From 2940072ad2e4a074da9b091fce89adc50e29c6e0 Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Tue, 8 Nov 2016 16:09:37 +0300
Subject: Add fddup()

---
 butl/fdstream | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

(limited to 'butl/fdstream')

diff --git a/butl/fdstream b/butl/fdstream
index 289d925..d3dbef7 100644
--- a/butl/fdstream
+++ b/butl/fdstream
@@ -52,8 +52,9 @@ namespace butl
     void
     reset (int fd = -1) noexcept;
 
-    // Close an open file descriptor. Throw ios::failure on failure. The object
-    // become unopened whenever the exception is thrown or not.
+    // Close an open file descriptor. Throw ios::failure on the underlying OS
+    // error. Reset the descriptor to -1 whenever the exception is thrown or
+    // not.
     //
     void
     close ();
@@ -498,6 +499,12 @@ namespace butl
                         permissions::rg | permissions::wg |
                         permissions::ro | permissions::wo);
 
+  // Duplicate an open file descriptor. Throw ios::failure on the underlying
+  // OS error.
+  //
+  LIBBUTL_EXPORT auto_fd
+  fddup (int fd);
+
   // Set the translation mode for the file descriptor. Return the previous
   // mode on success, throw ios::failure otherwise.
   //
-- 
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