move the method to look up process to a common place

Summary: As title in the task, I need to look up process info using this method. Move it to shared util class so that I can include them else where

Reviewed By: kmancini

Differential Revision: D49654377

fbshipit-source-id: d071926d023ef3a8cf2c92e1a328e4db11961bc5

CMakeLists.txt

@@ -605,6 +605,7 @@ watchman/PerfSample.cpp
 watchman/fs/ParallelWalk.cpp
 watchman/fs/Pipe.cpp
 watchman/ProcessLock.cpp
+watchman/ProcessUtil.cpp
 # PubSub.cpp  (in liblog)
 watchman/QueryableView.cpp
 watchman/SanityCheck.cpp

watchman/Client.cpp

@@ -9,11 +9,13 @@
 
 #include <folly/MapUtil.h>
 
+#include "eden/common/utils/ProcessInfoCache.h"
 #include "watchman/Command.h"
 #include "watchman/Errors.h"
 #include "watchman/Logging.h"
 #include "watchman/MapUtil.h"
 #include "watchman/Poison.h"
+#include "watchman/ProcessUtil.h"
 #include "watchman/QueryableView.h"
 #include "watchman/Shutdown.h"
 #include "watchman/root/Root.h"
@@ -23,17 +25,6 @@ namespace watchman {
 
 namespace {
 
-using namespace facebook::eden;
-
-ProcessInfoCache& getProcessInfoCache() {
-  static auto* pic = new ProcessInfoCache;
-  return *pic;
-}
-
-ProcessInfoHandle lookupProcessInfo(pid_t pid) {
-  return getProcessInfoCache().lookup(pid);
-}
-
 constexpr size_t kResponseLogLimit = 0;
 
 folly::Synchronized<std::unordered_set<UserClient*>> clients;

watchman/ProcessUtil.cpp

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include "watchman/ProcessUtil.h"
+
+#include "eden/common/utils/ProcessInfoCache.h"
+
+namespace watchman {
+
+using namespace facebook::eden;
+
+namespace {
+ProcessInfoCache& getProcessInfoCache() {
+  static auto* pic = new ProcessInfoCache;
+  return *pic;
+}
+} // namespace
+
+ProcessInfoHandle lookupProcessInfo(pid_t pid) {
+  return getProcessInfoCache().lookup(pid);
+}
+
+} // namespace watchman

watchman/ProcessUtil.h

@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#pragma once
+
+#include <folly/portability/SysTypes.h>
+
+namespace facebook::eden {
+class ProcessInfoHandle;
+}
+
+namespace watchman {
+
+using ProcessInfoHandle = facebook::eden::ProcessInfoHandle;
+
+ProcessInfoHandle lookupProcessInfo(pid_t pid);
+
+} // namespace watchman