initial import of NetBSD tree

4 files changed, 1040 insertions, 0 deletions

diff --git a/sbin/sysctl/Makefile b/sbin/sysctl/Makefile
new file mode 100644
index 00000000000..39432099a2c
--- /dev/null
+++ b/sbin/sysctl/Makefile
@@ -0,0 +1,7 @@
+#	$NetBSD: Makefile,v 1.3 1995/09/30 07:12:43 thorpej Exp $
+#	@(#)Makefile	8.1 (Berkeley) 6/6/93
+
+PROG=	sysctl
+MAN=	sysctl.8
+
+.include <bsd.prog.mk>
diff --git a/sbin/sysctl/pathconf.c b/sbin/sysctl/pathconf.c
new file mode 100644
index 00000000000..ad51f0dfa75
--- /dev/null
+++ b/sbin/sysctl/pathconf.c
@@ -0,0 +1,235 @@
+/*	$NetBSD: pathconf.c,v 1.2 1995/09/30 07:12:47 thorpej Exp $	*/
+
+/*
+ * Copyright (c) 1993
+ *	The Regents of the University of California.  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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. 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.
+ */
+
+#ifndef lint
+static char copyright[] =
+"@(#) Copyright (c) 1993\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)pathconf.c	8.1 (Berkeley) 6/6/93";
+#else
+static char rcsid[] = "$NetBSD: pathconf.c,v 1.2 1995/09/30 07:12:47 thorpej Exp $";
+#endif
+#endif /* not lint */
+
+#include <sys/param.h>
+#include <sys/sysctl.h>
+#include <sys/unistd.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define PC_NAMES { \
+	{ 0, 0 }, \
+	{ "link_max", CTLTYPE_INT }, \
+	{ "max_canon", CTLTYPE_INT }, \
+	{ "max_input", CTLTYPE_INT }, \
+	{ "name_max", CTLTYPE_INT }, \
+	{ "path_max", CTLTYPE_INT }, \
+	{ "pipe_buf", CTLTYPE_INT }, \
+	{ "chown_restricted", CTLTYPE_INT }, \
+	{ "no_trunc", CTLTYPE_INT }, \
+	{ "vdisable", CTLTYPE_INT }, \
+}
+#define PC_MAXID 10
+
+struct ctlname pcnames[] = PC_NAMES;
+char names[BUFSIZ];
+
+struct list {
+	struct	ctlname *list;
+	int	size;
+};
+struct list pclist = { pcnames, PC_MAXID };
+
+int	Aflag, aflag, nflag, wflag, stdinflag;
+
+int
+main(argc, argv)
+	int argc;
+	char *argv[];
+{
+	extern char *optarg;
+	extern int optind;
+	char *path;
+	int ch;
+
+	while ((ch = getopt(argc, argv, "Aan")) != EOF) {
+		switch (ch) {
+
+		case 'A':
+			Aflag = 1;
+			break;
+
+		case 'a':
+			aflag = 1;
+			break;
+
+		case 'n':
+			nflag = 1;
+			break;
+
+		default:
+			usage();
+		}
+	}
+	argc -= optind;
+	argv += optind;
+
+	if (argc == 0)
+		usage();
+	path = *argv++;
+	if (strcmp(path, "-") == 0)
+		stdinflag = 1;
+	argc--;
+	if (Aflag || aflag) {
+		listall(path, &pclist);
+		exit(0);
+	}
+	if (argc == 0)
+		usage();
+	while (argc-- > 0)
+		parse(path, *argv, 1);
+	exit(0);
+}
+
+/*
+ * List all variables known to the system.
+ */
+listall(path, lp)
+	char *path;
+	struct list *lp;
+{
+	int lvl2;
+
+	if (lp->list == 0)
+		return;
+	for (lvl2 = 0; lvl2 < lp->size; lvl2++) {
+		if (lp->list[lvl2].ctl_name == 0)
+			continue;
+		parse(path, lp->list[lvl2].ctl_name, Aflag);
+	}
+}
+
+/*
+ * Parse a name into an index.
+ * Lookup and print out the attribute if it exists.
