fork.h
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1 /*
2  * Copyright (C) 2007 Tommi Maekitalo
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * As a special exception, you may use this file as part of a free
10  * software library without restriction. Specifically, if other files
11  * instantiate templates or use macros or inline functions from this
12  * file, or you compile this file and link it with other files to
13  * produce an executable, this file does not by itself cause the
14  * resulting executable to be covered by the GNU General Public
15  * License. This exception does not however invalidate any other
16  * reasons why the executable file might be covered by the GNU Library
17  * General Public License.
18  *
19  * This library is distributed in the hope that it will be useful,
20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22  * Lesser General Public License for more details.
23  *
24  * You should have received a copy of the GNU Lesser General Public
25  * License along with this library; if not, write to the Free Software
26  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27  */
28 
29 #ifndef CXXTOOLS_FORK_H
30 #define CXXTOOLS_FORK_H
31 
32 #include <sys/types.h>
33 #include <sys/wait.h>
34 #include <unistd.h>
35 #include <cxxtools/systemerror.h>
36 
37 namespace cxxtools
38 {
39  namespace posix
40  {
64  class Fork
65  {
66  Fork(const Fork&);
67  Fork& operator= (const Fork&);
68 
69  pid_t pid;
70 
71  public:
72  Fork(bool now = true)
73  : pid(0)
74  {
75  if (now)
76  fork();
77  }
78 
80  {
81  if (pid)
82  wait();
83  }
84 
85  void fork()
86  {
87  pid = ::fork();
88  if (pid < 0)
89  throw SystemError("fork");
90  }
91 
92  pid_t getPid() const { return pid; }
93  bool parent() const { return pid > 0; }
94  bool child() const { return !parent(); }
95  void setNowait() { pid = 0; }
96  int wait(int options = 0)
97  {
98  int status;
99  ::waitpid(pid, &status, options);
100  pid = 0;
101  return status;
102  }
103  };
104  }
105 }
106 
107 #endif // CXXTOOLS_FORK_H