Hmm...

.gitattributes

@@ -0,0 +1,2 @@
+*.cpp	ident
+# vim: shiftwidth=8 tabstop=8

.gitignore

@@ -0,0 +1 @@
+pstree

GNUmakefile

@@ -0,0 +1,6 @@
+LDFLAGS := -lkvm
+
+all: pstree
+
+clean:
+	rm -f pstree

pstree.cpp

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+// DT PS Tree
+//
+// Douglas Thrift
+//
+// $Id$
+
+#include <err.h>
+#include <fcntl.h>
+#include <kvm.h>
+#include <limits.h>
+#include <paths.h>
+#include <stdio.h>
+#include <sys/param.h>
+#include <sys/sysctl.h>
+#include <sys/user.h>
+
+int main(int argc, char *argv[])
+{
+	char error[_POSIX2_LINE_MAX];
+	kvm_t *kd = kvm_openfiles(NULL, _PATH_DEVNULL, NULL, O_RDONLY, error);
+
+	if (!kd)
+		errx(1, "%s", error);
+
+	int count;
+	struct kinfo_proc *procs = kvm_getprocs(kd, KERN_PROC_PROC, 0, &count);
+
+	if (!procs)
+		errx(1, "%s", kvm_geterr(kd));
+
+	for (struct kinfo_proc *proc = procs, *end = procs + count; proc != end; ++proc)
+		printf("%s %i %i\n", proc->ki_comm, proc->ki_pid, proc->ki_ppid);
+
+	return 0;
+}