| kern_sysctl.c (217915) | kern_sysctl.c (217916) |
|---|---|
| 1/*- 2 * Copyright (c) 1982, 1986, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Mike Karels at Berkeley Software Design, Inc. 7 * 8 * Quite extensively rewritten by Poul-Henning Kamp of the FreeBSD --- 22 unchanged lines hidden (view full) --- 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94 36 */ 37 38#include <sys/cdefs.h> | 1/*- 2 * Copyright (c) 1982, 1986, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Mike Karels at Berkeley Software Design, Inc. 7 * 8 * Quite extensively rewritten by Poul-Henning Kamp of the FreeBSD --- 22 unchanged lines hidden (view full) --- 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94 36 */ 37 38#include <sys/cdefs.h> |
| 39__FBSDID("$FreeBSD: head/sys/kern/kern_sysctl.c 217915 2011-01-26 22:48:09Z mdf $"); | 39__FBSDID("$FreeBSD: head/sys/kern/kern_sysctl.c 217916 2011-01-27 00:34:12Z mdf $"); |
| 40 41#include "opt_compat.h" 42#include "opt_ktrace.h" 43 44#include <sys/param.h> 45#include <sys/fail.h> 46#include <sys/systm.h> 47#include <sys/kernel.h> --- 1538 unchanged lines hidden (view full) --- 1586 *retval = req.validlen; 1587 else 1588 *retval = req.oldidx; 1589 } 1590 return (error); 1591} 1592 1593/* | 40 41#include "opt_compat.h" 42#include "opt_ktrace.h" 43 44#include <sys/param.h> 45#include <sys/fail.h> 46#include <sys/systm.h> 47#include <sys/kernel.h> --- 1538 unchanged lines hidden (view full) --- 1586 *retval = req.validlen; 1587 else 1588 *retval = req.oldidx; 1589 } 1590 return (error); 1591} 1592 1593/* |
| 1594 * Drain into a sysctl struct. The user buffer must be wired. | 1594 * Drain into a sysctl struct. The user buffer should be wired if a page 1595 * fault would cause issue. |
| 1595 */ 1596static int 1597sbuf_sysctl_drain(void *arg, const char *data, int len) 1598{ 1599 struct sysctl_req *req = arg; 1600 int error; 1601 1602 error = SYSCTL_OUT(req, data, len); 1603 KASSERT(error >= 0, ("Got unexpected negative value %d", error)); 1604 return (error == 0 ? len : -error); 1605} 1606 1607struct sbuf * 1608sbuf_new_for_sysctl(struct sbuf *s, char *buf, int length, 1609 struct sysctl_req *req) 1610{ 1611 | 1596 */ 1597static int 1598sbuf_sysctl_drain(void *arg, const char *data, int len) 1599{ 1600 struct sysctl_req *req = arg; 1601 int error; 1602 1603 error = SYSCTL_OUT(req, data, len); 1604 KASSERT(error >= 0, ("Got unexpected negative value %d", error)); 1605 return (error == 0 ? len : -error); 1606} 1607 1608struct sbuf * 1609sbuf_new_for_sysctl(struct sbuf *s, char *buf, int length, 1610 struct sysctl_req *req) 1611{ 1612 |
| 1612 /* Wire the user buffer, so we can write without blocking. */ 1613 sysctl_wire_old_buffer(req, 0); 1614 | |
| 1615 s = sbuf_new(s, buf, length, SBUF_FIXEDLEN); 1616 sbuf_set_drain(s, sbuf_sysctl_drain, req); 1617 return (s); 1618} | 1613 s = sbuf_new(s, buf, length, SBUF_FIXEDLEN); 1614 sbuf_set_drain(s, sbuf_sysctl_drain, req); 1615 return (s); 1616} |