feat: add Process.pid and Process.ppid foreign static methods to os module

Implement uv_os_getpid() and uv_os_getppid() bindings in process.c, register them in the CLI module table, expose as foreign statics in os.wren, and add a test suite verifying both return positive integers with pid greater than ppid.

src/cli/modules.c

@@ -25,8 +25,10 @@ extern void fileWriteBytes(WrenVM* vm);
 extern void platformIsPosix(WrenVM* vm);
 extern void platformName(WrenVM* vm);
 extern void processAllArguments(WrenVM* vm);
-extern void processVersion(WrenVM* vm);
 extern void processCwd(WrenVM* vm);
+extern void processPid(WrenVM* vm);
+extern void processPpid(WrenVM* vm);
+extern void processVersion(WrenVM* vm);
 extern void statPath(WrenVM* vm);
 extern void statBlockCount(WrenVM* vm);
 extern void statBlockSize(WrenVM* vm);
@@ -168,8 +170,10 @@ static ModuleRegistry modules[] =
     END_CLASS
     CLASS(Process)
       STATIC_METHOD("allArguments", processAllArguments)
-      STATIC_METHOD("version", processVersion)
       STATIC_METHOD("cwd", processCwd)
+      STATIC_METHOD("pid", processPid)
+      STATIC_METHOD("ppid", processPpid)
+      STATIC_METHOD("version", processVersion)
     END_CLASS
   END_MODULE
   MODULE(repl)

src/module/os.c

@@ -71,12 +71,6 @@ void processAllArguments(WrenVM* vm)
   }
 }
 
-
-void processVersion(WrenVM* vm) {
-  wrenEnsureSlots(vm, 1);
-  wrenSetSlotString(vm, 0, WREN_VERSION_STRING);
-}
-
 void processCwd(WrenVM* vm)
 {
   wrenEnsureSlots(vm, 1);
@@ -92,3 +86,18 @@ void processCwd(WrenVM* vm)
 
   wrenSetSlotString(vm, 0, buffer);
 }
+
+void processPid(WrenVM* vm) {
+  wrenEnsureSlots(vm, 1);
+  wrenSetSlotDouble(vm, 0, uv_os_getpid());
+}
+
+void processPpid(WrenVM* vm) {
+  wrenEnsureSlots(vm, 1);
+  wrenSetSlotDouble(vm, 0, uv_os_getppid());
+}
+
+void processVersion(WrenVM* vm) {
+  wrenEnsureSlots(vm, 1);
+  wrenSetSlotString(vm, 0, WREN_VERSION_STRING);
+}

src/module/os.wren

@@ -10,6 +10,8 @@ class Process {
   static arguments { allArguments.count >= 2 ? allArguments[2..-1] : [] }
 
   foreign static allArguments
-  foreign static version
   foreign static cwd
+  foreign static pid
+  foreign static ppid
+  foreign static version
 }

src/module/os.wren.inc

@@ -14,6 +14,8 @@ static const char* osModuleSource =
 "  static arguments { allArguments.count >= 2 ? allArguments[2..-1] : [] }\n"
 "\n"
 "  foreign static allArguments\n"
-"  foreign static version\n"
 "  foreign static cwd\n"
+"  foreign static pid\n"
+"  foreign static ppid\n"
+"  foreign static version\n"
 "}\n";

test/os/process/pid_and_ppid.wren

@@ -0,0 +1,11 @@
+import "os" for Process
+
+System.print(Process.pid is Num) // expect: true
+System.print(Process.pid.isInteger) // expect: true
+System.print(Process.pid > 0) // expect: true
+
+System.print(Process.ppid is Num) // expect: true
+System.print(Process.ppid.isInteger) // expect: true
+System.print(Process.ppid > 0) // expect: true
+
+System.print(Process.pid > Process.ppid) // expect: true