diff --git a/coregrind/m_syswrap/syswrap-freebsd.c b/coregrind/m_syswrap/syswrap-freebsd.c
--- a/coregrind/m_syswrap/syswrap-freebsd.c
+++ b/coregrind/m_syswrap/syswrap-freebsd.c
@@ -3278,9 +3278,12 @@ PRE(sys_fcntl)
 
    // These ones use ARG3 as "arg".
    case VKI_F_DUPFD:
+   case VKI_F_DUPFD_CLOEXEC:
    case VKI_F_SETFD:
    case VKI_F_SETFL:
    case VKI_F_SETOWN:
+   case VKI_F_READAHEAD:
+   case VKI_F_RDAHEAD:
       PRINT("sys_fcntl[ARG3=='arg'] ( %ld, %ld, %ld )", ARG1,ARG2,ARG3);
       PRE_REG_READ3(long, "fcntl",
                     unsigned int, fd, unsigned int, cmd, unsigned long, arg);
@@ -3300,6 +3303,7 @@ PRE(sys_fcntl)
 
    // This one uses ARG3 as "oldd" and ARG4 as "newd".
    case VKI_F_DUP2FD:
+   case VKI_F_DUP2FD_CLOEXEC:
       PRINT("sys_fcntl[ARG3=='oldd', ARG4=='newd'] ( %ld, %ld, %ld, %ld )",
          ARG1,ARG2,ARG3,ARG4);
       PRE_REG_READ4(long, "fcntl",
@@ -3339,6 +3343,15 @@ POST(sys_fcntl)
             ML_(record_fd_open_named)(tid, RES);
       }
    }
+   else if (ARG2 == VKI_F_DUPFD_CLOEXEC) {
+      if (!ML_(fd_allowed)(RES, "fcntl(DUPFD_CLOEXEC)", tid, True)) {
+         VG_(close)(RES);
+         SET_STATUS_Failure( VKI_EMFILE );
+      } else {
+         if (VG_(clo_track_fds))
+            ML_(record_fd_open_named)(tid, RES);
+      }
+   }
 }
 
 PRE(sys_ioctl)
diff --git a/include/vki/vki-freebsd.h b/include/vki/vki-freebsd.h
--- a/include/vki/vki-freebsd.h
+++ b/include/vki/vki-freebsd.h
@@ -1554,6 +1554,10 @@ struct vki_dirent {
 #define VKI_F_SETLK		12	/* set record locking information */
 #define VKI_F_SETLKW		13	/* F_SETLK; wait if blocked */
 #define VKI_F_SETLK_REMOTE	14	/* debugging support for remote locks */
+#define VKI_F_READAHEAD		15	/* read ahead */
+#define VKI_F_RDAHEAD		16	/* Darwin compatible read ahead */
+#define VKI_F_DUPFD_CLOEXEC	17	/* Like F_DUPFD, but FD_CLOEXEC is set */
+#define VKI_F_DUP2FD_CLOEXEC	18	/* Like F_DUP2FD, but FD_CLOEXEC is set */
 
 /* for F_[GET|SET]FL */
 #define VKI_FD_CLOEXEC	1	/* actually anything with low bit set goes */