From 3ee4d23ebdd149e734ca33904a4786d5bd3fa8aa Mon Sep 17 00:00:00 2001
From: Andrew Kelley <superjoe30@gmail.com>
Date: Sat, 16 Jun 2018 19:54:16 -0400
Subject: [PATCH] posix read can return error.IsDir

---
 std/debug/index.zig |  1 +
 std/os/file.zig     | 11 +++++++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/std/debug/index.zig b/std/debug/index.zig
index 25f7a58b25..fb1dac537c 100644
--- a/std/debug/index.zig
+++ b/std/debug/index.zig
@@ -639,6 +639,7 @@ const ParseFormValueError = error{
     Unexpected,
     InvalidDebugInfo,
     EndOfFile,
+    IsDir,
     OutOfMemory,
 };
 
diff --git a/std/os/file.zig b/std/os/file.zig
index 41d3dfbf95..7e05501831 100644
--- a/std/os/file.zig
+++ b/std/os/file.zig
@@ -311,9 +311,15 @@ pub const File = struct {
         }
     }
 
-    pub const ReadError = error{};
+    pub const ReadError = error{
+        BadFd,
+        Io,
+        IsDir,
 
-    pub fn read(self: *File, buffer: []u8) !usize {
+        Unexpected,
+    };
+
+    pub fn read(self: *File, buffer: []u8) ReadError!usize {
         if (is_posix) {
             var index: usize = 0;
             while (index < buffer.len) {
@@ -326,6 +332,7 @@ pub const File = struct {
                         posix.EFAULT => unreachable,
                         posix.EBADF => return error.BadFd,
                         posix.EIO => return error.Io,
+                        posix.EISDIR => return error.IsDir,
                         else => return os.unexpectedErrorPosix(read_err),
                     }
                 }