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diff --git a/library/include/meminfo.h b/library/include/meminfo.h
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+/*
+ * meminfo.h - memory related declarations for libproc2
+ *
+ * Copyright © 2015-2023 Jim Warner <james.warner@comcast.net>
+ * Copyright © 2015-2023 Craig Small <csmall@dropbear.xyz>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef PROCPS_MEMINFO_H
+#define PROCPS_MEMINFO_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+enum meminfo_item {
+ MEMINFO_noop, // ( never altered )
+ MEMINFO_extra, // ( reset to zero )
+ /*
+ note: all of the following values are expressed as KiB
+ */
+ // returns origin, see proc(5)
+ // ------- -------------------
+ MEMINFO_MEM_ACTIVE, // ul_int /proc/meminfo
+ MEMINFO_MEM_ACTIVE_ANON, // ul_int "
+ MEMINFO_MEM_ACTIVE_FILE, // ul_int "
+ MEMINFO_MEM_ANON, // ul_int "
+ MEMINFO_MEM_AVAILABLE, // ul_int "
+ MEMINFO_MEM_BOUNCE, // ul_int "
+ MEMINFO_MEM_BUFFERS, // ul_int "
+ MEMINFO_MEM_CACHED, // ul_int "
+ MEMINFO_MEM_CACHED_ALL, // ul_int derived from MEM_CACHED + MEM_SLAB_RECLAIM
+ MEMINFO_MEM_CMA_FREE, // ul_int /proc/meminfo
+ MEMINFO_MEM_CMA_TOTAL, // ul_int "
+ MEMINFO_MEM_COMMITTED_AS, // ul_int "
+ MEMINFO_MEM_COMMIT_LIMIT, // ul_int "
+ MEMINFO_MEM_DIRECTMAP_1G, // ul_int "
+ MEMINFO_MEM_DIRECTMAP_2M, // ul_int "
+ MEMINFO_MEM_DIRECTMAP_4K, // ul_int "
+ MEMINFO_MEM_DIRECTMAP_4M, // ul_int "
+ MEMINFO_MEM_DIRTY, // ul_int "
+ MEMINFO_MEM_FILE_HUGEPAGES, // ul_int "
+ MEMINFO_MEM_FILE_PMDMAPPED, // ul_int "
+ MEMINFO_MEM_FREE, // ul_int "
+ MEMINFO_MEM_HARD_CORRUPTED, // ul_int "
+ MEMINFO_MEM_HIGH_FREE, // ul_int "
+ MEMINFO_MEM_HIGH_TOTAL, // ul_int "
+ MEMINFO_MEM_HIGH_USED, // ul_int derived from MEM_HIGH_TOTAL - MEM_HIGH_FREE
+ MEMINFO_MEM_HUGETBL, // ul_int /proc/meminfo
+ MEMINFO_MEM_HUGE_ANON, // ul_int "
+ MEMINFO_MEM_HUGE_FREE, // ul_int "
+ MEMINFO_MEM_HUGE_RSVD, // ul_int "
+ MEMINFO_MEM_HUGE_SIZE, // ul_int "
+ MEMINFO_MEM_HUGE_SURPLUS, // ul_int "
+ MEMINFO_MEM_HUGE_TOTAL, // ul_int "
+ MEMINFO_MEM_INACTIVE, // ul_int "
+ MEMINFO_MEM_INACTIVE_ANON, // ul_int "
+ MEMINFO_MEM_INACTIVE_FILE, // ul_int "
+ MEMINFO_MEM_KERNEL_RECLAIM, // ul_int "
+ MEMINFO_MEM_KERNEL_STACK, // ul_int "
+ MEMINFO_MEM_LOCKED, // ul_int "
+ MEMINFO_MEM_LOW_FREE, // ul_int "
+ MEMINFO_MEM_LOW_TOTAL, // ul_int "
