DUP_CLOFORK
if (flags & DUP_CLOFORK)
if ((flags & DUP_CLOFORK) != 0)
error = kern_dup(DUP_VARIABLE | DUP_CLOFORK | DUP_FCNTL,
error = kern_dup(DUP_FIXED | DUP_CLOFORK, fd, newmin,
((nflags & FD_CLOFORK) != 0 ? DUP_CLOFORK : 0),