1 files changed, 10 insertions, 0 deletions

diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c
index c496f9a22..1dcdbc065 100644
--- a/libbb/xfuncs.c
+++ b/libbb/xfuncs.c
@@ -133,6 +133,16 @@ int ndelay_off(int fd)
         return fcntl(fd,F_SETFL,fcntl(fd,F_GETFL,0) & ~O_NONBLOCK);
 }
 
+// "Renumber" opened fd
+void xmove_fd(int from, int to)
+{
+        if (from == to)
+                return;
+        if (dup2(from, to) != to)
+                bb_perror_msg_and_die("cannot duplicate file descriptor");
+        close(from);
+}
+
 // Die with an error message if we can't write the entire buffer.
 void xwrite(int fd, const void *buf, size_t count)
 {