Function fdisused

freebsd/kern/kern_descrip.c:242–250

}

static int
fdisused(struct filedesc *fdp, int fd)
{

	KASSERT(fd >= 0 && fd < fdp->fd_nfiles,
	    ("file descriptor %d out of range (0, %d)", fd, fdp->fd_nfiles));

	return ((fdp->fd_map[NDSLOT(fd)] & NDBIT(fd)) != 0);
}

/*
 * Mark a file descriptor as used.