From 68c02fc95af57a0b3be64aa214125be2d3ed1cf7 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Tue, 3 Aug 2010 18:03:55 +0200
Subject: fd_util: add function dup_cloexec()

Unfortunately, there's no "optimized" implementation here.  We can't
use Linux's proprietary system call dup3(), because it would require
us to specify the new descriptor.
---
 src/fd_util.c | 10 ++++++++++
 src/fd_util.h |  7 +++++++
 2 files changed, 17 insertions(+)

(limited to 'src')

diff --git a/src/fd_util.c b/src/fd_util.c
index b9443b03d..769823bc4 100644
--- a/src/fd_util.c
+++ b/src/fd_util.c
@@ -103,6 +103,16 @@ fd_set_nonblock(int fd)
 #endif
 }
 
+int
+dup_cloexec(int oldfd)
+{
+	int newfd = dup(oldfd);
+	if (newfd >= 0)
+		fd_set_nonblock(newfd);
+
+	return newfd;
+}
+
 int
 open_cloexec(const char *path_fs, int flags, int mode)
 {
diff --git a/src/fd_util.h b/src/fd_util.h
index 80fb98703..5b80df2c7 100644
--- a/src/fd_util.h
+++ b/src/fd_util.h
@@ -49,6 +49,13 @@
 
 struct sockaddr;
 
+/**
+ * Wrapper for dup(), which sets the CLOEXEC flag on the new
+ * descriptor.
+ */
+int
+dup_cloexec(int oldfd);
+
 /**
  * Wrapper for open(), which sets the CLOEXEC flag (atomically if
  * supported by the OS).
-- 
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