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/*
* Copyright © Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 or 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "system_performance_test.h"
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <unistd.h>
#include <string>
#include <thread>
using namespace std::literals::chrono_literals;
namespace
{
std::string mir_bin_dir()
{
char path[256];
auto len = readlink("/proc/self/exe", path, sizeof(path)-1);
if (len < 0)
len = 0;
path[len] = '\0';
if (auto slash = strrchr(path, '/'))
*slash = '\0';
return path;
}
void kill_nicely(pid_t pid)
{
if (kill(pid, SIGTERM) < 0)
return;
int const timeout = 5;
int status, count = 0;
while (0 == waitpid(pid, &status, WNOHANG) && count < timeout)
{
sleep(1);
++count;
}
kill(pid, SIGKILL);
}
int exec_cmd(char const* cmd)
{
auto buf = strdup(cmd);
size_t argc = 1;
char* argv[256] = {buf};
char *c = buf;
while (*c)
{
if (*c == ' ')
{
*c = '\0';
if (argc < (sizeof(argv)/sizeof(argv[0]) - 1))
{
argv[argc] = c + 1;
++argc;
}
}
++c;
}
argv[argc] = NULL;
return execv(argv[0], argv);
}
FILE* popen_with_pid(char const* cmd, pid_t& pid)
{
int pipefd[2];
if (pipe(pipefd))
return NULL;
int const& pipe_out = pipefd[0];
int const& pipe_in = pipefd[1];
pid = fork();
if (pid < 0)
{
close(pipe_in);
close(pipe_out);
return NULL;
}
else if (pid == 0)
{
/* Do the minimum necessary to make this work under normal circumstances.
*
* The performance tests will often be run with MIR_SERVER_LOGGING enabled,
* as *most* of them use our regular test infrastructure, which inhibits
* logging output unless MIR_SERVER_LOGGING is set.
*
* Unfortunately, this particular test does *not* use that infrastructure,
* and instead spawns mir_demo_server. Which does not understand the
* MIR_SERVER_LOGGING option, and so fails to start (as it should, when
* passed an unknown option).
*/
unsetenv("MIR_SERVER_LOGGING");
close(pipe_out);
dup2(pipe_in, 1); // Child stdout goes into pipe_in
close(pipe_in);
exec_cmd(cmd);
exit(errno);
}
else
{
close(pipe_in);
}
return fdopen(pipe_out, "r");
}
pid_t spawn(char const* cmd)
{
int pid = fork();
if (pid == 0)
{
// Silence stdout/stderr
close(1);
close(2);
exec_cmd(cmd);
exit(errno);
}
return pid;
}
pid_t spawn(std::string const& cmd)
{
return spawn(cmd.c_str());
}
bool wait_for_file(char const* path, std::chrono::seconds timeout)
{
struct stat s;
int count = 0, max = timeout.count();
int ret;
while ((ret = stat(path, &s)) < 0 && errno == ENOENT && count < max)
{
++count;
std::this_thread::sleep_for(1s);
}
return ret == 0;
}
} // anonymous namespace
namespace mir { namespace test {
SystemPerformanceTest::SystemPerformanceTest() :
bin_dir{mir_bin_dir()},
mir_sock{"mir_test_socket_" + std::to_string(getpid())}
{
env.emplace_back("WAYLAND_DISPLAY", mir_sock.c_str());
}
void SystemPerformanceTest::set_up_with(std::string const server_args)
{
auto const server_cmd = bin_dir+"/mir_demo_server "+server_args;
server_output = popen_with_pid(server_cmd.c_str(), server_pid);
ASSERT_TRUE(server_output) << server_cmd;
ASSERT_TRUE(wait_for_file((getenv("XDG_RUNTIME_DIR") + ("/" + mir_sock)).c_str(), 5s)) << server_cmd;
}
void SystemPerformanceTest::TearDown()
{
for (auto const client_pid: client_pids)
kill_nicely(client_pid);
kill_nicely(server_pid);
fclose(server_output);
}
void SystemPerformanceTest::spawn_clients(std::initializer_list<std::string> clients)
{
for (auto& client : clients)
{
client_pids.push_back(spawn(bin_dir + "/" + client));
std::this_thread::sleep_for(100ms);
}
}
void SystemPerformanceTest::run_server_for(std::chrono::seconds timeout)
{
pid_t pid = server_pid;
std::thread killer([timeout,pid]()
{
std::this_thread::sleep_for(timeout);
kill_nicely(pid);
});
killer.detach();
}
} } // namespace mir::test
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