Function kern_close_range

freebsd/kern/kern_descrip.c:1369–1418

}

int
kern_close_range(struct thread *td, u_int lowfd, u_int highfd)
{
	struct filedesc *fdp;
	const struct fdescenttbl *fdt;
	struct file *fp;
	int fd;

	/*
	 * Check this prior to clamping; closefrom(3) with only fd 0, 1, and 2
	 * open should not be a usage error.  From a close_range() perspective,
	 * close_range(3, ~0U, 0) in the same scenario should also likely not
	 * be a usage error as all fd above 3 are in-fact already closed.
	 */
	if (highfd < lowfd) {
		return (EINVAL);
	}

	fdp = td->td_proc->p_fd;
	FILEDESC_XLOCK(fdp);
	#pragma GCC diagnostic ignored "-Wcast-qual"
	fdt = atomic_load_ptr(&fdp->fd_files);
	#pragma GCC diagnostic error "-Wcast-qual"
	highfd = MIN(highfd, fdt->fdt_nfiles - 1);
	fd = lowfd;
	if (__predict_false(fd > highfd)) {
		goto out_locked;
	}
	for (;;) {
		fp = fdt->fdt_ofiles[fd].fde_file;
		if (fp == NULL) {
			if (fd == highfd)
				goto out_locked;
		} else {
			fdfree(fdp, fd);
			(void) closefp(fdp, fd, fp, td, true, true);
			if (fd == highfd)
				goto out_unlocked;
			FILEDESC_XLOCK(fdp);
			#pragma GCC diagnostic ignored "-Wcast-qual"
			fdt = atomic_load_ptr(&fdp->fd_files);
			#pragma GCC diagnostic error "-Wcast-qual"
		}
		fd++;
	}
out_locked:
	FILEDESC_XUNLOCK(fdp);
out_unlocked:
	return (0);
}

#ifndef _SYS_SYSPROTO_H_
struct close_range_args {