src: abstract getpid() operation

There are a few places where we paper over the fact that getpid() is
called GetCurrentProcessId() on Windows.  Let's move it into a function.

PR-URL: https://github.com/nodejs/node/pull/17087
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Eugene Ostroukhov <eostroukhov@google.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>

src/env.cc

@@ -4,12 +4,6 @@
 #include "node_buffer.h"
 #include "node_platform.h"
 
-#if defined(_MSC_VER)
-#define getpid GetCurrentProcessId
-#else
-#include <unistd.h>
-#endif
-
 #include <stdio.h>
 #include <algorithm>
 
@@ -184,7 +178,8 @@ void Environment::PrintSyncTrace() const {
   Local<v8::StackTrace> stack =
       StackTrace::CurrentStackTrace(isolate(), 10, StackTrace::kDetailed);
 
-  fprintf(stderr, "(node:%d) WARNING: Detected use of sync API\n", getpid());
+  fprintf(stderr, "(node:%u) WARNING: Detected use of sync API\n",
+          GetProcessId());
 
   for (int i = 0; i < stack->GetFrameCount() - 1; i++) {
     Local<StackFrame> stack_frame = stack->GetFrame(i);

src/inspector_agent.cc

@@ -13,8 +13,8 @@
 #include <vector>
 
 #ifdef __POSIX__
-#include <limits.h>
-#include <unistd.h>  // setuid, getuid
+#include <limits.h>  // PTHREAD_STACK_MIN
+#include <pthread.h>
 #endif  // __POSIX__
 
 namespace node {
@@ -108,7 +108,8 @@ static int StartDebugSignalHandler() {
   CHECK_EQ(0, pthread_sigmask(SIG_SETMASK, &sigmask, nullptr));
   CHECK_EQ(0, pthread_attr_destroy(&attr));
   if (err != 0) {
-    fprintf(stderr, "node[%d]: pthread_create: %s\n", getpid(), strerror(err));
+    fprintf(stderr, "node[%u]: pthread_create: %s\n",
+            GetProcessId(), strerror(err));
     fflush(stderr);
     // Leave SIGUSR1 blocked.  We don't install a signal handler,
     // receiving the signal would terminate the process.

src/node.cc

@@ -99,7 +99,6 @@
 #if defined(_MSC_VER)
 #include <direct.h>
 #include <io.h>
-#define getpid GetCurrentProcessId
 #define umask _umask
 typedef int mode_t;
 #else
@@ -1659,13 +1658,8 @@ NO_RETURN void Assert(const char* const (*args)[4]) {
   if (uv_exepath(exepath, &exepath_size))
     snprintf(exepath, sizeof(exepath), "node");
 
-  char pid[12] = {0};
-#ifndef _WIN32
-  snprintf(pid, sizeof(pid), "[%u]", getpid());
-#endif
-
-  fprintf(stderr, "%s%s: %s:%s:%s%s Assertion `%s' failed.\n",
-          exepath, pid, filename, linenum,
+  fprintf(stderr, "%s[%u]: %s:%s:%s%s Assertion `%s' failed.\n",
+          exepath, GetProcessId(), filename, linenum,
           function, *function ? ":" : "", message);
   fflush(stderr);
 
@@ -3197,7 +3191,8 @@ void SetupProcessObject(Environment* env,
       process_env_template->NewInstance(env->context()).ToLocalChecked();
   process->Set(FIXED_ONE_BYTE_STRING(env->isolate(), "env"), process_env);
 
-  READONLY_PROPERTY(process, "pid", Integer::New(env->isolate(), getpid()));
+  READONLY_PROPERTY(process, "pid",
+                    Integer::New(env->isolate(), GetProcessId()));
   READONLY_PROPERTY(process, "features", GetFeatures(env));
 
   CHECK(process->SetAccessor(env->context(),

src/node_internals.h

@@ -248,6 +248,7 @@ void RegisterSignalHandler(int signal,
                            bool reset_handler = false);
 #endif
 
+uint32_t GetProcessId();
 bool SafeGetenv(const char* key, std::string* text);
 
 template <typename T, size_t N>

src/util.cc

@@ -24,6 +24,14 @@
 #include "node_internals.h"
 #include <stdio.h>
 
+#ifdef __POSIX__
+#include <unistd.h>  // getpid()
+#endif
+
+#ifdef _MSC_VER
+#include <windows.h>  // GetCurrentProcessId()
+#endif
+
 namespace node {
 
 using v8::Isolate;
@@ -105,4 +113,12 @@ void LowMemoryNotification() {
   }
 }
 
+uint32_t GetProcessId() {
+#ifdef _WIN32
+  return GetCurrentProcessId();
+#else
+  return getpid();
+#endif
+}
+
 }  // namespace node