--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dep/animone/src/fd/openbsd.cc	Wed Jun 19 13:06:10 2024 -0400
@@ -0,0 +1,153 @@
+/*
+ * fd/openbsd.cc: support for OpenBSD
+ *
+ * COMPLETELY UNTESTED. may or may not work.
+ */
+#include "animone/fd/bsd.h"
+#include "animone.h"
+#include "animone/fd.h"
+
+#include <sys/file.h>
+#include <sys/filedesc.h>
+#include <sys/param.h>
+#include <sys/queue.h>
+#include <sys/sysctl.h>
+#include <sys/types.h>
+#include <sys/user.h>
+#include <sys/vnode.h>
+
+#include <kvm.h>
+#include <fts.h>
+
+#include <string>
+
+namespace animone::internal::openbsd {
+
+/* XXX is this necessary */
+static std::string Basename(const std::string& name) {
+	size_t s = name.find_last_of('/');
+
+	if (s == std::string::npos)
+		return name;
+
+	return name.substr(s, name.size());
+}
+
+bool GetProcessName(pid_t pid, std::string& name) {
+	char errbuf[_POSIX2_LINE_MAX];
+	kvm_t* kernel = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, errbuf);
+	if (!kernel)
+		return false;
+
+	int entries = 0;
+	struct kinfo_proc* kinfo = kvm_getprocs(kernel, KERN_PROC_PID, pid, &entries);
+	if (!kinfo) {
+		kvm_close(kernel);
+		return false;
+	}
+
+	if (entries < 1) {
+		kvm_close(kernel);
+		return false;
+	}
+
+	name = Basename(kinfo[0].ki_paddr->p_comm);
+
+	return true;
+}
+
+bool EnumerateOpenProcesses(process_proc_t process_proc) {
+	char errbuf[_POSIX2_LINE_MAX];
+	kvm_t* kernel = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, errbuf);
+	if (!kernel)
+		return false;
+
+	int entries = 0;
+	struct kinfo_proc* kinfo = kvm_getprocs(kernel, KERN_PROC_ALL, 0, &entries);
+	if (!kinfo) {
+		kvm_close(kernel);
+		return false;
+	}
+
+	for (int i = 0; i < entries; i++) {
+		if (!process_proc({.platform = ExecutablePlatform::Posix, .pid = kinfo[i].ki_paddr->p_pid, .comm = Basename(kinfo[i].ki_paddr->p_comm)})) {
+			kvm_close(kernel);
+			return false;
+		}
+	}
+
+	kvm_close(kernel);
+
+	return true;
+}
+
+static bool GetOpenFileName(const struct kinfo_file& file, std::string& name) {
+	/* OpenBSD doesn't provide a native API for this, so we have
+	 * to do it ourselves */
+	static constexpr std::string_view root = "/";
+
+	FTS* file_system = fts_open(root.data(), FTS_COMFOLLOW | FTS_NOCHDIR, nullptr);
+	if (!file_system)
+		return false;
+
+	/* Search through the filesystem for a file that matches our
+	 * kinfo_file structure */
+	FTSENT* parent = nullptr;
+	while ((parent = fts_read(file_system))) {
+		FTSENT* child = fts_children(file_system, 0);
+		while (child && child->fts_link) {
+			child = child->fts_link;
+			if (!S_ISREG(child->fts_statp->st_mode) || !S_ISLNK(child->fts_statp->st_mode))
+				continue;
+
+			if (child->fts_statp->st_dev != file->va_fsid)
+				continue;
+
+			if (child->fts_statp->st_ino != file->va_fileid)
+				continue;
+
+			name = std::string(child->fts_path) + child->fts_name;
+			fts_close(file_system);
+			return true;
+		}
+	}
+
+	fts_close(filesystem);
+	return false;
+}
+
+bool EnumerateOpenFiles(const std::set<pid_t>& pids, open_file_proc_t open_file_proc) {
+	char errbuf[_POSIX2_LINE_MAX];
+	kvm_t* kernel = kvm_openfiles(nullptr, nullptr, nullptr, O_RDONLY, errbuf);
+	if (!kernel)
+		return false;
+
+	for (const auto& pid : pids) {
+		int cnt;
+		struct kinfo_file* kfile = kvm_getfiles(kernel, KERN_FILE_BYPID, pid, &cnt);
+		if (!kfile) {
+			kvm_close(kernel);
+			return false;
+		}
+
+		for (int i = 0; i < cnt; i++) {
+			uint32_t oflags = kfile[i].kf_flags & O_ACCMODE;
+			if (oflags == O_WRONLY || oflags == O_RDWR)
+				continue;
+
+			std::string name;
+			if (!GetOpenFileName(kfile[i], name))
+				continue;
+
+			if (!open_file_proc({pid, name})) {
+				kvm_close(kernel);
+				return false;
+			}
+		}
+	}
+
+	kvm_close(kernel);
+	return true;
+}
+
+} // namespace animone::internal::openbsd