blob: 4bed39fbd8471c284a6686bf24a11dd0af3ae529 [file] [log] [blame]
// Copyright 2022 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stdio.h>
#include <string.h>
#include <sys/wait.h>
#include <unistd.h>
#include <perftest/perftest.h>
#include "main.h"
#include "src/lib/files/path.h"
namespace {
// Measure the time taken to launch (and then wait for) a process that
// simply exits, where the process is launched using fork+exec.
// Note that the time taken by fork() may tend to depend on the size
// of the address space of the parent process (i.e. the number of
// mappings), because fork() takes a snapshot of that address space.
bool SpawnTest(perftest::RepeatState* state) {
std::string parent_dir = files::GetDirectoryName(argv0);
std::string executable = files::JoinPath(parent_dir, "no_op_executable");
const char* executable_str = executable.c_str();
const char* argv[] = {executable_str, nullptr};
while (state->KeepRunning()) {
int pid = fork();
ZX_ASSERT(pid >= 0);
if (pid == 0) {
// In child process.
execv(executable_str, const_cast<char**>(argv));
fprintf(stderr, "exec failed: %s: %s\n", executable_str, strerror(errno));
// In parent process.
int status = 0;
int pid2 = waitpid(pid, &status, 0);
ZX_ASSERT(pid2 >= 0);
ZX_ASSERT(pid2 == pid);
return true;
void RegisterTests() { perftest::RegisterTest("ProcessSpawn", SpawnTest); }
} // namespace