From: Jonas Bonn <jonas@southpole.se>
Subject: [RFC PATCH 16/38] Add dup3 syscall
Date: Tue,  6 Sep 2011 10:30:40 +0200

Signed-off-by: Jonas Bonn <jonas@southpole.se>
---
 include/unistd.h                 |    4 ++++
 libc/sysdeps/linux/common/dup3.c |   15 +++++++++++++++
 2 files changed, 19 insertions(+), 0 deletions(-)
 create mode 100644 libc/sysdeps/linux/common/dup3.c

diff --git a/include/unistd.h b/include/unistd.h
index 9568790..7c2fa4a 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -513,6 +513,10 @@ extern int dup (int __fd) __THROW __wur;
 extern int dup2 (int __fd, int __fd2) __THROW;
 libc_hidden_proto(dup2)
 
+/* Duplicate FD to FD2, closing FD2 and making it open on the same file.  */
+extern int dup3 (int __fd, int __fd2, int __flags) __THROW;
+libc_hidden_proto(dup3)
+
 /* NULL-terminated array of "NAME=VALUE" environment variables.  */
 extern char **__environ;
 #ifdef __USE_GNU
diff --git a/libc/sysdeps/linux/common/dup3.c b/libc/sysdeps/linux/common/dup3.c
new file mode 100644
index 0000000..5fdab2e
--- /dev/null
+++ b/libc/sysdeps/linux/common/dup3.c
@@ -0,0 +1,17 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * dup3() for uClibc
+ *
+ * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <sys/syscall.h>
+#include <unistd.h>
+
+
+#ifdef __NR_dup3
+_syscall3(int, dup3, int, oldfd, int, newfd, int, flags)
+libc_hidden_def(dup3)
+#endif
-- 
1.7.5.4

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