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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph distributed storage system
*
* Copyright (C) 2015 Mirantis Inc
*
* Author: Mykola Golub <mgolub@mirantis.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
*/
#ifndef SUB_PROCESS_H
#define SUB_PROCESS_H
#if defined(__FreeBSD__) || defined(__APPLE__)
#include <signal.h>
#endif
#include <sys/wait.h>
#include <sstream>
#include <vector>
/**
* SubProcess:
* A helper class to spawn a subprocess.
*
* Example:
*
* SubProcess cat("cat", SubProcess::PIPE, SubProcess::PIPE);
* if (cat.spawn() != 0) {
* std::cerr << "cat failed: " << cat.err() << std::endl;
* return false;
* }
* write_to_fd(cat.get_stdout(), "hello world!\n");
* cat.close_stdout();
* read_from_fd(cat.get_stdin(), buf);
* if (cat.join() != 0) {
* std::cerr << cat.err() << std::endl;
* return false;
* }
*/
class SubProcess {
public:
enum std_fd_op{
KEEP,
CLOSE,
PIPE
};
public:
SubProcess(const char *cmd,
std_fd_op stdin_op = CLOSE,
std_fd_op stdout_op = CLOSE,
std_fd_op stderr_op = CLOSE);
virtual ~SubProcess();
void add_cmd_args(const char *arg, ...);
void add_cmd_arg(const char *arg);
virtual int spawn(); // Returns 0 on success or -errno on failure.
virtual int join(); // Returns exit code (0 on success).
bool is_spawned() const { return pid > 0; }
int get_stdin() const;
int get_stdout() const;
int get_stderr() const;
void close_stdin();
void close_stdout();
void close_stderr();
void kill(int signo = SIGTERM) const;
const std::string err() const;
protected:
bool is_child() const { return pid == 0; }
virtual void exec();
private:
void close(int &fd);
protected:
std::string cmd;
std::vector<std::string> cmd_args;
std_fd_op stdin_op;
std_fd_op stdout_op;
std_fd_op stderr_op;
int stdin_pipe_out_fd;
int stdout_pipe_in_fd;
int stderr_pipe_in_fd;
int pid;
std::ostringstream errstr;
};
class SubProcessTimed : public SubProcess {
public:
SubProcessTimed(const char *cmd, std_fd_op stdin_op = CLOSE,
std_fd_op stdout_op = CLOSE, std_fd_op stderr_op = CLOSE,
int timeout = 0, int sigkill = SIGKILL);
protected:
void exec() override;
private:
int timeout;
int sigkill;
};
void timeout_sighandler(int sig);
#endif
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