Move all PID file stuff to init.cpp

It is only used from init.cpp.
Move-only refactoring.

src/init.cpp

@@ -94,6 +94,30 @@ std::unique_ptr<BanMan> g_banman;
 
 static const char* FEE_ESTIMATES_FILENAME="fee_estimates.dat";
 
+/**
+ * The PID file facilities.
+ */
+#ifndef WIN32
+static const char* BITCOIN_PID_FILENAME = "bitcoind.pid";
+
+static fs::path GetPidFile()
+{
+    return AbsPathForConfigVal(fs::path(gArgs.GetArg("-pid", BITCOIN_PID_FILENAME)));
+}
+
+NODISCARD static bool CreatePidFile()
+{
+    FILE* file = fsbridge::fopen(GetPidFile(), "w");
+    if (file) {
+        fprintf(file, "%d\n", getpid());
+        fclose(file);
+        return true;
+    } else {
+        return InitError(strprintf(_("Unable to create the PID file '%s': %s"), GetPidFile().string(), std::strerror(errno)));
+    }
+}
+#endif
+
 //////////////////////////////////////////////////////////////////////////////
 //
 // Shutdown
@@ -1194,20 +1218,6 @@ bool AppInitLockDataDirectory()
     return true;
 }
 
-#ifndef WIN32
-NODISCARD static bool CreatePidFile()
-{
-    FILE* file = fsbridge::fopen(GetPidFile(), "w");
-    if (file) {
-        fprintf(file, "%d\n", getpid());
-        fclose(file);
-        return true;
-    } else {
-        return InitError(strprintf(_("Unable to create the PID file '%s': %s"), GetPidFile().string(), std::strerror(errno)));
-    }
-}
-#endif
-
 bool AppInitMain(InitInterfaces& interfaces)
 {
     const CChainParams& chainparams = Params();

src/util/system.cpp

@@ -79,7 +79,6 @@
 const int64_t nStartupTime = GetTime();
 
 const char * const BITCOIN_CONF_FILENAME = "bitcoin.conf";
-const char * const BITCOIN_PID_FILENAME = "bitcoind.pid";
 
 ArgsManager gArgs;
 
@@ -958,13 +957,6 @@ std::string ArgsManager::GetChainName() const
     return CBaseChainParams::MAIN;
 }
 
-#ifndef WIN32
-fs::path GetPidFile()
-{
-    return AbsPathForConfigVal(fs::path(gArgs.GetArg("-pid", BITCOIN_PID_FILENAME)));
-}
-#endif
-
 bool RenameOver(fs::path src, fs::path dest)
 {
 #ifdef WIN32

src/util/system.h

@@ -39,7 +39,6 @@
 int64_t GetStartupTime();
 
 extern const char * const BITCOIN_CONF_FILENAME;
-extern const char * const BITCOIN_PID_FILENAME;
 
 /** Translate a message to the native language of the user. */
 const extern std::function<std::string(const char*)> G_TRANSLATION_FUN;
@@ -84,9 +83,6 @@ const fs::path &GetBlocksDir();
 const fs::path &GetDataDir(bool fNetSpecific = true);
 void ClearDatadirCache();
 fs::path GetConfigFile(const std::string& confPath);
-#ifndef WIN32
-fs::path GetPidFile();
-#endif
 #ifdef WIN32
 fs::path GetSpecialFolderPath(int nFolder, bool fCreate = true);
 #endif