Fix readahead test for opensource.

Skip InvalidOffset and InvalidLength for Linux as the test is invalid for
later Kernel versions.

Add UnsupportedFile test as this check is in all kernel versions.

PiperOrigin-RevId: 327248035

test/syscalls/linux/BUILD

@@ -1862,6 +1862,7 @@ cc_binary(
     srcs = ["readahead.cc"],
     linkstatic = 1,
     deps = [
+        ":socket_test_util",
         "//test/util:file_descriptor",
         gtest,
         "//test/util:temp_path",

test/syscalls/linux/readahead.cc

@@ -16,6 +16,7 @@
 #include <fcntl.h>
 
 #include "gtest/gtest.h"
+#include "test/syscalls/linux/socket_test_util.h"
 #include "test/util/file_descriptor.h"
 #include "test/util/temp_path.h"
 #include "test/util/test_util.h"
@@ -29,7 +30,15 @@ TEST(ReadaheadTest, InvalidFD) {
   EXPECT_THAT(readahead(-1, 1, 1), SyscallFailsWithErrno(EBADF));
 }
 
+TEST(ReadaheadTest, UnsupportedFile) {
+  FileDescriptor sock =
+      ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_UNIX, SOCK_STREAM, 0));
+  ASSERT_THAT(readahead(sock.get(), 1, 1), SyscallFailsWithErrno(EINVAL));
+}
+
 TEST(ReadaheadTest, InvalidOffset) {
+  // This test is not valid for some Linux Kernels.
+  SKIP_IF(!IsRunningOnGvisor());
   const TempPath in_file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
   const FileDescriptor fd =
       ASSERT_NO_ERRNO_AND_VALUE(Open(in_file.path(), O_RDWR));
@@ -79,6 +88,8 @@ TEST(ReadaheadTest, WriteOnly) {
 }
 
 TEST(ReadaheadTest, InvalidSize) {
+  // This test is not valid on some Linux kernels.
+  SKIP_IF(!IsRunningOnGvisor());
   const TempPath in_file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
   const FileDescriptor fd =
       ASSERT_NO_ERRNO_AND_VALUE(Open(in_file.path(), O_RDWR));