//
// Automated Testing Framework (atf)
//
// Copyright (c) 2008 The NetBSD Foundation, 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:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. 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.
//
// THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
//

extern "C" {
#include <sys/types.h>
#include <signal.h>
#include <unistd.h>
}

#include <cerrno>
#include <cstdlib>
#include <iostream>

#include <atf-c++.hpp>

#include "exceptions.hpp"
#include "process.hpp"
#include "signals.hpp"

// ------------------------------------------------------------------------
// Auxiliary functions.
// ------------------------------------------------------------------------

namespace sigusr1 {
   static bool happened = false;

   static
   void
   handler(int signo __attribute__((__unused__)))
   {
       happened = true;
   }

   static
   void
   program(void)
   {
       struct sigaction sa;
       sa.sa_handler = handler;
       sigemptyset(&sa.sa_mask);
       sa.sa_flags = 0;
       if (::sigaction(SIGUSR1, &sa, NULL) == -1)
           throw tools::system_error("sigusr1::program",
                                   "sigaction(2) failed", errno);
   }
} // namespace sigusr1

namespace sigusr1_2 {
   static bool happened = false;

   static
   void
   handler(int signo __attribute__((__unused__)))
   {
       happened = true;
   }
} // namespace sigusr1_2

// ------------------------------------------------------------------------
// Tests for the "signal_holder" class.
// ------------------------------------------------------------------------

ATF_TEST_CASE(signal_holder_preserve);
ATF_TEST_CASE_HEAD(signal_holder_preserve)
{
   set_md_var("descr", "Tests that signal_holder preserves the original "
              "signal handler and restores it upon destruction");
}
ATF_TEST_CASE_BODY(signal_holder_preserve)
{
   using tools::signals::signal_holder;

   sigusr1::program();

   sigusr1::happened = false;
   ::kill(::getpid(), SIGUSR1);
   ATF_REQUIRE(sigusr1::happened);

   {
       signal_holder hld(SIGUSR1);
       ::kill(::getpid(), SIGUSR1);
   }

   sigusr1::happened = false;
   ::kill(::getpid(), SIGUSR1);
   ATF_REQUIRE(sigusr1::happened);
}

ATF_TEST_CASE(signal_holder_destructor);
ATF_TEST_CASE_HEAD(signal_holder_destructor)
{
   set_md_var("descr", "Tests that signal_holder processes a pending "
              "signal upon destruction");
}
ATF_TEST_CASE_BODY(signal_holder_destructor)
{
   using tools::signals::signal_holder;

   sigusr1::program();

   sigusr1::happened = false;
   ::kill(::getpid(), SIGUSR1);
   ATF_REQUIRE(sigusr1::happened);

   {
       signal_holder hld(SIGUSR1);

       sigusr1::happened = false;
       ::kill(::getpid(), SIGUSR1);
       ATF_REQUIRE(!sigusr1::happened);
   }
   ATF_REQUIRE(sigusr1::happened);
}

ATF_TEST_CASE(signal_holder_process);
ATF_TEST_CASE_HEAD(signal_holder_process)
{
   set_md_var("descr", "Tests that signal_holder's process method works "
              "to process a delayed signal explicitly");
}
ATF_TEST_CASE_BODY(signal_holder_process)
{
   using tools::signals::signal_holder;

   sigusr1::program();

   sigusr1::happened = false;
   ::kill(::getpid(), SIGUSR1);
   ATF_REQUIRE(sigusr1::happened);

   {
       signal_holder hld(SIGUSR1);

       sigusr1::happened = false;
       ::kill(::getpid(), SIGUSR1);
       ATF_REQUIRE(!sigusr1::happened);

       hld.process();
       ATF_REQUIRE(sigusr1::happened);

       sigusr1::happened = false;
   }
   ATF_REQUIRE(!sigusr1::happened);
}

// ------------------------------------------------------------------------
// Tests for the "signal_programmer" class.
// ------------------------------------------------------------------------

ATF_TEST_CASE(signal_programmer_program);
ATF_TEST_CASE_HEAD(signal_programmer_program)
{
   set_md_var("descr", "Tests that signal_programmer correctly installs a "
              "handler");
}
ATF_TEST_CASE_BODY(signal_programmer_program)
{
   using tools::signals::signal_programmer;

   signal_programmer sp(SIGUSR1, sigusr1_2::handler);

   sigusr1_2::happened = false;
   ::kill(::getpid(), SIGUSR1);
   ATF_REQUIRE(sigusr1_2::happened);
}

ATF_TEST_CASE(signal_programmer_preserve);
ATF_TEST_CASE_HEAD(signal_programmer_preserve)
{
   set_md_var("descr", "Tests that signal_programmer uninstalls the "
              "handler during destruction");
}
ATF_TEST_CASE_BODY(signal_programmer_preserve)
{
   using tools::signals::signal_programmer;

   sigusr1::program();
   sigusr1::happened = false;

   {
       signal_programmer sp(SIGUSR1, sigusr1_2::handler);

       sigusr1_2::happened = false;
       ::kill(::getpid(), SIGUSR1);
       ATF_REQUIRE(sigusr1_2::happened);
   }

   ATF_REQUIRE(!sigusr1::happened);
   ::kill(::getpid(), SIGUSR1);
   ATF_REQUIRE(sigusr1::happened);
}

// ------------------------------------------------------------------------
// Tests cases for the free functions.
// ------------------------------------------------------------------------

static
void
reset_child(void *v __attribute__((__unused__)))
{
   sigusr1::program();

   sigusr1::happened = false;
   tools::signals::reset(SIGUSR1);
   kill(::getpid(), SIGUSR1);

   if (sigusr1::happened) {
       std::cerr << "Signal was not resetted correctly\n";
       std::abort();
   } else {
       std::exit(EXIT_SUCCESS);
   }
}

ATF_TEST_CASE(reset);
ATF_TEST_CASE_HEAD(reset)
{
   set_md_var("descr", "Tests the reset function");
}
ATF_TEST_CASE_BODY(reset)
{
   tools::process::child c =
       tools::process::fork(reset_child, tools::process::stream_inherit(),
                          tools::process::stream_inherit(), NULL);

   const tools::process::status s = c.wait();
   ATF_REQUIRE(s.exited() || s.signaled());
   ATF_REQUIRE(!s.signaled() || s.termsig() == SIGUSR1);
}

// ------------------------------------------------------------------------
// Main.
// ------------------------------------------------------------------------

ATF_INIT_TEST_CASES(tcs)
{
   // Add the tests for the "signal_holder" class.
   ATF_ADD_TEST_CASE(tcs, signal_holder_preserve);
   ATF_ADD_TEST_CASE(tcs, signal_holder_destructor);
   ATF_ADD_TEST_CASE(tcs, signal_holder_process);

   // Add the tests for the "signal_programmer" class.
   ATF_ADD_TEST_CASE(tcs, signal_programmer_program);
   ATF_ADD_TEST_CASE(tcs, signal_programmer_preserve);

   // Add the test cases for the free functions.
   ATF_ADD_TEST_CASE(tcs, reset);
}

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