Handle ENOENT

Translate ENOENT to IoErrorKind::FileNotFound.

src/librustuv/lib.rs

@@ -337,6 +337,7 @@ pub fn uv_error_to_io_error(uverr: UvError) -> IoError {
             EACCES => PermissionDenied,
             ECONNREFUSED => ConnectionRefused,
             ECONNRESET => ConnectionReset,
+            ENOENT => FileNotFound,
             ENOTCONN => NotConnected,
             EPIPE => BrokenPipe,
             ECONNABORTED => ConnectionAborted,

src/librustuv/uvll.rs

@@ -44,6 +44,7 @@ pub static EOF: c_int = -4095;
 pub static UNKNOWN: c_int = -4094;
 
 // uv-errno.h redefines error codes for windows, but not for unix...
+// https://github.com/joyent/libuv/blob/master/include/uv-errno.h
 
 #[cfg(windows)]
 pub mod errors {
@@ -52,6 +53,7 @@ pub mod errors {
     pub static EACCES: c_int = -4092;
     pub static ECONNREFUSED: c_int = -4078;
     pub static ECONNRESET: c_int = -4077;
+    pub static ENOENT: c_int = -4058;
     pub static ENOTCONN: c_int = -4053;
     pub static EPIPE: c_int = -4047;
     pub static ECONNABORTED: c_int = -4079;
@@ -66,6 +68,7 @@ pub mod errors {
     pub static EACCES: c_int = -libc::EACCES;
     pub static ECONNREFUSED: c_int = -libc::ECONNREFUSED;
     pub static ECONNRESET: c_int = -libc::ECONNRESET;
+    pub static ENOENT: c_int = -libc::ENOENT;
     pub static ENOTCONN: c_int = -libc::ENOTCONN;
     pub static EPIPE: c_int = -libc::EPIPE;
     pub static ECONNABORTED: c_int = -libc::ECONNABORTED;

src/libstd/io/net/unix.rs

@@ -194,7 +194,7 @@ mod tests {
         do run_in_mt_newsched_task {
             let mut called = false;
             io_error::cond.trap(|e| {
-                assert_eq!(e.kind, OtherIoError);
+                assert_eq!(e.kind, FileNotFound);
                 called = true;
             }).inside(|| {
                 let stream = UnixStream::connect(&("path/to/nowhere"));

src/libstd/run.rs

@@ -340,7 +340,7 @@ mod tests {
     use task::spawn;
     use unstable::running_on_valgrind;
     use io::native::file;
-    use io::{Writer, Reader, io_error};
+    use io::{FileNotFound, OtherIoError, Reader, Writer, io_error};
 
     #[test]
     #[cfg(not(target_os="android"))] // FIXME(#10380)
@@ -354,9 +354,14 @@ mod tests {
 
     #[test]
     fn test_process_output_fail_to_start() {
+        // If the executable does not exist, then the io_error condition should be raised with
+        // IoErrorKind FileNotFound.
+
         let mut trapped_io_error = false;
-        let opt_outp = io_error::cond.trap(|_| {
+        let opt_outp = io_error::cond.trap(|e| {
             trapped_io_error = true;
+            // FIXME(#11023)
+            assert_eq!(e.kind, if cfg!(windows) { OtherIoError } else { FileNotFound });
         }).inside(|| -> Option<run::ProcessOutput> {
             run::process_output("no-binary-by-this-name-should-exist", [])
         });