Add netstat command

This adds the netstat command. All but one file is currently enabled.
That file does not currently build.

Also added libmemstat and libutil. libmemstat had a lot of code related
to kvm and kernel memory access disabled. This may or may not be an
issue.

freebsd-userspace/lib/libmemstat/memstat.c

@@ -0,0 +1,421 @@
+/*-
+ * Copyright (c) 2005 Robert N. M. Watson
+ * 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.
+ *
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/sysctl.h>
+
+#include <err.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "memstat.h"
+#include "memstat_internal.h"
+
+const char *
+memstat_strerror(int error)
+{
+
+	switch (error) {
+	case MEMSTAT_ERROR_NOMEMORY:
+		return ("Cannot allocate memory");
+	case MEMSTAT_ERROR_VERSION:
+		return ("Version mismatch");
+	case MEMSTAT_ERROR_PERMISSION:
+		return ("Permission denied");
+	case MEMSTAT_ERROR_TOOMANYCPUS:
+		return ("Too many CPUs");
+	case MEMSTAT_ERROR_DATAERROR:
+		return ("Data format error");
+	case MEMSTAT_ERROR_KVM:
+		return ("KVM error");
+	case MEMSTAT_ERROR_KVM_NOSYMBOL:
+		return ("KVM unable to find symbol");
+	case MEMSTAT_ERROR_KVM_SHORTREAD:
+		return ("KVM short read");
+	case MEMSTAT_ERROR_UNDEFINED:
+	default:
+		return ("Unknown error");
+	}
+}
+
+struct memory_type_list *
+memstat_mtl_alloc(void)
+{
+	struct memory_type_list *mtlp;
+
+	mtlp = malloc(sizeof(*mtlp));
+	if (mtlp == NULL)
+		return (NULL);
+
+	LIST_INIT(&mtlp->mtl_list);
+	mtlp->mtl_error = MEMSTAT_ERROR_UNDEFINED;
+	return (mtlp);
+}
+
+struct memory_type *
+memstat_mtl_first(struct memory_type_list *list)
+{
+
+	return (LIST_FIRST(&list->mtl_list));
+}
+
+struct memory_type *
+memstat_mtl_next(struct memory_type *mtp)
+{
+
+	return (LIST_NEXT(mtp, mt_list));
+}
+
+void
+_memstat_mtl_empty(struct memory_type_list *list)
+{
+	struct memory_type *mtp;
+
+	while ((mtp = LIST_FIRST(&list->mtl_list))) {
+		LIST_REMOVE(mtp, mt_list);
+		free(mtp);
+	}
+}
+
+void
+memstat_mtl_free(struct memory_type_list *list)
+{
+
+	_memstat_mtl_empty(list);
+	free(list);
+}
+
+int
+memstat_mtl_geterror(struct memory_type_list *list)
+{
+
+	return (list->mtl_error);
+}
+
+/*
+ * Look for an existing memory_type entry in a memory_type list, based on the
+ * allocator and name of the type.  If not found, return NULL.  No errno or
+ * memstat error.
+ */
+struct memory_type *
+memstat_mtl_find(struct memory_type_list *list, int allocator,
+    const char *name)
+{
+	struct memory_type *mtp;
+
+	LIST_FOREACH(mtp, &list->mtl_list, mt_list) {
+		if ((mtp->mt_allocator == allocator ||
+		    allocator == ALLOCATOR_ANY) &&
+		    strcmp(mtp->mt_name, name) == 0)
+			return (mtp);
+	}
+	return (NULL);
+}
+
+/*
+ * Allocate a new memory_type with the specificed allocator type and name,
+ * then insert into the list.  The structure will be zero'd.
+ *
+ * libmemstat(3) internal function.
+ */
+struct memory_type *
+_memstat_mt_allocate(struct memory_type_list *list, int allocator,
+    const char *name)
+{
+	struct memory_type *mtp;
+
+	mtp = malloc(sizeof(*mtp));
+	if (mtp == NULL)
+		return (NULL);
+
+	bzero(mtp, sizeof(*mtp));
+
+	mtp->mt_allocator = allocator;
+	strlcpy(mtp->mt_name, name, MEMTYPE_MAXNAME);
+	LIST_INSERT_HEAD(&list->mtl_list, mtp, mt_list);
+	return (mtp);
+}
+
+/*
+ * Reset any libmemstat(3)-owned statistics in a memory_type record so that
+ * it can be reused without incremental addition problems.  Caller-owned
+ * memory is left "as-is", and must be updated by the caller if desired.
+ *
+ * libmemstat(3) internal function.
+ */
+void
+_memstat_mt_reset_stats(struct memory_type *mtp)
+{
+	int i;
+
+	mtp->mt_countlimit = 0;
+	mtp->mt_byteslimit = 0;
+	mtp->mt_sizemask = 0;
+	mtp->mt_size = 0;
+
+	mtp->mt_memalloced = 0;
+	mtp->mt_memfreed = 0;
+	mtp->mt_numallocs = 0;
+	mtp->mt_numfrees = 0;
+	mtp->mt_bytes = 0;
+	mtp->mt_count = 0;
+	mtp->mt_free = 0;
+	mtp->mt_failures = 0;
+
+	mtp->mt_zonefree = 0;
+	mtp->mt_kegfree = 0;
+
+	for (i = 0; i < MEMSTAT_MAXCPU; i++) {
