--- /dev/null
+++ Libc/Libc-1725.0.11/stdlib/FreeBSD/getenv.c
@@ -0,0 +1,194 @@
+/*
+ * Copyright (c) 1987, 1993
+ *	The Regents of the University of California.  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.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)getenv.c	8.1 (Berkeley) 6/4/93";
+#endif /* LIBC_SCCS and not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: src/lib/libc/stdlib/getenv.c,v 1.8 2007/05/01 16:02:41 ache Exp $");
+
+#include <errno.h>
+#include <os/lock_private.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+#include <crt_externs.h>
+
+#include "libc_private.h"
+
+__private_extern__ char *__findenv_locked(const char *, int *, char **);
+
+/*
+ * __findenv_locked --
+ *	Returns pointer to value associated with name, if any, else NULL.
+ *	Sets offset to be the offset of the name/value combination in the
+ *	environmental array, for use by setenv(3) and unsetenv(3).
+ *	Explicitly removes '=' in argument name.
+ *
+ *	This routine *should* be a static; don't use it.
+ */
+__private_extern__ char *
+__findenv_locked(const char *name, int *offset, char **environ)
+{
+	int len, i;
+	const char *np;
+	char **p, *cp;
+
+	if (name == NULL || environ == NULL)
+		return (NULL);
+	for (np = name; *np && *np != '='; ++np)
+		continue;
+	len = np - name;
+	for (p = environ; (cp = *p) != NULL; ++p) {
+		for (np = name, i = len; i && *cp; i--)
+			if (*cp++ != *np++)
+				break;
+		if (i == 0 && *cp++ == '=') {
+			*offset = p - environ;
+			return (cp);
+		}
+	}
+	return (NULL);
+}
+
+static os_unfair_lock __environ_lock_obj = OS_UNFAIR_LOCK_INIT;
+void
+environ_lock_np(void)
+{
+	os_unfair_lock_lock_with_options(
+			&__environ_lock_obj, OS_UNFAIR_LOCK_DATA_SYNCHRONIZATION);
+}
+void
+environ_unlock_np(void)
+{
+	os_unfair_lock_unlock(&__environ_lock_obj);
+}
+__private_extern__ void
+__environ_lock_fork_child(void)
+{
+	__environ_lock_obj = OS_UNFAIR_LOCK_INIT;
+}
+
+/*
+ * _getenvp -- SPI using an arbitrary pointer to string array (the array must
+ * have been created with malloc) and an env state, created by _allocenvstate().
+ *	Returns ptr to value associated with name, if any, else NULL.
+ */
+char *
+_getenvp(const char *name, char ***envp, void *state __unused)
+{
+	// envp is passed as an argument, so the lock is not protecting everything
+	int offset;
+	environ_lock_np();
+	char *result = (__findenv_locked(name, &offset, *envp));
+	environ_unlock_np();
+	return result;
+}
+
+/*
+ * getenv --
+ *	Returns ptr to value associated with name, if any, else NULL.
+ */
+char *
+getenv(const char *name)
+{
+	int offset;
+	environ_lock_np();
+	char *result = __findenv_locked(name, &offset, *_NSGetEnviron());
+	environ_unlock_np();
+	return result;
+}
+
+/*
+ * getenv_copy_np --
+ *	Returns ptr to copy of value associated with name, if any, else NULL.
+ *	Caller is responsible for freeing the return value.
+ *	Sets errno == ENOMEM and returns NULL if memory allocation fails.
+ *	Sets errno == EAGAIN and returns NULL if 5 attempts to copy the
+ *	string fails.
+ */
+char *
+getenv_copy_np(const char *name)
+{
+	/*
+	 * malloc() calls getenv() (which takes the environ_lock_np()), so
+	 * strdup() can not be called with environ_lock_np() held. Instead,
+	 * perform a two-step check for the length of the value (under lock),
+	 * then allocate a buffer, then try to copy the value into the buffer
+	 * (under lock). If the value of the environment variable changed such
+	 * that it no longer fits in the buffer, then try again up to four more
+	 * times. This algorithm is prescribed when using getenv_s() (ISO-C
+	 * Annex K), so this function abstracts that from the user since it is
+	 * difficult to implement correctly.
+	 */
+	unsigned attempts = 0;
+	char *result_buffer = NULL;
+	size_t result_buffer_length = 0;
+	int unused_offset;
+	char *value;
+	size_t value_length;
+
+	/* 1. Get the length of the value. */
+	environ_lock_np();
+	value = __findenv_locked(name, &unused_offset, *_NSGetEnviron());
+	value_length = value ? strlen(value) : 0;
+	environ_unlock_np();
+
+	if (!value)
+		return NULL;
+
+	do {
+		if (++attempts > 5) {
+			errno = EAGAIN;
+			return NULL;
+		}
+
+		/* 2. Allocate a buffer for the copy.  Round up to nearest/next 16 bytes. */
+		result_buffer_length = value_length + 1;
+		result_buffer_length += (16 - (result_buffer_length % 16));
+		result_buffer = (char *)reallocf((void *)result_buffer, result_buffer_length);
+		if (result_buffer == NULL) {
+			/* reallocf() sets errno = ENOMEM on failure. */
+			return NULL;
+		}
+
+		/* 3. Get the variable again and make a copy. */
+		environ_lock_np();
+		value = __findenv_locked(name, &unused_offset, *_NSGetEnviron());
+		value_length = value ? strlcpy(result_buffer, value, result_buffer_length) : 0;
+		environ_unlock_np();
+
+		if (!value)
+			return NULL;
+
+		/* 4. If value was too long for buffer, try again. */
+	} while (value_length >= result_buffer_length);
+
+	return result_buffer;
+}