--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dep/animia/src/platform/bsd/fd.cc	Fri Nov 10 13:52:47 2023 -0500
@@ -0,0 +1,124 @@
+/**
+ * bsd.cpp
+ *  - provides support for most* versions of BSD
+ *  - this also works for OS X :)
+ * more technical details: this is essentially a wrapper
+ * around the very C-like BSD system functions that are...
+ * kind of unnatural to use in modern C++.
+ **/
+#include <fcntl.h>
+#include <iostream>
+#include <string>
+#include <sys/sysctl.h>
+#include <sys/types.h>
+#include <sys/user.h>
+#include <unordered_map>
+#include <vector>
+#ifdef __FreeBSD__
+#	include <libutil.h>
+#elif defined(__APPLE__)
+#	include <libproc.h>
+#endif
+
+namespace Animia { namespace Unix {
+
+/* this is a cleaned up version of a function from... Apple?
+   ...anyway, what it essentially does is gets the size and stuff from
+   sysctl() and reserves the space in a vector to store the PIDs */
+std::vector<int> get_all_pids() {
+	std::vector<int> ret;
+	struct kinfo_proc* result = NULL;
+	size_t length = 0;
+	static const int name[] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL, 0};
+
+	/* get appropriate length from sysctl()
+	   note: the reason this isn't checked is actually because this will
+	   *always* return an error on OS X (or... maybe I'm doing it wrong :) ) */
+	sysctl((int*)name, (sizeof(name) / sizeof(*name)) - 1, NULL, &length, NULL, 0);
+
+	result = (struct kinfo_proc*)malloc(length);
+	if (result == NULL)
+		return std::vector<int>();
+
+	/* actually get our results */
+	if (sysctl((int*)name, (sizeof(name) / sizeof(*name)) - 1, result, &length, NULL, 0) == ENOMEM) {
+		assert(result != NULL);
+		free(result);
+		throw std::bad_alloc();
+	}
+
+	/* add pids to our vector */
+	ret.reserve(length / sizeof(*result));
+	for (int i = 0; i < length / sizeof(*result); i++)
+		ret.push_back(result[i].kp_proc.p_pid);
+
+	return ret;
+}
+
+std::string get_process_name(int pid) {
+	std::string ret;
+#ifdef __FreeBSD__
+	struct kinfo_proc* proc = kinfo_getproc(pid);
+	if (!proc)
+		return "";
+	ret = proc->ki_comm;
+	free(proc);
+#elif defined(__APPLE__)
+	struct proc_bsdinfo proc;
+
+	int st = proc_pidinfo(pid, PROC_PIDTBSDINFO, 0, &proc, PROC_PIDTBSDINFO_SIZE);
+	if (st != PROC_PIDTBSDINFO_SIZE)
+		return "";
+	ret = proc.pbi_comm;
+#endif
+	return ret;
+}
+
+std::vector<std::string> get_open_files(int pid) {
+	/* note: this is OS X only right now. eventually, I'll find a way
+	   to do this in FreeBSD, OpenBSD and the like */
+	std::vector<std::string> ret;
+
+	if (pid == 0)
+		return ret;
+
+	int bufsz = proc_pidinfo(pid, PROC_PIDLISTFDS, 0, NULL, 0);
+	if (bufsz == -1)
+		return ret;
+
+	struct proc_fdinfo* info = (struct proc_fdinfo*)malloc(bufsz);
+	if (!info)
+		return ret;
+
+	proc_pidinfo(pid, PROC_PIDLISTFDS, 0, info, bufsz);
+
+	// iterate over stuff
+	ret.reserve(bufsz / sizeof(info[0]));
+	for (int i = 0; i < bufsz / sizeof(info[0]); i++) {
+		if (info[i].proc_fdtype == PROX_FDTYPE_VNODE) {
+			struct vnode_fdinfowithpath vnodeInfo;
+
+			int sz = proc_pidfdinfo(pid, info[i].proc_fd, PROC_PIDFDVNODEPATHINFO, &vnodeInfo, PROC_PIDFDVNODEPATHINFO_SIZE);
+			if (sz != PROC_PIDFDVNODEPATHINFO_SIZE)
+				continue;
+
+			if (vnodeInfo.pfi.fi_openflags & O_WRONLY || vnodeInfo.pfi.fi_openflags & O_RDWR)
+				continue;
+
+			ret.push_back(vnodeInfo.pvip.vip_path);
+		}
+	}
+	return ret;
+}
+
+std::unordered_map<int, std::vector<std::string>> get_all_open_files() {
+	std::unordered_map<int, std::vector<std::string>> map;
+	std::vector<int> pids = get_all_pids();
+	for (int i : pids) {
+		map[i] = get_open_files(i);
+	}
+	return map;
+}
+
+} // namespace Unix
+} // namespace Animia