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// Copyright 2012 Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of Google Inc. nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "utils/signals/interrupts.hpp"
extern "C" {
#include <signal.h>
#include <unistd.h>
}
#include <cstdlib>
#include <atf-c++.hpp>
#include "utils/format/macros.hpp"
#include "utils/process/child.ipp"
#include "utils/process/status.hpp"
#include "utils/signals/exceptions.hpp"
#include "utils/signals/programmer.hpp"
namespace process = utils::process;
namespace signals = utils::signals;
namespace {
/// Set to the signal that fired; -1 if none.
static volatile int fired_signal = -1;
/// Test handler for signals.
///
/// \post fired_signal is set to the signal that triggered the handler.
///
/// \param signo The signal that triggered the handler.
static void
signal_handler(const int signo)
{
fired_signal = signo;
}
/// Child process that pauses waiting to be killed.
static void
pause_child(void)
{
sigset_t mask;
sigemptyset(&mask);
if (sigsuspend(&mask) == -1)
::exit(EXIT_FAILURE);
else {
// If this happens, it is because we received a non-deadly signal and
// the execution resumed. This is not what we expect, so exit with an
// arbitrary code.
::exit(45);
}
}
/// Checks that interrupts_handler() handles a particular signal.
///
/// This indirectly checks the check_interrupt() function, which is not part of
/// the class but is tightly related.
///
/// \param signo The signal to check.
static void
check_interrupts_handler(const int signo)
{
signals::programmer test_handler(signo, signal_handler);
{
signals::interrupts_handler interrupts;
signals::check_interrupt();
::kill(getpid(), signo);
ATF_REQUIRE_THROW_RE(signals::interrupted_error,
F("Interrupted by signal %s") % signo,
signals::check_interrupt());
}
ATF_REQUIRE_EQ(-1, fired_signal);
::kill(getpid(), signo);
ATF_REQUIRE_EQ(signo, fired_signal);
test_handler.unprogram();
}
/// Checks that interrupts_inhibiter() handles a particular signal.
///
/// \param signo The signal to check.
static void
check_interrupts_inhibiter(const int signo)
{
signals::programmer test_handler(signo, signal_handler);
{
signals::interrupts_inhibiter inhibiter;
::kill(::getpid(), signo);
ATF_REQUIRE_EQ(-1, fired_signal);
}
ATF_REQUIRE_EQ(signo, fired_signal);
test_handler.unprogram();
}
} // anonymous namespace
ATF_TEST_CASE_WITHOUT_HEAD(interrupts_handler__sighup);
ATF_TEST_CASE_BODY(interrupts_handler__sighup)
{
check_interrupts_handler(SIGHUP);
}
ATF_TEST_CASE_WITHOUT_HEAD(interrupts_handler__sigint);
ATF_TEST_CASE_BODY(interrupts_handler__sigint)
{
check_interrupts_handler(SIGINT);
}
ATF_TEST_CASE_WITHOUT_HEAD(interrupts_handler__sigterm);
ATF_TEST_CASE_BODY(interrupts_handler__sigterm)
{
check_interrupts_handler(SIGTERM);
}
ATF_TEST_CASE_WITHOUT_HEAD(interrupts_handler__kill_children);
ATF_TEST_CASE_BODY(interrupts_handler__kill_children)
{
std::auto_ptr< process::child > child1(process::child::fork_capture(
pause_child));
std::auto_ptr< process::child > child2(process::child::fork_capture(
pause_child));
signals::interrupts_handler interrupts;
// Our children pause until the reception of a signal. Interrupting
// ourselves will cause the signal to be re-delivered to our children due to
// the interrupts_handler semantics. If this does not happen, the wait
// calls below would block indefinitely and cause our test to time out.
::kill(::getpid(), SIGHUP);
const process::status status1 = child1->wait();
ATF_REQUIRE(status1.signaled());
ATF_REQUIRE_EQ(SIGHUP, status1.termsig());
const process::status status2 = child2->wait();
ATF_REQUIRE(status2.signaled());
ATF_REQUIRE_EQ(SIGHUP, status2.termsig());
}
ATF_TEST_CASE_WITHOUT_HEAD(interrupts_inhibiter__sighup);
ATF_TEST_CASE_BODY(interrupts_inhibiter__sighup)
{
check_interrupts_inhibiter(SIGHUP);
}
ATF_TEST_CASE_WITHOUT_HEAD(interrupts_inhibiter__sigint);
ATF_TEST_CASE_BODY(interrupts_inhibiter__sigint)
{
check_interrupts_inhibiter(SIGINT);
}
ATF_TEST_CASE_WITHOUT_HEAD(interrupts_inhibiter__sigterm);
ATF_TEST_CASE_BODY(interrupts_inhibiter__sigterm)
{
check_interrupts_inhibiter(SIGTERM);
}
ATF_INIT_TEST_CASES(tcs)
{
ATF_ADD_TEST_CASE(tcs, interrupts_handler__sighup);
ATF_ADD_TEST_CASE(tcs, interrupts_handler__sigint);
ATF_ADD_TEST_CASE(tcs, interrupts_handler__sigterm);
ATF_ADD_TEST_CASE(tcs, interrupts_handler__kill_children);
ATF_ADD_TEST_CASE(tcs, interrupts_inhibiter__sighup);
ATF_ADD_TEST_CASE(tcs, interrupts_inhibiter__sigint);
ATF_ADD_TEST_CASE(tcs, interrupts_inhibiter__sigterm);
}
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