procfs_osrel.c

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 2009 Konstantin Belousov
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/proc.h>
#include <sys/sbuf.h>
#include <sys/uio.h>

#include <fs/pseudofs/pseudofs.h>
#include <fs/procfs/procfs.h>

int
procfs_doosrel(PFS_FILL_ARGS)
{
	const char *pp;
	int ov, osrel, i;

	if (uio == NULL)
		return (EOPNOTSUPP);
	switch (uio->uio_rw) {
	case UIO_READ:
		sbuf_printf(sb, "%d\n", p->p_osrel);
		break;
	case UIO_WRITE:
		sbuf_trim(sb);
		sbuf_finish(sb);
		pp = sbuf_data(sb);
		osrel = 0;
		i = sbuf_len(sb);
		while (i--) {
			if (*pp < '0' || *pp > '9')
				return (EINVAL);
			ov = osrel * 10 + *pp++ - '0';
			if (ov < osrel)
				return (EINVAL);
			osrel = ov;
		}
		p->p_osrel = osrel;
		break;
	}
	return (0);
}