+ MEMINFO_MEM_LOW_USED, // ul_int derived from MEM_LOW_TOTAL - MEM_LOW_FREE
+ MEMINFO_MEM_MAPPED, // ul_int /proc/meminfo
+ MEMINFO_MEM_MAP_COPY, // ul_int "
+ MEMINFO_MEM_NFS_UNSTABLE, // ul_int "
+ MEMINFO_MEM_PAGE_TABLES, // ul_int "
+ MEMINFO_MEM_PER_CPU, // ul_int "
+ MEMINFO_MEM_SHADOWCALLSTACK, // ul_int "
+ MEMINFO_MEM_SHARED, // ul_int "
+ MEMINFO_MEM_SHMEM_HUGE, // ul_int "
+ MEMINFO_MEM_SHMEM_HUGE_MAP, // ul_int "
+ MEMINFO_MEM_SLAB, // ul_int "
+ MEMINFO_MEM_SLAB_RECLAIM, // ul_int "
+ MEMINFO_MEM_SLAB_UNRECLAIM, // ul_int "
+ MEMINFO_MEM_TOTAL, // ul_int "
+ MEMINFO_MEM_UNEVICTABLE, // ul_int "
+ MEMINFO_MEM_USED, // ul_int derived from MEM_TOTAL - MEM_AVAILABLE
+ MEMINFO_MEM_VM_ALLOC_CHUNK, // ul_int /proc/meminfo
+ MEMINFO_MEM_VM_ALLOC_TOTAL, // ul_int "
+ MEMINFO_MEM_VM_ALLOC_USED, // ul_int "
+ MEMINFO_MEM_WRITEBACK, // ul_int "
+ MEMINFO_MEM_WRITEBACK_TMP, // ul_int "
+
+ MEMINFO_DELTA_ACTIVE, // s_int derived from above
+ MEMINFO_DELTA_ACTIVE_ANON, // s_int "
+ MEMINFO_DELTA_ACTIVE_FILE, // s_int "
+ MEMINFO_DELTA_ANON, // s_int "
+ MEMINFO_DELTA_AVAILABLE, // s_int "
+ MEMINFO_DELTA_BOUNCE, // s_int "
+ MEMINFO_DELTA_BUFFERS, // s_int "
+ MEMINFO_DELTA_CACHED, // s_int "
+ MEMINFO_DELTA_CACHED_ALL, // s_int "
+ MEMINFO_DELTA_CMA_FREE, // s_int "
+ MEMINFO_DELTA_CMA_TOTAL, // s_int "
+ MEMINFO_DELTA_COMMITTED_AS, // s_int "
+ MEMINFO_DELTA_COMMIT_LIMIT, // s_int "
+ MEMINFO_DELTA_DIRECTMAP_1G, // s_int "
+ MEMINFO_DELTA_DIRECTMAP_2M, // s_int "
+ MEMINFO_DELTA_DIRECTMAP_4K, // s_int "
+ MEMINFO_DELTA_DIRECTMAP_4M, // s_int "
+ MEMINFO_DELTA_DIRTY, // s_int "
+ MEMINFO_DELTA_FILE_HUGEPAGES, // s_int "
+ MEMINFO_DELTA_FILE_PMDMAPPED, // s_int "
+ MEMINFO_DELTA_FREE, // s_int "
+ MEMINFO_DELTA_HARD_CORRUPTED, // s_int "
+ MEMINFO_DELTA_HIGH_FREE, // s_int "
+ MEMINFO_DELTA_HIGH_TOTAL, // s_int "
+ MEMINFO_DELTA_HIGH_USED, // s_int "
+ MEMINFO_DELTA_HUGETBL, // s_int "
+ MEMINFO_DELTA_HUGE_ANON, // s_int "
+ MEMINFO_DELTA_HUGE_FREE, // s_int "
+ MEMINFO_DELTA_HUGE_RSVD, // s_int "
+ MEMINFO_DELTA_HUGE_SIZE, // s_int "
+ MEMINFO_DELTA_HUGE_SURPLUS, // s_int "
+ MEMINFO_DELTA_HUGE_TOTAL, // s_int "
+ MEMINFO_DELTA_INACTIVE, // s_int "
+ MEMINFO_DELTA_INACTIVE_ANON, // s_int "
+ MEMINFO_DELTA_INACTIVE_FILE, // s_int "
+ MEMINFO_DELTA_KERNEL_RECLAIM, // s_int "
