Reland "Non-SFI mode: Add Linux asynchronous signal support"

tests/nonsfi/nacl.scons

 # -*- python -*-
 # Copyright 2014 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 Import('env')
 
 if not env.Bit('nonsfi_nacl'):
   Return()
 
 env.AddBiasForPNaCl()
 
 nexe = env.ComponentProgram('icache_test',
                             'icache_test.cc',
                             EXTRA_LIBS=['${NONIRT_LIBS}'])
 
 node = env.CommandSelLdrTestNacl('icache_test.out', nexe)
 
 is_broken = (not env.Bit('build_arm') or env.Bit('pnacl_generate_pexe') or
              not env.Bit('tests_use_irt'))
 env.AddNodeToTestSuite(node, ['small_tests'], 'run_icache_test',
                        is_broken=is_broken)
 
+# Tests sending and receiving userspace signals. This test only works with the
+# newlib nonsfi loader.
+if env.Bit('tests_use_irt') and env.Bit('use_newlib_nonsfi_loader'):
+  nexe = env.ComponentProgram('user_async_signal_test',
+                              'user_async_signal_test.cc',
+                              EXTRA_LIBS=['${NONIRT_LIBS}'])
+  node = env.CommandSelLdrTestNacl('user_async_signal_test.out', nexe)
+  env.AddNodeToTestSuite(node, ['small_tests'], 'run_user_async_signal_test')
+
 # The subsequent tests are for syscall wrappers required by newlib
 # based non-SFI nacl_helper. The rest of NaCl does not need them.
 if env.Bit('tests_use_irt'):
   Return()
 
 nexe = env.ComponentProgram('fcntl_test',
                             'fcntl_test.cc',
                             EXTRA_LIBS=['${NONIRT_LIBS}'])
 
 node = env.CommandSelLdrTestNacl('fcntl_test.out', nexe,
@@ skipping 95 matching lines @@
 env.AddNodeToTestSuite(node, ['small_tests'], 'run_clone_test')
 
 
 nexe = env.ComponentProgram('rlimit_test',
                             'rlimit_test.cc',
                             EXTRA_LIBS=['${NONIRT_LIBS}'])
 
 node = env.CommandSelLdrTestNacl('rlimit_test.out', nexe)
 
 env.AddNodeToTestSuite(node, ['small_tests'], 'run_rlimit_test')