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// Copyright (c) 2021 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <fs.h>
#include <ipc/process.h>
#include <ipc/protocol.h>
#include <mp/util.h>
#include <tinyformat.h>
#include <util/strencodings.h>
#include <cstdint>
#include <exception>
#include <iostream>
#include <stdexcept>
#include <stdlib.h>
#include <string.h>
#include <system_error>
#include <unistd.h>
#include <utility>
#include <vector>
namespace ipc {
namespace {
class ProcessImpl : public Process
{
public:
int spawn(const std::string& new_exe_name, const fs::path& argv0_path, int& pid) override
{
return mp::SpawnProcess(pid, [&](int fd) {
fs::path path = argv0_path;
path.remove_filename();
path.append(new_exe_name);
return std::vector<std::string>{path.string(), "-ipcfd", strprintf("%i", fd)};
});
}
int waitSpawned(int pid) override { return mp::WaitProcess(pid); }
bool checkSpawned(int argc, char* argv[], int& fd) override
{
// If this process was not started with a single -ipcfd argument, it is
// not a process spawned by the spawn() call above, so return false and
// do not try to serve requests.
if (argc != 3 || strcmp(argv[1], "-ipcfd") != 0) {
return false;
}
// If a single -ipcfd argument was provided, return true and get the
// file descriptor so Protocol::serve() can be called to handle
// requests from the parent process. The -ipcfd argument is not valid
// in combination with other arguments because the parent process
// should be able to control the child process through the IPC protocol
// without passing information out of band.
if (!ParseInt32(argv[2], &fd)) {
throw std::runtime_error(strprintf("Invalid -ipcfd number '%s'", argv[2]));
}
return true;
}
};
} // namespace
std::unique_ptr<Process> MakeProcess() { return std::make_unique<ProcessImpl>(); }
} // namespace ipc
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