+ */
+parse(pathname, string, flags)
+	char *pathname;
+	char *string;
+	int flags;
+{
+	int indx, value;
+	char *bufp, buf[BUFSIZ];
+
+	bufp = buf;
+	snprintf(buf, BUFSIZ, "%s", string);
+	if ((indx = findname(string, "top", &bufp, &pclist)) == -1)
+		return;
+	if (bufp) {
+		fprintf(stderr, "name %s in %s is unknown\n", *bufp, string);
+		return;
+	}
+	if (stdinflag)
+		value = fpathconf(0, indx);
+	else
+		value = pathconf(pathname, indx);
+	if (value == -1) {
+		if (flags == 0)
+			return;
+		switch (errno) {
+		case EOPNOTSUPP:
+			fprintf(stderr, "%s: value is not available\n", string);
+			return;
+		case ENOTDIR:
+			fprintf(stderr, "%s: specification is incomplete\n",
+			    string);
+			return;
+		case ENOMEM:
+			fprintf(stderr, "%s: type is unknown to this program\n",
+			    string);
+			return;
+		default:
+			perror(string);
+			return;
+		}
+	}
+	if (!nflag)
+		fprintf(stdout, "%s = ", string);
+	fprintf(stdout, "%d\n", value);
+}
+
+/*
+ * Scan a list of names searching for a particular name.
+ */
+findname(string, level, bufp, namelist)
+	char *string;
+	char *level;
+	char **bufp;
+	struct list *namelist;
+{
+	char *name;
+	int i;
+
+	if (namelist->list == 0 || (name = strsep(bufp, ".")) == NULL) {
+		fprintf(stderr, "%s: incomplete specification\n", string);
+		return (-1);
+	}
+	for (i = 0; i < namelist->size; i++)
+		if (namelist->list[i].ctl_name != NULL &&
+		    strcmp(name, namelist->list[i].ctl_name) == 0)
+			break;
+	if (i == namelist->size) {
+		fprintf(stderr, "%s level name %s in %s is invalid\n",
+		    level, name, string);
+		return (-1);
+	}
+	return (i);
+}
+
+usage()
+{
+
+	(void)fprintf(stderr, "usage:\t%s\n\t%s\n\t%s\n",
+	    "pathname [-n] variable ...",
+	    "pathname [-n] -a", "pathname [-n] -A");
+	exit(1);
+}
diff --git a/sbin/sysctl/sysctl.8 b/sbin/sysctl/sysctl.8
new file mode 100644
index 00000000000..a67bd234a54
--- /dev/null
+++ b/sbin/sysctl/sysctl.8
@@ -0,0 +1,213 @@
+.\"	$NetBSD: sysctl.8,v 1.4 1995/09/30 07:12:49 thorpej Exp $
+.\"
+.\" Copyright (c) 1993
+.\"	The Regents of the University of California.  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. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. 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.
+.\"
+.\"	@(#)sysctl.8	8.1 (Berkeley) 6/6/93
+.\"
+.Dd "June 6, 1993"
+.Dt SYSCTL 8
+.Os
+.Sh NAME
+.Nm sysctl
+.Nd get or set kernel state
+.Sh SYNOPSIS
+.Nm sysctl
+.Op Fl n
+.Ar name ...
+.Nm sysctl
+.Op Fl n
+.Fl w
+.Ar name=value ...
+.Nm sysctl
+.Op Fl n
+.Fl aA
+.Sh DESCRIPTION
+The
+.Nm sysctl
+utility retrieves kernel state and allows processes with
+appropriate privilege to set kernel state.
+The state to be retrieved or set is described using a
+``Management Information Base'' (``MIB'') style name,
+described as a dotted set of components.
+The
+.Fl a
+flag can be used to list all the currently available string or integer values.
+The
+.Fl A
+flag will list all the known MIB names including tables.
+Those with string or integer values will be printed as with the
+.Fl a
+flag; for the table values,
+the name of the utility to retrieve them is given.
+.Pp
+The
+.Fl n
+flag specifies that the printing of the field name should be
+suppressed and that only its value should be output.
+This flag is useful for setting shell variables.
+For example, to save the pagesize in variable psize, use:
+.Bd -literal -offset indent -compact
+set psize=`sysctl -n hw.pagesize`
+.Ed
+.Pp
+If just a MIB style name is given,
+the corresponding value is retrieved.
+If a value is to be set, the
+.Fl w
+flag must be specified and the MIB name followed
+by an equal sign and the new value to be used.
+.Pp
+The information available from
+.Nm sysctl
+consists of integers, strings, and tables.
+The tabular information can only be retrieved by special
+purpose programs such as
+.Nm ps ,
+.Nm systat ,
+and
+.Nm netstat .
+The string and integer information is summaried below.
