1 files changed, 72 insertions, 0 deletions
diff --git a/lib/libc/stdlib/hcreate.c b/lib/libc/stdlib/hcreate.c
new file mode 100644
index 000000000000..261f55bfec39
--- /dev/null
+++ b/lib/libc/stdlib/hcreate.c
@@ -0,0 +1,72 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2015 Nuxi, https://nuxi.nl/
+ *
+ * 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 <search.h>
+#include <stdbool.h>
+#include <stddef.h>
+
+/*
+ * Thread unsafe interface: use a single process-wide hash table and
+ * forward calls to *_r() functions.
+ */
+
+static struct hsearch_data global_hashtable;
+static bool global_hashtable_initialized = false;
+
+int
+hcreate(size_t nel)
+{
+
+	return (1);
+}
+
+void
+hdestroy(void)
+{
+
+	/* Destroy global hash table if present. */
+	if (global_hashtable_initialized) {
+		hdestroy_r(&global_hashtable);
+		global_hashtable_initialized = false;
+	}
+}
+
+ENTRY *
+hsearch(ENTRY item, ACTION action)
+{
+	ENTRY *retval;
+
+	/* Create global hash table if needed. */
+	if (!global_hashtable_initialized) {
+		if (hcreate_r(0, &global_hashtable) == 0)
+			return (NULL);
+		global_hashtable_initialized = true;
+	}
+	if (hsearch_r(item, action, &retval, &global_hashtable) == 0)
+		return (NULL);
+	return (retval);
+}