Pass arguments to main via runtime.process.Init, dispatched on signature

system/services/args-echo/args-echo.zig

@@ -21,8 +21,8 @@ fn burnStack(depth: usize) u8 {
     return touch[0] +% burnStack(depth - 1);
 }
 
-pub fn main() void {
-    if (runtime.argumentCount() <= 1) {
+pub fn main(init: runtime.process.Init) void {
+    if (init.arguments.count <= 1) {
         // First instance: spawn the second with real arguments, then exit.
         _ = runtime.system.spawnWithArguments("args-echo", &.{ "alpha", "beta-42" });
         return;
@@ -36,8 +36,8 @@ pub fn main() void {
     const prefix = "args:";
     @memcpy(buffer[0..prefix.len], prefix);
     var len: usize = prefix.len;
-    for (0..runtime.argumentCount()) |i| {
-        const argument = runtime.argument(i);
+    var iterator = init.arguments.iterate();
+    while (iterator.next()) |argument| {
         if (len + 1 + argument.len + 1 > buffer.len) break;
         buffer[len] = ' ';
         len += 1;

system/services/process-test/process-test.zig

@@ -48,10 +48,8 @@ fn awaitChildExit(endpoint: runtime.ipc.Handle) u32 {
     return received.childProcessId();
 }
 
-pub fn main() void {
-    if (runtime.argumentCount() <= 1) return; // spawned bare (ramdisk sweep): stay silent
-
-    const role = runtime.argument(1);
+pub fn main(init: runtime.process.Init) void {
+    const role = init.arguments.get(1) orelse return; // spawned bare (ramdisk sweep): stay silent
     if (std.mem.eql(u8, role, "sleeper")) {
         while (true) runtime.system.sleep(500);
     }