Linux Sandbox: add test for one argument system calls.

sandbox/linux/seccomp-bpf/syscall_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <asm/unistd.h>
 #include <fcntl.h>
 #include <sys/mman.h>
 #include <unistd.h>
 
 #include "base/posix/eintr_wrapper.h"
@@ skipping 36 matching lines @@
 #else
   #warning Incomplete test case; need port for target platform
 #endif
 }
 
 TEST(Syscall, TrivialSyscallNoArgs) {
   // Test that we can do basic system calls
   EXPECT_EQ(SandboxSyscall(__NR_getpid), syscall(__NR_getpid));
 }
 
+TEST(Syscall, TrivialSyscallOneArg) {
+  int new_fd;
+  // Duplicate standard error and close it.
+  ASSERT_GE(new_fd = SandboxSyscall(__NR_dup, 2), 0);
+  int close_return_value = HANDLE_EINTR(SandboxSyscall(__NR_close, new_fd));
+  ASSERT_EQ(close_return_value, 0);
+}
+
 TEST(Syscall, ComplexSyscallSixArgs) {
   int fd;
   ASSERT_LE(0, fd = SandboxSyscall(__NR_open, "/dev/null", O_RDWR, 0L));
 
   // Use mmap() to allocate some read-only memory
   char *addr0;
   ASSERT_NE((char *)NULL,
             addr0 = reinterpret_cast<char *>(
               SandboxSyscall(kMMapNr, (void *)NULL, 4096, PROT_READ,
                              MAP_PRIVATE|MAP_ANONYMOUS, fd, 0L)));
@@ skipping 37 matching lines @@
   EXPECT_EQ(8192, SandboxSyscall(__NR_read, fd, buf, 8192L));
   EXPECT_EQ(0, memcmp(addr2, buf, 8192));
 
   // Clean up
   EXPECT_EQ(0, SandboxSyscall(__NR_munmap, addr2, 8192L));
   EXPECT_EQ(0, SandboxSyscall(__NR_munmap, addr3, 4096L));
   EXPECT_EQ(0, HANDLE_EINTR(SandboxSyscall(__NR_close, fd)));
 }
 
 } // namespace