+For a detailed description of these variable see
+.Xr sysctl 3 .
+The changeable column indicates whether a process with appropriate
+privilege can change the value.
+.Bl -column net.inet.ip.forwardingxxxxxx integerxxx
+.It Sy Name	Type	Changeable
+.It kern.ostype	string	no
+.It kern.osrelease	string	no
+.It kern.osrevision	integer	no
+.It kern.version	string	no
+.It kern.maxvnodes	integer	yes
+.It kern.maxproc	integer	yes
+.It kern.maxfiles	integer	yes
+.It kern.maxpartitions	integer	no
+.It kern.rawpartition	integer	no
+.It kern.argmax	integer	no
+.It kern.securelevel	integer	raise only
+.It kern.hostname	string	yes
+.It kern.hostid	integer	yes
+.It kern.clockrate	struct	no
+.It kern.posix1version	integer	no
+.It kern.ngroups	integer	no
+.It kern.job_control	integer	no
+.It kern.saved_ids	integer	no
+.It kern.link_max	integer	no
+.It kern.max_canon	integer	no
+.It kern.max_input	integer	no
+.It kern.name_max	integer	no
+.It kern.path_max	integer	no
+.It kern.pipe_buf	integer	no
+.It kern.chown_restricted	integer	no
+.It kern.no_trunc	integer	no
+.It kern.vdisable	integer	no
+.It kern.boottime	struct	no
+.It vm.loadavg	struct	no
+.It machdep.console_device	dev_t	no
+.It net.inet.ip.forwarding	integer	yes
+.It net.inet.ip.redirect	integer	yes
+.It net.inet.ip.ttl	integer	yes
+.It net.inet.icmp.maskrepl	integer	yes
+.It net.inet.tcp.rfc1323	integer	yes
+.It net.inet.udp.checksum	integer	yes
+.It hw.machine	string	no
+.It hw.model	string	no
+.It hw.ncpu	integer	no
+.It hw.byteorder	integer	no
+.It hw.physmem	integer	no
+.It hw.usermem	integer	no
+.It hw.pagesize	integer	no
+.It user.cs_path	string	no
+.It user.bc_base_max	integer	no
+.It user.bc_dim_max	integer	no
+.It user.bc_scale_max	integer	no
+.It user.bc_string_max	integer	no
+.It user.coll_weights_max	integer	no
+.It user.expr_nest_max	integer	no
+.It user.line_max	integer	no
+.It user.re_dup_max	integer	no
+.It user.posix2_version	integer	no
+.It user.posix2_c_bind	integer	no
+.It user.posix2_c_dev	integer	no
+.It user.posix2_char_term	integer	no
+.It user.posix2_fort_dev	integer	no
+.It user.posix2_fort_run	integer	no
+.It user.posix2_localedef	integer	no
+.It user.posix2_sw_dev	integer	no
+.It user.posix2_upe	integer	no
+.El
+.Sh EXAMPLES
+.Pp
+For example, to retrieve the maximum number of processes allowed
+in the system, one would use the follow request:
+.Bd -literal -offset indent -compact
+sysctl kern.maxproc
+.Ed
+.Pp
+To set the maximum number of processes allowed
+in the system to 1000, one would use the follow request:
+.Bd -literal -offset indent -compact
+sysctl -w kern.maxproc=1000
+.Ed
+.Pp
+Information about the system clock rate may be obtained with:
+.Bd -literal -offset indent -compact
+sysctl kern.clockrate
+.Ed
+.Pp
+Information about the load average history may be obtained with
+.Bd -literal -offset indent -compact
+sysctl vm.loadavg
+.Ed
+.Sh FILES
+.Bl -tag -width <netinet/icmpXvar.h> -compact
+.It Pa <sys/sysctl.h>
+definitions for top level identifiers, second level kernel and hardware
+identifiers, and user level identifiers
+.It Pa <sys/socket.h>
+definitions for second level network identifiers
+.It Pa <sys/gmon.h>
+definitions for third level profiling identifiers
+.It Pa <vm/vm_param.h>
+definitions for second level virtual memory identifiers
+.It Pa <netinet/in.h>
+definitions for third level Internet identifiers and
+fourth level IP identifiers
+.It Pa <netinet/icmp_var.h>
+definitions for fourth level ICMP identifiers
+.It Pa <netinet/udp_var.h>
+definitions for fourth level UDP identifiers
+.El
+.Sh SEE ALSO
+.Xr sysctl 3
+.Sh HISTORY
+.Nm sysctl
+first appeared in 4.4BSD.
diff --git a/sbin/sysctl/sysctl.c b/sbin/sysctl/sysctl.c
new file mode 100644
index 00000000000..4f0f8ffaafa
--- /dev/null
+++ b/sbin/sysctl/sysctl.c
@@ -0,0 +1,585 @@
+/*	$NetBSD: sysctl.c,v 1.9 1995/09/30 07:12:50 thorpej Exp $	*/
+
+/*
+ * Copyright (c) 1993
+ *	The Regents of the University of California.  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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. 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.
