Enable reading process environment variables in EventPipe (#87771)

* Process Environment support

* using free to match malloc

* Add test to CI

* Fix FreeBSD build break

* Fix typo in OSX environ def

* FB

Author: LakshanF

eng/pipelines/runtime.yml

@@ -248,7 +248,7 @@ extends:
             extraStepsTemplate: /eng/pipelines/coreclr/nativeaot-post-build-steps.yml
             extraStepsParameters:
               creator: dotnet-bot
-              testBuildArgs: 'nativeaot tree ";nativeaot;Loader;Interop;tracing/eventpipe/config;tracing/eventpipe/diagnosticport;tracing/eventpipe/reverse;tracing/eventpipe/simpleruntimeeventvalidation;" test tracing/eventcounter/runtimecounters.csproj /p:BuildNativeAotFrameworkObjects=true'
+              testBuildArgs: 'nativeaot tree ";nativeaot;Loader;Interop;tracing/eventpipe/config;tracing/eventpipe/diagnosticport;tracing/eventpipe/reverse;tracing/eventpipe/processenvironment;tracing/eventpipe/simpleruntimeeventvalidation;" test tracing/eventcounter/runtimecounters.csproj /p:BuildNativeAotFrameworkObjects=true'
               liveLibrariesBuildConfig: Release
             testRunNamePrefixSuffix: NativeAOT_$(_BuildConfig)
             extraVariablesTemplates:

src/coreclr/nativeaot/Runtime/eventpipe/ds-rt-aot.cpp

@@ -1,6 +1,12 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+#ifdef TARGET_WINDOWS
+#include <windows.h>
+#else
+#include <stdlib.h>
+#endif
+
 #include <sys/types.h>
 
 #ifdef __APPLE__
@@ -227,4 +233,19 @@ ds_rt_aot_transport_get_default_name (
     return true;
 #endif
 }
+
+uint32_t
+ds_rt_aot_set_environment_variable (const ep_char16_t *name, const ep_char16_t *value)
+{
+#ifdef TARGET_UNIX
+    ep_char8_t *nameNarrow = ep_rt_utf16le_to_utf8_string (name, ep_rt_utf16_string_len (name));
+    ep_char8_t *valueNarrow = ep_rt_utf16le_to_utf8_string (value, ep_rt_utf16_string_len (value));
+    int32_t ret_value = setenv(nameNarrow, valueNarrow, 1);
+    free(nameNarrow);
+    free(valueNarrow);
+    return ret_value;
+#else
+    return SetEnvironmentVariableW(reinterpret_cast<LPCWSTR>(name), reinterpret_cast<LPCWSTR>(value)) ? S_OK : HRESULT_FROM_WIN32(GetLastError());
+#endif
+}
 #endif /* ENABLE_PERFTRACING */

src/coreclr/nativeaot/Runtime/eventpipe/ds-rt-aot.h

@@ -266,9 +266,8 @@ static
 uint32_t
 ds_rt_set_environment_variable (const ep_char16_t *name, const ep_char16_t *value)
 {
-     // return SetEnvironmentVariableW(reinterpret_cast<LPCWSTR>(name), reinterpret_cast<LPCWSTR>(value)) ? S_OK : HRESULT_FROM_WIN32(GetLastError());
-     // PalDebugBreak();
-    return 0xffff;
+    extern uint32_t ds_rt_aot_set_environment_variable (const ep_char16_t *name, const ep_char16_t *value);
+    return ds_rt_aot_set_environment_variable(name, value);
 }
 
 static

src/coreclr/nativeaot/Runtime/eventpipe/ep-rt-aot.cpp

@@ -669,6 +669,44 @@ bool ep_rt_aot_spin_lock_release (ep_rt_spin_lock_handle_t *spin_lock)
     return false;
 }
 
+#ifndef HOST_WIN32
+#if defined(__APPLE__)
+#if defined (HOST_OSX)
+extern "C" {char ***_NSGetEnviron(void);}
+#define environ (*_NSGetEnviron())
+#else
+static char *_ep_rt_aot_environ[1] = { NULL };
+#define environ _ep_rt_aot_environ
+#endif /* defined (HOST_OSX) */
+#else
+extern "C" {
+extern char **environ;
+}
+#endif /* defined (__APPLE__) */
+#endif /* !defined (HOST_WIN32) */
+
+void ep_rt_aot_os_environment_get_utf16 (dn_vector_ptr_t *env_array)
+{
+    STATIC_CONTRACT_NOTHROW;
+    EP_ASSERT (env_array != NULL);
+
+#ifdef HOST_WIN32
+    ep_char16_t * envs = reinterpret_cast<ep_char16_t *>(GetEnvironmentStringsW ());
+    if (envs) {
+        const ep_char16_t * next = envs;
+        while (*next) {
+            dn_vector_ptr_push_back (env_array, ep_rt_utf16_string_dup (reinterpret_cast<const ep_char16_t *>(next)));
+            next += ep_rt_utf16_string_len (reinterpret_cast<const ep_char16_t *>(next)) + 1;
+        }
+        FreeEnvironmentStringsW (reinterpret_cast<LPWSTR>(envs));
+    }
+#else
+    ep_char8_t **next = NULL;
+    for (next = environ; *next != NULL; ++next)
+        dn_vector_ptr_push_back (env_array, ep_rt_utf8_to_utf16le_string (*next, -1));
+#endif
+}
+
 #ifdef EP_CHECKED_BUILD
 
 void ep_rt_aot_lock_requires_lock_held (const ep_rt_lock_handle_t *lock)

src/coreclr/nativeaot/Runtime/eventpipe/ep-rt-aot.h

@@ -1114,10 +1114,8 @@ static
 void
 ep_rt_os_environment_get_utf16 (dn_vector_ptr_t *env_array)
 {
-    STATIC_CONTRACT_NOTHROW;
-    EP_ASSERT (env_array != NULL);
-
-    // PalDebugBreak();
+    extern void ep_rt_aot_os_environment_get_utf16 (dn_vector_ptr_t *env_array);
+    ep_rt_aot_os_environment_get_utf16(env_array);
 }
 
 /*

src/tests/tracing/eventpipe/processenvironment/processenvironment.csproj

@@ -8,6 +8,7 @@
     <GCStressIncompatible>true</GCStressIncompatible>
     <JitOptimizationSensitive>true</JitOptimizationSensitive>
     <IlasmRoundTripIncompatible>true</IlasmRoundTripIncompatible>
+    <EventSourceSupport Condition="'$(TestBuildMode)' == 'nativeaot'">true</EventSourceSupport>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="$(MSBuildProjectName).cs" />