// Copyright 2010 Google Inc.
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//
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#include "utils/signals/misc.hpp"

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

#include <cstdlib>

#include <atf-c++.hpp>

#include "utils/defs.hpp"
#include "utils/fs/path.hpp"
#include "utils/process/child.ipp"
#include "utils/signals/exceptions.hpp"

namespace fs = utils::fs;
namespace process = utils::process;
namespace signals = utils::signals;


namespace {


static void program_reset_raise(void) UTILS_NORETURN;


/// Body of a subprocess that tests the signal::reset function.
///
/// This function programs a signal to be ignored, then uses signal::reset to
/// bring it back to its default handler and then delivers the signal to self.
/// The default behavior of the signal is for the process to die, so this
/// function should never return correctly (and thus the child process should
/// always die due to a signal if all goes well).
static void
program_reset_raise(void)
{
    struct ::sigaction sa;
    sa.sa_handler = SIG_IGN;
    sigemptyset(&sa.sa_mask);
    sa.sa_flags = 0;
    if (::sigaction(SIGUSR1, &sa, NULL) == -1)
        std::exit(EXIT_FAILURE);

    signals::reset(SIGUSR1);
    ::kill(::getpid(), SIGUSR1);

    // Should not be reached, but we do not assert this condition because we
    // want to exit cleanly if the signal does not abort our execution to let
    // the parent easily know what happened.
    std::exit(EXIT_SUCCESS);
}


}  // anonymous namespace


ATF_TEST_CASE_WITHOUT_HEAD(reset__ok);
ATF_TEST_CASE_BODY(reset__ok)
{
    // TODO(jmmv): We should have a child type that inherits both stdout and
    // stderr so that we do not have to specify files.
    std::auto_ptr< process::child > child = process::child::fork_files(
        program_reset_raise, fs::path("stdout.txt"), fs::path("stderr.txt"));
    process::status status = child->wait();
    ATF_REQUIRE(status.signaled());
    ATF_REQUIRE_EQ(SIGUSR1, status.termsig());
}


ATF_TEST_CASE_WITHOUT_HEAD(reset__invalid);
ATF_TEST_CASE_BODY(reset__invalid)
{
    ATF_REQUIRE_THROW(signals::system_error, signals::reset(-1));
}


ATF_INIT_TEST_CASES(tcs)
{
    ATF_ADD_TEST_CASE(tcs, reset__ok);
    ATF_ADD_TEST_CASE(tcs, reset__invalid);
}