f_dupfd           331 fs/fcntl.c     		err = f_dupfd(arg, filp, 0);
f_dupfd           334 fs/fcntl.c     		err = f_dupfd(arg, filp, O_CLOEXEC);
f_dupfd            82 include/linux/file.h extern int f_dupfd(unsigned int from, struct file *file, unsigned flags);