libstd/sys/redox/fs.rs
index 48d9cdcb2c937..9a16fc1bf66a9 100644
--- a/src/libstd/sys/redox/fs.rs
+++ b/src/libstd/sys/redox/fs.rs
@@ -420,12 +420,18 @@ fn remove_dir_all_recursive(path: &Path) -> io::Result<()> {
 }
 
 pub fn readlink(p: &Path) -> io::Result<PathBuf> {
-    canonicalize(p)
+    let fd = cvt(syscall::open(p.to_str().unwrap(), syscall::O_SYMLINK | syscall::O_RDONLY))?;
+    let mut buf: [u8; 4096] = [0; 4096];
+    let count = cvt(syscall::read(fd, &mut buf))?;
+    cvt(syscall::close(fd))?;
+    Ok(PathBuf::from(unsafe { String::from_utf8_unchecked(Vec::from(&buf[..count])) }))
 }
 
-pub fn symlink(_src: &Path, _dst: &Path) -> io::Result<()> {
-    ::sys_common::util::dumb_print(format_args!("Symlink\n"));
-    unimplemented!();
+pub fn symlink(src: &Path, dst: &Path) -> io::Result<()> {
+    let fd = cvt(syscall::open(dst.to_str().unwrap(), syscall::O_SYMLINK | syscall::O_CREAT | syscall::O_WRONLY | 0o777))?;
+    cvt(syscall::write(fd, src.to_str().unwrap().as_bytes()))?;
+    cvt(syscall::close(fd))?;
+    Ok(())
 }
 
 pub fn link(_src: &Path, _dst: &Path) -> io::Result<()> {
diff --git a/src/libstd/sys/redox/syscall/flag.rs b/src/libstd/sys/redox/syscall/flag.rs
index 9f0d3e6f77955..bd603cfe6ef9d 100644
--- a/src/libstd/sys/redox/syscall/flag.rs
+++ b/src/libstd/sys/redox/syscall/flag.rs
@@ -33,6 +33,7 @@ pub const MAP_WRITE_COMBINE: usize = 2;
 pub const MODE_TYPE: u16 = 0xF000;
 pub const MODE_DIR: u16 = 0x4000;
 pub const MODE_FILE: u16 = 0x8000;
+pub const MODE_SYMLINK: u16 = 0xA000;
 
 pub const MODE_PERM: u16 = 0x0FFF;
 pub const MODE_SETUID: u16 = 0o4000;
@@ -53,6 +54,7 @@ pub const O_TRUNC: usize =      0x0400_0000;
 pub const O_EXCL: usize =       0x0800_0000;
 pub const O_DIRECTORY: usize =  0x1000_0000;
 pub const O_STAT: usize =       0x2000_0000;
+pub const O_SYMLINK: usize =    0x4000_0000;
 pub const O_ACCMODE: usize =    O_RDONLY | O_WRONLY | O_RDWR;
 
 pub const SEEK_SET: usize = 0;

From 3456608aaed5db6ec3a520a295983e97c4f031fd Mon Sep 17 00:00:00 2001
From: Ian Douglas Scott <ian@iandouglasscott.com>
Date: Fri, 30 Jun 2017 13:37:05 -0700
Subject: [PATCH 2/2] Fix long line

---
 src/libstd/sys/redox/fs.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/libstd/sys/redox/fs.rs b/src/libstd/sys/redox/fs.rs
index 9a16fc1bf66a9..c5a19e8debe93 100644
--- a/src/libstd/sys/redox/fs.rs
+++ b/src/libstd/sys/redox/fs.rs
@@ -428,7 +428,8 @@ pub fn readlink(p: &Path) -> io::Result<PathBuf> {
 }
 
 pub fn symlink(src: &Path, dst: &Path) -> io::Result<()> {
-    let fd = cvt(syscall::open(dst.to_str().unwrap(), syscall::O_SYMLINK | syscall::O_CREAT | syscall::O_WRONLY | 0o777))?;
+    let fd = cvt(syscall::open(dst.to_str().unwrap(),
+                               syscall::O_SYMLINK | syscall::O_CREAT | syscall::O_WRONLY | 0o777))?;
     cvt(syscall::write(fd, src.to_str().unwrap().as_bytes()))?;
     cvt(syscall::close(fd))?;
     Ok(())