sysctlbyname allows acces to sysctl variables by name.

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Reviewed by:	peter

1 files changed, 33 insertions, 0 deletions

diff --git a/lib/libc/gen/sysctlbyname.c b/lib/libc/gen/sysctlbyname.c
new file mode 100644
index 0000000..a3133af
--- /dev/null
+++ b/lib/libc/gen/sysctlbyname.c
@@ -0,0 +1,33 @@
+/*
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <phk@FreeBSD.org> wrote this file.  As long as you retain this notice you
+ * can do whatever you want with this stuff. If we meet some day, and you think
+ * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
+ * ----------------------------------------------------------------------------
+ *
+ * $Id$
+ *
+ */
+#include <sys/types.h>
+#include <sys/sysctl.h>
+
+int
+sysctlbyname(char *name, void *oldp, size_t *oldlenp, void *newp, size_t newlen)
+{
+	int name2oid_oid[2];
+	int real_oid[CTL_MAXNAME+2];
+	int error, oidlen;
+
+	name2oid_oid[0] = 0;	/* This is magic & undocumented! */
+	name2oid_oid[1] = 3;
+
+	oidlen = sizeof(real_oid);
+	error = sysctl(name2oid_oid, 2, real_oid, &oidlen, name, strlen(name));
+	if (error < 0) 
+		return error;
+	oidlen /= sizeof (int);
+	error = sysctl(real_oid, oidlen, oldp, oldlenp, newp, newlen);
+	return (error);
+}
+