Adding linux specific env implementation.

Makefile

@@ -1216,6 +1216,7 @@ LIBGPR_SRC = \
     src/core/support/cmdline.c \
     src/core/support/cpu_linux.c \
     src/core/support/cpu_posix.c \
+    src/core/support/env_linux.c \
     src/core/support/env_posix.c \
     src/core/support/env_win32.c \
     src/core/support/file.c \
@@ -1310,6 +1311,7 @@ objs/$(CONFIG)/src/core/support/cancellable.o:
 objs/$(CONFIG)/src/core/support/cmdline.o: 
 objs/$(CONFIG)/src/core/support/cpu_linux.o: 
 objs/$(CONFIG)/src/core/support/cpu_posix.o: 
+objs/$(CONFIG)/src/core/support/env_linux.o: 
 objs/$(CONFIG)/src/core/support/env_posix.o: 
 objs/$(CONFIG)/src/core/support/env_win32.o: 
 objs/$(CONFIG)/src/core/support/file.o: 

build.json

@@ -241,6 +241,7 @@
         "src/core/support/cmdline.c",
         "src/core/support/cpu_linux.c",
         "src/core/support/cpu_posix.c",
+        "src/core/support/env_linux.c",
         "src/core/support/env_posix.c",
         "src/core/support/env_win32.c",
         "src/core/support/file.c",

include/grpc/support/port_platform.h

@@ -76,7 +76,7 @@
 #define GPR_LINUX_EVENTFD 1
 #define GPR_POSIX_SOCKET 1
 #define GPR_POSIX_SOCKETADDR 1
-#define GPR_POSIX_ENV 1
+#define GPR_LINUX_ENV 1
 #define GPR_POSIX_FILE 1
 #define GPR_POSIX_STRING 1
 #define GPR_POSIX_SYNC 1

src/core/support/env_posix.c

@@ -31,11 +31,6 @@
  *
  */
 
-/* for secure_getenv. */
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
 #include <grpc/support/port_platform.h>
 
 #ifdef GPR_POSIX_ENV
@@ -49,7 +44,7 @@
 #include "src/core/support/string.h"
 
 char *gpr_getenv(const char *name) {
-  char *result = secure_getenv(name);
+  char *result = getenv(name);
   return result == NULL ? result : gpr_strdup(result);
 }
 

vsprojects/vs2013/gpr.vcxproj

@@ -117,6 +117,8 @@
     </ClCompile>
     <ClCompile Include="..\..\src\core\support\cpu_posix.c">
     </ClCompile>
+    <ClCompile Include="..\..\src\core\support\env_linux.c">
+    </ClCompile>
     <ClCompile Include="..\..\src\core\support\env_posix.c">
     </ClCompile>
     <ClCompile Include="..\..\src\core\support\env_win32.c">

vsprojects/vs2013/gpr.vcxproj.filters

@@ -16,6 +16,9 @@
     <ClCompile Include="..\..\src\core\support\cpu_posix.c">
       <Filter>src\core\support</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\src\core\support\env_linux.c">
+      <Filter>src\core\support</Filter>
+    </ClCompile>
     <ClCompile Include="..\..\src\core\support\env_posix.c">
       <Filter>src\core\support</Filter>
     </ClCompile>