--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dep/animia/src/fd/libutil.cc	Sun Nov 19 04:21:56 2023 -0500
@@ -0,0 +1,71 @@
+/* This file uses the FreeBSD-specific libprocstat
+*/
+
+#include "animia/fd/libutil.h"
+#include "animia/fd.h"
+#include "animia.h"
+
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#include <sys/user.h>
+#include <libutil.h>
+
+#include <memory>
+
+namespace animia::internal::libutil {
+
+static bool IsSystemFile(const std::string& file) {
+	return (!file.find("/usr") || !file.find("/lib") || !file.find("/dev") ||
+		    !file.find("/proc"));
+}
+
+bool LibutilFdTools::EnumerateOpenProcesses(process_proc_t process_proc) {
+	static const int mib[] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL, 0};
+	size_t length = 0;
+
+	sysctl((int*)mib, (sizeof(mib) / sizeof(*mib)) - 1, NULL, &length, NULL, 0);
+
+	std::unique_ptr<struct kinfo_proc[]> result;
+	result.reset(new struct kinfo_proc[length]);
+
+	if (!result.get())
+		return false;
+
+	/* actually get our results */
+	if (sysctl((const int*)mib, (sizeof(mib) / sizeof(*mib)) - 1, result.get(), &length, NULL, 0) == ENOMEM) {
+		result.reset();
+		throw std::bad_alloc();
+	}
+
+	if (length < sizeof(struct kinfo_proc))
+		return false;
+
+	for (int i = 0; i < length / sizeof(result[0]); i++)
+		if (!process_proc({result[i].ki_pid, result[i].ki_comm}))
+			return false;
+
+	return true;
+}
+
+bool LibutilFdTools::EnumerateOpenFiles(const std::set<pid_t>& pids, open_file_proc_t open_file_proc) {
+	for (const auto& pid : pids) {
+		int cnt;
+		std::unique_ptr<struct kinfo_file[]> files;
+		files.reset(kinfo_getfile(pid, &cnt));
+		if (!files.get())
+			return false;
+
+		for (int i = 0; i < cnt; i++) {
+			const struct kinfo_file& current = files[i];
+			if (current.kf_vnode_type != KF_VTYPE_VREG)
+				continue;
+
+			if (!open_file_proc({pid, current.kf_path}))
+				return false;
+		}
+	}
+
+	return true;
+}
+
+}
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