Index: head/sys/amd64/linux32/linux32_dummy.c
===================================================================
--- head/sys/amd64/linux32/linux32_dummy.c
+++ head/sys/amd64/linux32/linux32_dummy.c
@@ -122,7 +122,6 @@
 DUMMY(signalfd4);
 DUMMY(eventfd2);
 DUMMY(epoll_create1);
-DUMMY(dup3);
 DUMMY(inotify_init1);
 /* linux 2.6.30: */
 DUMMY(preadv);
Index: head/sys/amd64/linux32/syscalls.master
===================================================================
--- head/sys/amd64/linux32/syscalls.master
+++ head/sys/amd64/linux32/syscalls.master
@@ -539,7 +539,8 @@
 327	AUE_NULL	STD	{ int linux_signalfd4(void); }
 328	AUE_NULL	STD	{ int linux_eventfd2(void); }
 329	AUE_NULL	STD	{ int linux_epoll_create1(void); }
-330	AUE_NULL	STD	{ int linux_dup3(void); }
+330	AUE_NULL	STD	{ int linux_dup3(l_int oldfd,		\
+					l_int newfd, l_int flags); }
 331	AUE_NULL	STD	{ int linux_pipe2(l_int *pipefds, l_int flags); }
 332	AUE_NULL	STD	{ int linux_inotify_init1(void); }
 ; linux 2.6.30:
Index: head/sys/compat/linux/linux_file.c
===================================================================
--- head/sys/compat/linux/linux_file.c
+++ head/sys/compat/linux/linux_file.c
@@ -1608,3 +1608,22 @@
 	/* XXX: Close descriptors on error. */
 	return (copyout(fildes, args->pipefds, sizeof(fildes)));
 }
+
+int
+linux_dup3(struct thread *td, struct linux_dup3_args *args)
+{
+	int cmd;
+	intptr_t newfd;
+
+	if (args->oldfd == args->newfd)
+		return (EINVAL);
+	if ((args->flags & ~LINUX_O_CLOEXEC) != 0)
+		return (EINVAL);
+	if (args->flags & LINUX_O_CLOEXEC)
+		cmd = F_DUP2FD_CLOEXEC;
+	else
+		cmd = F_DUP2FD;
+
+	newfd = args->newfd;
+	return (kern_fcntl(td, args->oldfd, cmd, newfd));
+}
Index: head/sys/i386/linux/linux_dummy.c
===================================================================
--- head/sys/i386/linux/linux_dummy.c
+++ head/sys/i386/linux/linux_dummy.c
@@ -118,7 +118,6 @@
 DUMMY(signalfd4);
 DUMMY(eventfd2);
 DUMMY(epoll_create1);
-DUMMY(dup3);
 DUMMY(inotify_init1);
 /* linux 2.6.30: */
 DUMMY(preadv);
Index: head/sys/i386/linux/syscalls.master
===================================================================
--- head/sys/i386/linux/syscalls.master
+++ head/sys/i386/linux/syscalls.master
@@ -547,7 +547,8 @@
 327	AUE_NULL	STD	{ int linux_signalfd4(void); }
 328	AUE_NULL	STD	{ int linux_eventfd2(void); }
 329	AUE_NULL	STD	{ int linux_epoll_create1(void); }
-330	AUE_NULL	STD	{ int linux_dup3(void); }
+330	AUE_NULL	STD	{ int linux_dup3(l_int oldfd,		\
+					l_int newfd, l_int flags); }
 331	AUE_NULL	STD	{ int linux_pipe2(l_int *pipefds, l_int flags); }
 332	AUE_NULL	STD	{ int linux_inotify_init1(void); }
 ; linux 2.6.30: