Kernel/LibC: add SYS_STAT and stat(), lstat()

kernel/include/kernel/Process.h

@@ -64,7 +64,7 @@ namespace Kernel
 		BAN::ErrorOr<off_t> tell(int fd);
 
 		BAN::ErrorOr<void> fstat(int fd, struct stat*);
-		BAN::ErrorOr<void> stat(BAN::StringView path, struct stat*);
+		BAN::ErrorOr<void> stat(BAN::StringView path, struct stat*, int flags);
 
 		BAN::ErrorOr<void> mount(BAN::StringView source, BAN::StringView target);
 

kernel/kernel/Process.cpp

@@ -522,9 +522,9 @@ namespace Kernel
 		return {};
 	}
 
-	BAN::ErrorOr<void> Process::stat(BAN::StringView path, struct stat* out)
+	BAN::ErrorOr<void> Process::stat(BAN::StringView path, struct stat* out, int flags)
 	{
-		int fd = TRY(open(path, O_RDONLY | O_NOFOLLOW));
+		int fd = TRY(open(path, flags));
 		auto ret = fstat(fd, out);
 		MUST(close(fd));
 		return ret;

kernel/kernel/Shell.cpp

@@ -534,7 +534,7 @@ argument_done:
 				BAN::String entry_path;
 				TRY(entry_path.append(entry_prefix));
 				TRY(entry_path.append(entry));
-				TRY(Process::current().stat(entry_path, &st));
+				TRY(Process::current().stat(entry_path, &st, O_RDONLY | O_NOFOLLOW));
 
 				Inode::Mode mode { st.st_mode };
 
@@ -577,7 +577,7 @@ argument_done:
 			}
 			
 			struct stat st;
-			TRY(Process::current().stat(arguments[1], &st));
+			TRY(Process::current().stat(arguments[1], &st, O_RDONLY | O_NOFOLLOW));
 
 			Inode::Mode mode { st.st_mode };
 

kernel/kernel/Syscall.cpp

@@ -128,6 +128,14 @@ namespace Kernel
 		return ret.value();
 	}
 
+	long sys_stat(const char* path, struct stat* buf, int flags)
+	{
+		auto ret = Process::current().stat(path, buf, flags);
+		if (ret.is_error())
+			return -ret.error().get_error_code();
+		return 0;
+	}
+
 	extern "C" long sys_fork_trampoline();
 
 	extern "C" long cpp_syscall_handler(int syscall, uintptr_t arg1, uintptr_t arg2, uintptr_t arg3, uintptr_t arg4, uintptr_t arg5)
@@ -193,6 +201,9 @@ namespace Kernel
 		case SYS_WAIT:
 			ret = sys_wait((pid_t)arg1, (int*)arg2, (int)arg3);
 			break;
+		case SYS_STAT:
+			ret = sys_stat((const char*)arg1, (struct stat*)arg2, (int)arg3);
+			break;
 		default:
 			Kernel::panic("Unknown syscall {}", syscall);
 		}

kernel/kernel/kernel.cpp

@@ -180,8 +180,8 @@ static void init2(void* tty1)
 
 	((TTY*)tty1)->initialize_device();
 
-	//MUST(Process::create_userspace("/usr/bin/test"sv));
-	//return;
+	MUST(Process::create_userspace("/usr/bin/Shell"sv));
+	return;
 
 	Process::create_kernel(
 		[](void*)