+ */
+
+#ifndef lint
+static char copyright[] =
+"@(#) Copyright (c) 1993\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)sysctl.c	8.1 (Berkeley) 6/6/93";
+#else
+static char *rcsid = "$NetBSD: sysctl.c,v 1.9 1995/09/30 07:12:50 thorpej Exp $";
+#endif
+#endif /* not lint */
+
+#include <sys/param.h>
+#include <sys/gmon.h>
+#include <sys/stat.h>
+#include <sys/sysctl.h>
+#include <sys/socket.h>
+#include <vm/vm_param.h>
+#include <machine/cpu.h>
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/ip_icmp.h>
+#include <netinet/icmp_var.h>
+#include <netinet/ip_var.h>
+#include <netinet/udp.h>
+#include <netinet/udp_var.h>
+#include <netinet/tcp.h>
+#include <netinet/tcp_timer.h>
+#include <netinet/tcp_var.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+struct ctlname topname[] = CTL_NAMES;
+struct ctlname kernname[] = CTL_KERN_NAMES;
+struct ctlname vmname[] = CTL_VM_NAMES;
+struct ctlname netname[] = CTL_NET_NAMES;
+struct ctlname hwname[] = CTL_HW_NAMES;
+struct ctlname username[] = CTL_USER_NAMES;
+struct ctlname debugname[CTL_DEBUG_MAXID];
+#ifdef CTL_MACHDEP_NAMES
+struct ctlname machdepname[] = CTL_MACHDEP_NAMES;
+#endif
+char names[BUFSIZ];
+
+struct list {
+	struct	ctlname *list;
+	int	size;
+};
+struct list toplist = { topname, CTL_MAXID };
+struct list secondlevel[] = {
+	{ 0, 0 },			/* CTL_UNSPEC */
+	{ kernname, KERN_MAXID },	/* CTL_KERN */
+	{ vmname, VM_MAXID },		/* CTL_VM */
+	{ 0, 0 },			/* CTL_FS */
+	{ netname, NET_MAXID },		/* CTL_NET */
+	{ 0, CTL_DEBUG_MAXID },		/* CTL_DEBUG */
+	{ hwname, HW_MAXID },		/* CTL_HW */
+#ifdef CTL_MACHDEP_NAMES
+	{ machdepname, CPU_MAXID },	/* CTL_MACHDEP */
+#else
+	{ 0, 0 },			/* CTL_MACHDEP */
+#endif
+	{ username, USER_MAXID },	/* CTL_USER_NAMES */
+};
+
+int	Aflag, aflag, nflag, wflag;
+
+/*
+ * Variables requiring special processing.
+ */
+#define	CLOCK		0x00000001
+#define	BOOTTIME	0x00000002
+#define	CONSDEV		0x00000004
+
+int
+main(argc, argv)
+	int argc;
+	char *argv[];
+{
+	extern char *optarg;
+	extern int optind;
+	int ch, lvl1;
+
+	while ((ch = getopt(argc, argv, "Aanw")) != EOF) {
+		switch (ch) {
+
+		case 'A':
+			Aflag = 1;
+			break;
+
+		case 'a':
+			aflag = 1;
+			break;
+
+		case 'n':
+			nflag = 1;
+			break;
+
+		case 'w':
+			wflag = 1;
+			break;
+
+		default:
+			usage();
+		}
+	}
+	argc -= optind;
+	argv += optind;
+
+	if (Aflag || aflag) {
+		debuginit();
+		for (lvl1 = 1; lvl1 < CTL_MAXID; lvl1++)
+			listall(topname[lvl1].ctl_name, &secondlevel[lvl1]);
+		exit(0);
+	}
+	if (argc == 0)
+		usage();
+	while (argc-- > 0)
+		parse(*argv++, 1);
+	exit(0);
+}
+
+/*
+ * List all variables known to the system.
