From b941095f28d13288100dae54e14925ae41fd987c Mon Sep 17 00:00:00 2001
From: Craig Tiller <ctiller@google.com>
Date: Mon, 1 Feb 2016 14:10:27 -0800
Subject: [PATCH] Comments
---
src/core/support/env_linux.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/src/core/support/env_linux.c b/src/core/support/env_linux.c
index 183bcd2bd0..7bfd8415f8 100644
--- a/src/core/support/env_linux.c
+++ b/src/core/support/env_linux.c
@@ -49,11 +49,19 @@
#include "src/core/support/string.h"
+/* Declare weak symbols for versions of secure_getenv that *may* be
+ * on a users machine. Older libc's call this __secure_getenv, even
+ * older don't support the functionality.
+ *
+ * If a symbol is not present, these will be equal to NULL.
+ */
char *__attribute__((weak)) secure_getenv(const char *name);
char *__attribute__((weak)) __secure_getenv(const char *name);
char *gpr_getenv(const char *name) {
static char *(*getenv_func)(const char *) = secure_getenv;
+ /* Check to see which getenv variant is supported (go from most
+ * to least secure */
if (getenv_func == NULL) {
getenv_func = __secure_getenv;
if (getenv_func == NULL) {
--
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