uutils.h

/*
 * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All Rights Reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */
 
#ifndef _GREENSOCS_BASE_COMPONENTS_UUTILS
#define _GREENSOCS_BASE_COMPONENTS_UUTILS
 
#ifndef WIN32
 
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <csignal>
#include <signal.h>
#include <cstdlib>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <poll.h>
#include <sys/wait.h>
#include <cassert>
#include <iostream>
#include <thread>
#include <map>
#include <utility>
#include <functional>
#include <vector>
#include <atomic>
#include <systemc>
#include <unordered_map>
#include <scp/report.h>
#include <mutex>
 
namespace gs {
 
class SigHandler : public sc_core::sc_prim_channel
{
public:
    static SigHandler& get();
 
    enum class Handler_CB {
        EXIT,       //  run signal_handler then exit
        PASS,       // run signal_handler
        FORCE_EXIT, // just exit
        IGN,        // ignore
        DFL,        // default
    };
 
    static void pass_sig_handler(int sig);
 
    static void force_exit_sig_handler(int sig);
 
    void add_sig_handler(int signum, Handler_CB s_cb);
 
    template <typename CONT_TYPE>
    void register_cb(const std::string& name, std::unordered_map<std::string, std::function<CONT_TYPE>>& container,
                     const std::function<CONT_TYPE>& cb, const std::string& type_of_cb);
 
    template <typename CONT_TYPE>
    void deregister_cb(const std::string& name, std::unordered_map<std::string, std::function<CONT_TYPE>>& container,
                       const std::string& type_of_cb);
 
    void register_on_exit_cb(const std::string& name, const std::function<void()>& cb);
 
    void deregister_on_exit_cb(const std::string& name);
 
    void add_to_block_set(int signum);
 
    void reset_block_set();
 
    void block_signal_set();
 
    void set_nosig_chld_stop();
 
    void block_curr_handled_signals();
 
    void register_handler(const std::string& name, const std::function<void(int)>& handler);
 
    void deregister_handler(const std::string& name);
 
    int get_write_sock_end();
 
    void set_sig_num(int val);
 
    void mark_error_signal(int signum, std::string error_msg);
 
    ~SigHandler();
 
    void end_of_simulation();
 
private:
    void _start_pass_signal_handler();
 
    void update();
 
    SigHandler();
 
    SigHandler(const SigHandler&) = delete;
    SigHandler& operator()(const SigHandler&) = delete;
 
    void _update_sig_cb(int signum, Handler_CB s_cb);
 
    void _update_all_sigs_cb();
 
    void _change_sig_cbs_to_dfl();
 
private:
    std::map<int, Handler_CB> m_signals;
    std::map<int, std::string> error_signals;
    sigset_t m_sigs_to_block;
    struct pollfd self_pipe_monitor;
    std::thread pass_handler;
    std::unordered_map<std::string, std::function<void(int)>> handlers;
    std::unordered_map<std::string, std::function<void()>> exit_handlers;
    std::atomic_bool is_pass_handler_requested;
    std::atomic_bool stop_running;
    std::atomic_int32_t sig_num;
    int self_sockpair_fd[2];
    struct sigaction exit_act;
    struct sigaction pass_act;
    struct sigaction force_exit_act;
    struct sigaction ign_act;
    struct sigaction dfl_act;
    std::mutex cb_mutex;
    std::mutex thread_start_mutex;
    std::mutex signals_mutex;
};
 
class ProcAliveHandler
{
public:
    ProcAliveHandler();
 
    ~ProcAliveHandler();
 
    void wait_child(pid_t cpid);
 
    void recv_sockpair_fds_from_remote(int fd0, int fd1);
 
    int get_sockpair_fd0() const;
 
    int get_sockpair_fd1() const;
 
    pid_t get_ppid() const;
 
    void init_peer_conn_checker();
 
    void setup_parent_conn_checker();
 
    void check_parent_conn_sth(std::function<void()> on_parent_exit);
 
    void check_parent_conn_nth(std::function<void()> on_parent_exit);
 
private:
    void _set_ppid();
 
private:
    std::atomic_bool stop_running;
    pid_t m_ppid;
    std::thread child_waiter;
    std::thread parent_alive_checker;
    int m_sock_pair_fds[2];
    bool m_is_ppid_set;
    bool m_is_parent_setup_called;
};
 
} // namespace gs
 
#endif // WIN32
 
#endif // _GREENSOCS_BASE_COMPONENTS_UUTILS