From 2e748f2a763c37516476f31741fc6badd09c05d7 Mon Sep 17 00:00:00 2001
From: Theo de Raadt <deraadt@cvs.openbsd.org>
Date: Sun, 19 Apr 2009 00:57:45 +0000
Subject: A mini sysctl(8) that only knows a few variables we need to know in
 the install script.  For now, just hw.disknames

---
 distrib/special/sysctl/Makefile |  10 ++++
 distrib/special/sysctl/sysctl.c | 115 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 125 insertions(+)
 create mode 100644 distrib/special/sysctl/Makefile
 create mode 100644 distrib/special/sysctl/sysctl.c

diff --git a/distrib/special/sysctl/Makefile b/distrib/special/sysctl/Makefile
new file mode 100644
index 00000000000..7ae2abed16b
--- /dev/null
+++ b/distrib/special/sysctl/Makefile
@@ -0,0 +1,10 @@
+#	$OpenBSD: Makefile,v 1.1 2009/04/19 00:57:44 deraadt Exp $
+
+PROG=	sysctl
+SRCS=	sysctl.c
+CFLAGS+= -Os
+MAN=
+
+.PATH:	${.CURDIR}/../../../distrib/special/sysctl
+
+.include <bsd.prog.mk>
diff --git a/distrib/special/sysctl/sysctl.c b/distrib/special/sysctl/sysctl.c
new file mode 100644
index 00000000000..42c72e44203
--- /dev/null
+++ b/distrib/special/sysctl/sysctl.c
@@ -0,0 +1,115 @@
+/*	$OpenBSD: sysctl.c,v 1.1 2009/04/19 00:57:44 deraadt Exp $	*/
+
+/*
+ * Copyright (c) 2007 Kenneth R. Westerback <krw@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+#include <sys/param.h>
+#include <sys/sysctl.h>
+#include <sys/uio.h>
+
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+struct var {
+	char *name;
+	int (*print)(struct var *);
+	int nmib;
+	int mib[3];
+};
+
+int	pstring(struct var *);
+int	pint(struct var *);
+
+struct var vars[] = {
+	{ "hw.disknames", pstring, 2,
+	    { CTL_HW, HW_DISKNAMES }},
+};
+
+int	nflag;
+char	*name;
+
+int
+pint(struct var *v)
+{
+	int n;
+	size_t len = sizeof(n);
+
+	if (sysctl(v->mib, v->nmib, &n, &len, NULL, 0) != -1) {
+		if (nflag == 0)
+			printf("%s=", v->name);
+		printf("%d\n", n);
+		return (0);
+	}
+	return (1);
+}
+
+int
+pstring(struct var *v)
+{
+	struct iovec iov[2];
+	char *p;
+	size_t len;
+
+	if (sysctl(v->mib, v->nmib, NULL, &len, NULL, 0) != -1)
+		if ((p = malloc(len)) != NULL)
+			if (sysctl(v->mib, v->nmib, p, &len, NULL, 0) != -1) {
+				if (nflag == 0)
+					printf("%s=", v->name);
+				fwrite(p, len, 1, stdout);
+				printf("\n");
+				return (0);
+			}
+	return (1);
+}
+
+int
+main(int argc, char *argv[])
+{
+	int ch, i;
+
+	while ((ch = getopt(argc, argv, "n")) != -1) {
+		switch (ch) {
+		case 'n':
+			nflag = 1;
+			break;
+		default:
+			fprintf(stderr, "usage: sysctl [-n] name\n");
+			exit(1);
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	if (argc == 0) {
+		for (i = 0; i < sizeof(vars)/sizeof(vars[0]); i++)
+			(vars[i].print)(&vars[i]);
+		exit(0);
+	}
+
+	while (argc--) {
+		name = *argv++;
+
+		for (i = 0; i < sizeof(vars)/sizeof(vars[0]); i++) {
+			if (strcmp(name, vars[i].name) == 0) {
+				(vars[i].print)(&vars[i]);
+				break;
+			}
+		}
+	}
+
+	exit(0);
+}	
-- 
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