--- Libc/Libc-763.13/stdlib/FreeBSD/getenv.c
+++ Libc/Libc-1669.40.2/stdlib/FreeBSD/getenv.c
@@ -33,14 +33,18 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD: src/lib/libc/stdlib/getenv.c,v 1.8 2007/05/01 16:02:41 ache Exp $");
 
+#include <os/lock_private.h>
 #include <stdlib.h>
 #include <stddef.h>
 #include <string.h>
+#include <crt_externs.h>
 
-inline char *__findenv(const char *, int *);
+#include "libc_private.h"
+
+__private_extern__ char *__findenv_locked(const char *, int *, char **);
 
 /*
- * __findenv --
+ * __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).
@@ -48,12 +52,9 @@
  *
  *	This routine *should* be a static; don't use it.
  */
-inline char *
-__findenv(name, offset)
-	const char *name;
-	int *offset;
+__private_extern__ char *
+__findenv_locked(const char *name, int *offset, char **environ)
 {
-	extern char **environ;
 	int len, i;
 	const char *np;
 	char **p, *cp;
@@ -75,15 +76,50 @@
 	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(name)
-	const char *name;
+getenv(const char *name)
 {
 	int offset;
-
-	return (__findenv(name, &offset));
+	environ_lock_np();
+	char *result = __findenv_locked(name, &offset, *_NSGetEnviron());
+	environ_unlock_np();
+	return result;
 }