wind: Use init --user and pledge()

base/etc/user/00-gclient

@@ -0,0 +1,3 @@
+Name=gclient
+Description=Sample user application.
+Command=/usr/bin/gclient

wind/main.cpp

@@ -7,6 +7,7 @@
 #include <os/File.h>
 #include <os/LocalServer.h>
 #include <os/Process.h>
+#include <os/Security.h>
 #include <pwd.h>
 #include <stdlib.h>
 #include <string.h>
@@ -19,6 +20,8 @@ Result<int> luna_main(int argc, char** argv)
 {
     srand((unsigned)time(NULL));
 
+    TRY(os::Security::pledge("stdio rpath wpath cpath unix proc exec tty id", NULL));
+
     StringView socket_path = "/tmp/wind.sock";
     StringView user;
 
@@ -74,8 +77,8 @@ Result<int> luna_main(int argc, char** argv)
     auto server = TRY(os::LocalServer::create(socket_path, false));
     TRY(server->listen(20));
 
-    StringView args[] = { "/usr/bin/gclient"_sv };
+    StringView args[] = { "/usr/bin/init"_sv, "--user"_sv };
-    TRY(os::Process::spawn("/usr/bin/gclient"_sv, Slice<StringView> { args, 1 }, false));
+    TRY(os::Process::spawn("/usr/bin/init"_sv, Slice<StringView> { args, 2 }, false));
 
     ui::Color background = ui::BLACK;
 
@@ -85,6 +88,8 @@ Result<int> luna_main(int argc, char** argv)
 
     Vector<os::LocalServer::Client> clients;
 
+    TRY(os::Security::pledge("stdio rpath unix", NULL));
+
     while (1)
     {
         screen.canvas().fill(background);