1 files changed, 36 insertions, 0 deletions
diff --git a/missing/dup2.c b/missing/dup2.c
new file mode 100644
index 0000000000..c541149d4b
--- /dev/null
+++ b/missing/dup2.c
@@ -0,0 +1,36 @@
+/* 
+ *    Copyright (c) 1991, Larry Wall
+ *
+ *    You may distribute under the terms of either the GNU General Public
+ *    License or the Artistic License, as specified in the README file.
+ */
+
+#include "defines.h"
+
+#if defined(HAVE_FCNTL) && defined(F_DUPFD)
+# include <fcntl.h>
+#endif
+
+int
+dup2(oldfd,newfd)
+int oldfd;
+int newfd;
+{
+#if defined(HAVE_FCNTL) && defined(F_DUPFD)
+    close(newfd);
+    return fcntl(oldfd, F_DUPFD, newfd);
+#else
+    int fdtmp[256];
+    int fdx = 0;
+    int fd;
+
+    if (oldfd == newfd)
+	return 0;
+    close(newfd);
+    while ((fd = dup(oldfd)) != newfd)	/* good enough for low fd's */
+	fdtmp[fdx++] = fd;
+    while (fdx > 0)
+	close(fdtmp[--fdx]);
+    return 0;
+#endif
+}