kernel: sysctl: Add initial sysctl implementation

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 77 insertions, 0 deletions

diff --git a/sys/include/sys/sysctl.h b/sys/include/sys/sysctl.h
new file mode 100644
index 0000000..364d8e5
--- /dev/null
+++ b/sys/include/sys/sysctl.h
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * 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. Neither the name of Hyra 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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 _SYS_SYSCTL_H_
+#define _SYS_SYSCTL_H_
+
+#include <sys/types.h>
+#include <sys/param.h>
+
+#define KERN_OSTYPE         0
+#define KERN_OSRELEASE      1
+#define KERN_VERSION        2
+
+/*
+ * Option types (i.e., int, string, etc) for
+ * sysctl entries.
+ *
+ * TODO: Add SYSCTL_OPTYPE_NODE to define sysctl nodes in
+ *       the hierarchy.
+ */
+#define SYSCTL_OPTYPE_INT_RO   0
+#define SYSCTL_OPTYPE_STR_RO   1
+#define SYSCTL_OPTYPE_INT      2
+#define SYSCTL_OPTYPE_STR      3
+
+#if defined(_KERNEL)
+struct sysctl_entry {
+    int enttype;
+    int optype;
+    void *data;
+};
+#endif  /* _KERNEL */
+
+/*
+ * The sysctl entries use an MIB (Management Information Base) style
+ * naming scheme and follow a hierarchical naming structure. This is
+ * similar to the structure described in RFC 3418 for the Simple
+ * Network Management Protocol (SNMP).
+ */
+struct sysctl_args {
+    int *name;
+    int nlen;
+    void *oldp;
+    size_t *oldlenp;
+    void *newp;
+    size_t newlen;
+};
+
+int sysctl(struct sysctl_args *args);
+
+#endif  /* !_SYS_SYSCTL_H_ */