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-rw-r--r--lib/libc/gen/sysctlbyname.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/lib/libc/gen/sysctlbyname.c b/lib/libc/gen/sysctlbyname.c
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+++ b/lib/libc/gen/sysctlbyname.c
@@ -0,0 +1,54 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright 2019 Pawel Biernacki, Mysterious Code Ltd.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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/sysctl.h>
+#include <string.h>
+
+extern int __sysctlbyname(const char *name, size_t namelen, void *oldp,
+ size_t *oldlenp, const void *newp, size_t newlen);
+
+int
+sysctlbyname(const char *name, void *oldp, size_t *oldlenp,
+ const void *newp, size_t newlen)
+{
+ size_t len;
+ int oid[2];
+
+ if (__predict_true(strncmp(name, "user.", 5) != 0)) {
+ len = strlen(name);
+ return (__sysctlbyname(name, len, oldp, oldlenp, newp,
+ newlen));
+ } else {
+ len = nitems(oid);
+ if (sysctlnametomib(name, oid, &len) == -1)
+ return (-1);
+ return (sysctl(oid, (u_int)len, oldp, oldlenp, newp,
+ newlen));
+ }
+}