From d0f5817f4720b49ffaee9fa9593b2f11446963a0 Mon Sep 17 00:00:00 2001
From: Benjamin Barenblat <bbaren@mit.edu>
Date: Thu, 18 Feb 2016 21:39:06 -0500
Subject: Add nullary constructor to IoError

The constructor constructs an IoError based on the current errno.
---
 src/posix_extras.cc | 6 +++---
 src/posix_extras.h  | 3 +++
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/posix_extras.cc b/src/posix_extras.cc
index d06dc41..c3c841c 100644
--- a/src/posix_extras.cc
+++ b/src/posix_extras.cc
@@ -50,7 +50,7 @@ std::string IoError::Message(const int number) noexcept {
 
 File::File(const char* const path, const int flags) : path_(path) {
   if ((fd_ = open(path, flags)) == -1) {
-    throw IoError(errno);
+    throw IoError();
   }
 }
 
@@ -65,7 +65,7 @@ File::~File() noexcept {
 struct stat File::Stat() const {
   struct stat result;
   if (fstat(fd_, &result) == -1) {
-    throw IoError(errno);
+    throw IoError();
   }
   return result;
 }
@@ -77,7 +77,7 @@ struct stat File::LinkStatAt(const char* const path) const {
 
   struct stat result;
   if (fstatat(fd_, path, &result, AT_SYMLINK_NOFOLLOW) == -1) {
-    throw IoError(errno);
+    throw IoError();
   }
   return result;
 }
diff --git a/src/posix_extras.h b/src/posix_extras.h
index b9c0f12..001968f 100644
--- a/src/posix_extras.h
+++ b/src/posix_extras.h
@@ -15,6 +15,7 @@
 #ifndef POSIX_EXTRAS_H_
 #define POSIX_EXTRAS_H_
 
+#include <cerrno>
 #include <stdexcept>
 #include <string>
 
@@ -26,6 +27,8 @@ namespace scoville {
 
 class IoError : public std::runtime_error {
  public:
+  IoError() : IoError(errno) {}
+
   explicit IoError(const int number)
       : std::runtime_error(Message(number)), number_(number) {}
 
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