+ */
+listall(prefix, lp)
+	char *prefix;
+	struct list *lp;
+{
+	int lvl2;
+	char *cp, name[BUFSIZ];
+
+	if (lp->list == 0)
+		return;
+	strcpy(name, prefix);
+	cp = &name[strlen(name)];
+	*cp++ = '.';
+	for (lvl2 = 0; lvl2 < lp->size; lvl2++) {
+		if (lp->list[lvl2].ctl_name == 0)
+			continue;
+		strcpy(cp, lp->list[lvl2].ctl_name);
+		parse(name, Aflag);
+	}
+}
+
+/*
+ * Parse a name into a MIB entry.
+ * Lookup and print out the MIB entry if it exists.
+ * Set a new value if requested.
+ */
+parse(string, flags)
+	char *string;
+	int flags;
+{
+	int indx, type, state, len;
+	int special = 0;
+	void *newval = 0;
+	int intval, newsize = 0;
+	quad_t quadval;
+	size_t size;
+	struct list *lp;
+	int mib[CTL_MAXNAME];
+	char *cp, *bufp, buf[BUFSIZ], strval[BUFSIZ];
+
+	bufp = buf;
+	snprintf(buf, BUFSIZ, "%s", string);
+	if ((cp = strchr(string, '=')) != NULL) {
+		if (!wflag) {
+			fprintf(stderr, "Must specify -w to set variables\n");
+			exit(2);
+		}
+		*strchr(buf, '=') = '\0';
+		*cp++ = '\0';
+		while (isspace(*cp))
+			cp++;
+		newval = cp;
+		newsize = strlen(cp);
+	}
+	if ((indx = findname(string, "top", &bufp, &toplist)) == -1)
+		return;
+	mib[0] = indx;
+	if (indx == CTL_DEBUG)
+		debuginit();
+	lp = &secondlevel[indx];
+	if (lp->list == 0) {
+		fprintf(stderr, "%s: class is not implemented\n",
+		    topname[indx]);
+		return;
+	}
+	if (bufp == NULL) {
+		listall(topname[indx].ctl_name, lp);
+		return;
+	}
+	if ((indx = findname(string, "second", &bufp, lp)) == -1)
+		return;
+	mib[1] = indx;
+	type = lp->list[indx].ctl_type;
+	len = 2;
+	switch (mib[0]) {
+
+	case CTL_KERN:
+		switch (mib[1]) {
+		case KERN_PROF:
+			mib[2] = GPROF_STATE;
+			size = sizeof state;
+			if (sysctl(mib, 3, &state, &size, NULL, 0) < 0) {
+				if (flags == 0)
+					return;
+				if (!nflag)
+					fprintf(stdout, "%s: ", string);
+				fprintf(stderr,
+				    "kernel is not compiled for profiling\n");
+				return;
+			}
+			if (!nflag)
+				fprintf(stdout, "%s: %s\n", string,
+				    state == GMON_PROF_OFF ? "off" : "running");
+			return;
+		case KERN_VNODE:
+		case KERN_FILE:
+			if (flags == 0)
+				return;
+			fprintf(stderr,
+			    "Use pstat to view %s information\n", string);
+			return;
+		case KERN_PROC:
+			if (flags == 0)
+				return;
+			fprintf(stderr,
+			    "Use ps to view %s information\n", string);
+			return;
+		case KERN_CLOCKRATE:
+			special |= CLOCK;
+			break;
+		case KERN_BOOTTIME:
+			special |= BOOTTIME;
+			break;
+		}
+		break;
+
+	case CTL_HW:
+		break;
+
+	case CTL_VM:
+		if (mib[1] == VM_LOADAVG) {
+			double loads[3];
+
+			getloadavg(loads, 3);
+			if (!nflag)
+				fprintf(stdout, "%s: ", string);
+			fprintf(stdout, "%.2f %.2f %.2f\n", 
+			    loads[0], loads[1], loads[2]);
+			return;
+		}
+		if (flags == 0)
+			return;
+		fprintf(stderr,
+		    "Use vmstat or systat to view %s information\n", string);
+		return;
+
+	case CTL_NET:
+		if (mib[1] == PF_INET) {
+			len = sysctl_inet(string, &bufp, mib, flags, &type);
+			if (len >= 0)
+				break;
+			return;