+ MEMINFO_DELTA_KERNEL_STACK, // s_int "
+ MEMINFO_DELTA_LOCKED, // s_int "
+ MEMINFO_DELTA_LOW_FREE, // s_int "
+ MEMINFO_DELTA_LOW_TOTAL, // s_int "
+ MEMINFO_DELTA_LOW_USED, // s_int "
+ MEMINFO_DELTA_MAPPED, // s_int "
+ MEMINFO_DELTA_MAP_COPY, // s_int "
+ MEMINFO_DELTA_NFS_UNSTABLE, // s_int "
+ MEMINFO_DELTA_PAGE_TABLES, // s_int "
+ MEMINFO_DELTA_PER_CPU, // s_int "
+ MEMINFO_DELTA_SHADOWCALLSTACK, // s_int "
+ MEMINFO_DELTA_SHARED, // s_int "
+ MEMINFO_DELTA_SHMEM_HUGE, // s_int "
+ MEMINFO_DELTA_SHMEM_HUGE_MAP, // s_int "
+ MEMINFO_DELTA_SLAB, // s_int "
+ MEMINFO_DELTA_SLAB_RECLAIM, // s_int "
+ MEMINFO_DELTA_SLAB_UNRECLAIM, // s_int "
+ MEMINFO_DELTA_TOTAL, // s_int "
+ MEMINFO_DELTA_UNEVICTABLE, // s_int "
+ MEMINFO_DELTA_USED, // s_int "
+ MEMINFO_DELTA_VM_ALLOC_CHUNK, // s_int "
+ MEMINFO_DELTA_VM_ALLOC_TOTAL, // s_int "
+ MEMINFO_DELTA_VM_ALLOC_USED, // s_int "
+ MEMINFO_DELTA_WRITEBACK, // s_int "
+ MEMINFO_DELTA_WRITEBACK_TMP, // s_int "
+
+ MEMINFO_SWAP_CACHED, // ul_int /proc/meminfo
+ MEMINFO_SWAP_FREE, // ul_int "
+ MEMINFO_SWAP_TOTAL, // ul_int "
+ MEMINFO_SWAP_USED, // ul_int derived from SWAP_TOTAL - SWAP_FREE
+
+ MEMINFO_SWAP_DELTA_CACHED, // s_int derived from above
+ MEMINFO_SWAP_DELTA_FREE, // s_int "
+ MEMINFO_SWAP_DELTA_TOTAL, // s_int "
+ MEMINFO_SWAP_DELTA_USED // s_int "
+};
+
+
+struct meminfo_result {
+ enum meminfo_item item;
+ union {
+ signed int s_int;
+ unsigned long ul_int;
+ } result;
+};
+
+struct meminfo_stack {
+ struct meminfo_result *head;
+};
+
+struct meminfo_info;
+
+
+#define MEMINFO_GET( info, actual_enum, type ) ( { \
+ struct meminfo_result *r = procps_meminfo_get( info, actual_enum ); \
+ r ? r->result . type : 0; } )
+
+#define MEMINFO_VAL( relative_enum, type, stack, info ) \
+ stack -> head [ relative_enum ] . result . type
+
+
+int procps_meminfo_new (struct meminfo_info **info);
+int procps_meminfo_ref (struct meminfo_info *info);
+int procps_meminfo_unref (struct meminfo_info **info);
+
+struct meminfo_result *procps_meminfo_get (
+ struct meminfo_info *info,
+ enum meminfo_item item);
+
+struct meminfo_stack *procps_meminfo_select (
+ struct meminfo_info *info,
+ enum meminfo_item *items,
+ int numitems);
+
+
+#ifdef XTRA_PROCPS_DEBUG
+# include "xtra-procps-debug.h"
+#endif
+#ifdef __cplusplus
+}
+#endif
+#endif
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