Index: lib/libopenbsd/getdtablecount.c
===================================================================
--- /dev/null
+++ lib/libopenbsd/getdtablecount.c
@@ -0,0 +1,87 @@
+/*-
+ * Copyright (c) 2015 Craig Rodrigues
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/user.h>
+#include <sys/sysctl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+
+int getdtablecount(void);
+
+/* 
+ * Return the count of open file descriptors for this process.
+ *
+ */
+int
+getdtablecount(void)
+{
+	int mib[4];
+	int error;
+	int cnt;
+	pid_t pid;
+	size_t len;
+	char *buf, *bp, *eb;
+	struct kinfo_file *kf;
+
+	len = 0;
+	pid = getpid();
+	mib[0] = CTL_KERN;
+	mib[1] = KERN_PROC;
+	mib[2] = KERN_PROC_FILEDESC;
+	mib[3] = pid;
+
+	error = sysctl(mib, 4, NULL, &len, NULL, 0);
+	if (error)
+		return (-1);
+	len = len * 4 / 3;
+	buf = malloc(len);
+	if (buf == NULL)
+		return (-1);
+	error = sysctl(mib, 4, buf, &len, NULL, 0);
+	if (error) {
+		free(buf);
+		return (-1);
+	}
+	/* count items */
+	cnt = 0;
+	bp = buf;
+	eb = buf + len;
+	while (bp < eb) {
+		kf = (struct kinfo_file *)(uintptr_t)bp;
+		if (kf->kf_structsize == 0)
+			break;
+		bp += kf->kf_structsize;
+		cnt++;
+	}
+	free(buf);
+	return (cnt);
+}