+		}
+		if (flags == 0)
+			return;
+		fprintf(stderr, "Use netstat to view %s information\n", string);
+		return;
+
+	case CTL_DEBUG:
+		mib[2] = CTL_DEBUG_VALUE;
+		len = 3;
+		break;
+
+	case CTL_MACHDEP:
+#ifdef CPU_CONSDEV
+		if (mib[1] == CPU_CONSDEV)
+			special |= CONSDEV;
+#endif
+		break;
+
+	case CTL_FS:
+	case CTL_USER:
+		break;
+
+	default:
+		fprintf(stderr, "Illegal top level value: %d\n", mib[0]);
+		return;
+	
+	}
+	if (bufp) {
+		fprintf(stderr, "name %s in %s is unknown\n", bufp, string);
+		return;
+	}
+	if (newsize > 0) {
+		switch (type) {
+		case CTLTYPE_INT:
+			intval = atoi(newval);
+			newval = &intval;
+			newsize = sizeof intval;
+			break;
+
+		case CTLTYPE_QUAD:
+			sscanf(newval, "%qd", &quadval);
+			newval = &quadval;
+			newsize = sizeof quadval;
+			break;
+		}
+	}
+	size = BUFSIZ;
+	if (sysctl(mib, len, buf, &size, newsize ? newval : 0, newsize) == -1) {
+		if (flags == 0)
+			return;
+		switch (errno) {
+		case EOPNOTSUPP:
+			fprintf(stderr, "%s: value is not available\n", string);
+			return;
+		case ENOTDIR:
+			fprintf(stderr, "%s: specification is incomplete\n",
+			    string);
+			return;
+		case ENOMEM:
+			fprintf(stderr, "%s: type is unknown to this program\n",
+			    string);
+			return;
+		default:
+			perror(string);
+			return;
+		}
+	}
+	if (special & CLOCK) {
+		struct clockinfo *clkp = (struct clockinfo *)buf;
+
+		if (!nflag)
+			fprintf(stdout, "%s: ", string);
+		fprintf(stdout,
+		    "tick = %d, tickadj = %d, hz = %d, profhz = %d, stathz = %d\n",
+		    clkp->tick, clkp->tickadj, clkp->hz, clkp->profhz, clkp->stathz);
+		return;
+	}
+	if (special & BOOTTIME) {
+		struct timeval *btp = (struct timeval *)buf;
+		time_t boottime;
+
+		if (!nflag) {
+			boottime = btp->tv_sec;
+			fprintf(stdout, "%s = %s\n", string, ctime(&boottime));
+		} else
+			fprintf(stdout, "%d\n", btp->tv_sec);
+		return;
+	}
+	if (special & CONSDEV) {
+		dev_t dev = *(dev_t *)buf;
+
+		if (!nflag)
+			fprintf(stdout, "%s = %s\n", string,
+			    devname(dev, S_IFCHR));
+		else
+			fprintf(stdout, "0x%x\n", dev);
+		return;
+	}
+	switch (type) {
+	case CTLTYPE_INT:
+		if (newsize == 0) {
+			if (!nflag)
+				fprintf(stdout, "%s = ", string);
+			fprintf(stdout, "%d\n", *(int *)buf);
+		} else {
+			if (!nflag)
+				fprintf(stdout, "%s: %d -> ", string,
+				    *(int *)buf);
+			fprintf(stdout, "%d\n", *(int *)newval);
+		}
+		return;
+
+	case CTLTYPE_STRING:
+		if (newsize == 0) {
+			if (!nflag)
+				fprintf(stdout, "%s = ", string);
+			fprintf(stdout, "%s\n", buf);
+		} else {
+			if (!nflag)
+				fprintf(stdout, "%s: %s -> ", string, buf);
+			fprintf(stdout, "%s\n", newval);
+		}
+		return;
+
+	case CTLTYPE_QUAD:
+		if (newsize == 0) {
+			if (!nflag)
+				fprintf(stdout, "%s = ", string);
+			fprintf(stdout, "%qd\n", *(quad_t *)buf);
+		} else {
+			if (!nflag)
+				fprintf(stdout, "%s: %qd -> ", string,
+				    *(quad_t *)buf);
+			fprintf(stdout, "%qd\n", *(quad_t *)newval);
+		}
+		return;
+
+	case CTLTYPE_STRUCT:
+		fprintf(stderr, "%s: unknown structure returned\n",
