1 files changed, 37 insertions, 0 deletions
diff --git a/lib/libc_r/uthread/uthread_dup.c b/lib/libc_r/uthread/uthread_dup.c
new file mode 100644
index 000000000000..e6c459835be7
--- /dev/null
+++ b/lib/libc_r/uthread/uthread_dup.c
@@ -0,0 +1,37 @@
+#include <unistd.h>
+#ifdef _THREAD_SAFE
+#include <pthread.h>
+#include "pthread_private.h"
+
+int
+dup(int fd)
+{
+	int             ret;
+
+	/* Lock the file descriptor: */
+	if ((ret = _thread_fd_lock(fd, FD_RDWR, NULL, __FILE__, __LINE__)) == 0) {
+		/* Perform the 'dup' syscall: */
+		if ((ret = _thread_sys_dup(fd)) < 0) {
+		}
+		/* Initialise the file descriptor table entry: */
+		else if (_thread_fd_table_init(ret) != 0) {
+			/* Quietly close the file: */
+			_thread_sys_close(ret);
+
+			/* Reset the file descriptor: */
+			ret = -1;
+		} else {
+			/*
+			 * Save the file open flags so that they can be
+			 * checked later: 
+			 */
+			_thread_fd_table[ret]->flags = _thread_fd_table[fd]->flags;
+		}
+
+		/* Unlock the file descriptor: */
+		_thread_fd_unlock(fd, FD_RDWR);
+	}
+	/* Return the completion status: */
+	return (ret);
+}
+#endif