+		mtp->mt_percpu_alloc[i].mtp_memalloced = 0;
+		mtp->mt_percpu_alloc[i].mtp_memfreed = 0;
+		mtp->mt_percpu_alloc[i].mtp_numallocs = 0;
+		mtp->mt_percpu_alloc[i].mtp_numfrees = 0;
+		mtp->mt_percpu_alloc[i].mtp_sizemask = 0;
+		mtp->mt_percpu_cache[i].mtp_free = 0;
+	}
+}
+
+/*
+ * Accessor methods for struct memory_type.  Avoids encoding the structure
+ * ABI into the application.
+ */
+const char *
+memstat_get_name(const struct memory_type *mtp)
+{
+
+	return (mtp->mt_name);
+}
+
+int
+memstat_get_allocator(const struct memory_type *mtp)
+{
+
+	return (mtp->mt_allocator);
+}
+
+uint64_t
+memstat_get_countlimit(const struct memory_type *mtp)
+{
+
+	return (mtp->mt_countlimit);
+}
+
+uint64_t
+memstat_get_byteslimit(const struct memory_type *mtp)
+{
+
+	return (mtp->mt_byteslimit);
+}
+
+uint64_t
+memstat_get_sizemask(const struct memory_type *mtp)
+{
+
+	return (mtp->mt_sizemask);
+}
+
+uint64_t
+memstat_get_size(const struct memory_type *mtp)
+{
+
+	return (mtp->mt_size);
+}
+
+uint64_t
+memstat_get_memalloced(const struct memory_type *mtp)
+{
+
+	return (mtp->mt_memalloced);
+}
+
+uint64_t
+memstat_get_memfreed(const struct memory_type *mtp)
+{
+
+	return (mtp->mt_memfreed);
+}
+
+uint64_t
+memstat_get_numallocs(const struct memory_type *mtp)
+{
+
+	return (mtp->mt_numallocs);
+}
+
+uint64_t
+memstat_get_numfrees(const struct memory_type *mtp)
+{
+
+	return (mtp->mt_numfrees);
+}
+
+uint64_t
+memstat_get_bytes(const struct memory_type *mtp)
+{
+
+	return (mtp->mt_bytes);
+}
+
+uint64_t
+memstat_get_count(const struct memory_type *mtp)
+{
+
+	return (mtp->mt_count);
+}
+
+uint64_t
+memstat_get_free(const struct memory_type *mtp)
+{
+
+	return (mtp->mt_free);
+}
+
+uint64_t
+memstat_get_failures(const struct memory_type *mtp)
+{
+
+	return (mtp->mt_failures);
+}
+
+void *
+memstat_get_caller_pointer(const struct memory_type *mtp, int index)
+{
+
+	return (mtp->mt_caller_pointer[index]);
+}
+
+void
+memstat_set_caller_pointer(struct memory_type *mtp, int index, void *value)
+{
+
+	mtp->mt_caller_pointer[index] = value;
+}
+
+uint64_t
+memstat_get_caller_uint64(const struct memory_type *mtp, int index)
+{
+
+	return (mtp->mt_caller_uint64[index]);
+}
+
+void
+memstat_set_caller_uint64(struct memory_type *mtp, int index, uint64_t value)
+{
+
+	mtp->mt_caller_uint64[index] = value;
+}
+
+uint64_t
+memstat_get_zonefree(const struct memory_type *mtp)
+{
+
+	return (mtp->mt_zonefree);
+}
+
+uint64_t
+memstat_get_kegfree(const struct memory_type *mtp)
+{
+
+	return (mtp->mt_kegfree);
+}
+
+uint64_t
+memstat_get_percpu_memalloced(const struct memory_type *mtp, int cpu)
+{
+
+	return (mtp->mt_percpu_alloc[cpu].mtp_memalloced);
+}
+
+uint64_t
+memstat_get_percpu_memfreed(const struct memory_type *mtp, int cpu)
+{
+
+	return (mtp->mt_percpu_alloc[cpu].mtp_memfreed);
+}
+
+uint64_t
+memstat_get_percpu_numallocs(const struct memory_type *mtp, int cpu)
+{
+
+	return (mtp->mt_percpu_alloc[cpu].mtp_numallocs);
+}
+
+uint64_t
+memstat_get_percpu_numfrees(const struct memory_type *mtp, int cpu)
+{
+
+	return (mtp->mt_percpu_alloc[cpu].mtp_numfrees);
+}
+
+uint64_t
+memstat_get_percpu_sizemask(const struct memory_type *mtp, int cpu)
+{
+
+	return (mtp->mt_percpu_alloc[cpu].mtp_sizemask);
+}
+
+void *
+memstat_get_percpu_caller_pointer(const struct memory_type *mtp, int cpu,
+    int index)
+{
+
+	return (mtp->mt_percpu_alloc[cpu].mtp_caller_pointer[index]);
+}
+
+void
+memstat_set_percpu_caller_pointer(struct memory_type *mtp, int cpu,
+    int index, void *value)
+{
+
+	mtp->mt_percpu_alloc[cpu].mtp_caller_pointer[index] = value;
+}
+
+uint64_t
+memstat_get_percpu_caller_uint64(const struct memory_type *mtp, int cpu,
+    int index)
+{
+
+	return (mtp->mt_percpu_alloc[cpu].mtp_caller_uint64[index]);
+}
+
+void
+memstat_set_percpu_caller_uint64(struct memory_type *mtp, int cpu, int index,
+    uint64_t value)
+{
+
+	mtp->mt_percpu_alloc[cpu].mtp_caller_uint64[index] = value;
+}
+
+uint64_t
+memstat_get_percpu_free(const struct memory_type *mtp, int cpu)
+{
+
+	return (mtp->mt_percpu_cache[cpu].mtp_free);
+}