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// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <sched.h>
#include <unistd.h>
#include <csignal>
#include <cstdint>
constexpr int kProcesses = 512;
constexpr int kThreads = 1;
constexpr int kSenders = 1;
constexpr int kStackSize = 4096;
pid_t g_pids[kProcesses];
uint8_t g_stacks[kThreads][kStackSize] __attribute__((aligned(4096)));
constexpr int kSignals[] = {
SIGPROF,
};
void SignalHandler(int) {}
int ChildFunc(void*) {
for (;;) {
sleep(10);
}
}
int main() {
for (int i = 0; i < kProcesses; ++i) {
int p[2] = {0, 0};
char c = ' ';
pipe(p);
g_pids[i] = fork();
if (g_pids[i] == 0) {
for (int sig : kSignals) {
signal(sig, SignalHandler);
}
for (int j = 0; j < kThreads; ++j) {
int flags = CLONE_FILES | CLONE_FS | CLONE_IO | CLONE_PARENT |
CLONE_SIGHAND | CLONE_THREAD | CLONE_VM;
clone(&ChildFunc, g_stacks[j + 1], flags, nullptr, nullptr, nullptr,
nullptr);
}
close(p[0]);
write(p[1], &c, 1);
close(p[1]);
for (;;) {
sleep(10);
}
}
read(p[0], &c, 1);
}
for (int i = 0; i < kSenders; ++i) {
if (fork() == 0) {
break;
}
}
for (;;) {
for (int sig : kSignals) {
for (int pid : g_pids) {
kill(pid, sig);
}
}
}
}
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