+		    string);
+		return;
+
+	default:
+	case CTLTYPE_NODE:
+		fprintf(stderr, "%s: unknown type returned\n",
+		    string);
+		return;
+	}
+}
+
+/*
+ * Initialize the set of debugging names
+ */
+debuginit()
+{
+	int mib[3], loc, i;
+	size_t size;
+
+	if (secondlevel[CTL_DEBUG].list != 0)
+		return;
+	secondlevel[CTL_DEBUG].list = debugname;
+	mib[0] = CTL_DEBUG;
+	mib[2] = CTL_DEBUG_NAME;
+	for (loc = 0, i = 0; i < CTL_DEBUG_MAXID; i++) {
+		mib[1] = i;
+		size = BUFSIZ - loc;
+		if (sysctl(mib, 3, &names[loc], &size, NULL, 0) == -1)
+			continue;
+		debugname[i].ctl_name = &names[loc];
+		debugname[i].ctl_type = CTLTYPE_INT;
+		loc += size;
+	}
+}
+
+struct ctlname inetname[] = CTL_IPPROTO_NAMES;
+struct ctlname ipname[] = IPCTL_NAMES;
+struct ctlname icmpname[] = ICMPCTL_NAMES;
+struct ctlname tcpname[] = TCPCTL_NAMES;
+struct ctlname udpname[] = UDPCTL_NAMES;
+struct list inetlist = { inetname, IPPROTO_MAXID };
+struct list inetvars[] = {
+	{ ipname, IPCTL_MAXID },	/* ip */
+	{ icmpname, ICMPCTL_MAXID },	/* icmp */
+	{ 0, 0 },			/* igmp */
+	{ 0, 0 },			/* ggmp */
+	{ 0, 0 },
+	{ 0, 0 },
+	{ tcpname, TCPCTL_MAXID },	/* tcp */
+	{ 0, 0 },
+	{ 0, 0 },			/* egp */
+	{ 0, 0 },
+	{ 0, 0 },
+	{ 0, 0 },
+	{ 0, 0 },			/* pup */
+	{ 0, 0 },
+	{ 0, 0 },
+	{ 0, 0 },
+	{ 0, 0 },
+	{ udpname, UDPCTL_MAXID },	/* udp */
+};
+
+/*
+ * handle internet requests
+ */
+sysctl_inet(string, bufpp, mib, flags, typep)
+	char *string;
+	char **bufpp;
+	int mib[];
+	int flags;
+	int *typep;
+{
+	struct list *lp;
+	int indx;
+
+	if (*bufpp == NULL) {
+		listall(string, &inetlist);
+		return (-1);
+	}
+	if ((indx = findname(string, "third", bufpp, &inetlist)) == -1)
+		return (-1);
+	mib[2] = indx;
+	if (indx <= IPPROTO_UDP && inetvars[indx].list != NULL)
+		lp = &inetvars[indx];
+	else if (!flags)
+		return (-1);
+	else {
+		fprintf(stderr, "%s: no variables defined for this protocol\n",
+		    string);
+		return (-1);
+	}
+	if (*bufpp == NULL) {
+		listall(string, lp);
+		return (-1);
+	}
+	if ((indx = findname(string, "fourth", bufpp, lp)) == -1)
+		return (-1);
+	mib[3] = indx;
+	*typep = lp->list[indx].ctl_type;
+	return (4);
+}
+
+/*
+ * Scan a list of names searching for a particular name.
+ */
+findname(string, level, bufp, namelist)
+	char *string;
+	char *level;
+	char **bufp;
+	struct list *namelist;
+{
+	char *name;
+	int i;
+
+	if (namelist->list == 0 || (name = strsep(bufp, ".")) == NULL) {
+		fprintf(stderr, "%s: incomplete specification\n", string);
+		return (-1);
+	}
+	for (i = 0; i < namelist->size; i++)
+		if (namelist->list[i].ctl_name != NULL &&
+		    strcmp(name, namelist->list[i].ctl_name) == 0)
+			break;
+	if (i == namelist->size) {
+		fprintf(stderr, "%s level name %s in %s is invalid\n",
+		    level, name, string);
+		return (-1);
+	}
+	return (i);
+}
+
+usage()
+{
+
+	(void)fprintf(stderr, "usage:\t%s\n\t%s\n\t%s\n\t%s\n",
+	    "sysctl [-n] variable ...", "sysctl [-n] -w variable=value ...",
+	    "sysctl [-n] -a", "sysctl [-n] -A");
+	exit(1);
+}