exec.h
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1 /*
2  * Copyright (C) 2011 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_POSIX_EXEC_H
30 #define CXXTOOLS_POSIX_EXEC_H
31 
32 #include <cxxtools/systemerror.h>
33 #include <vector>
34 #include <string>
35 #include <unistd.h>
36 
37 namespace cxxtools
38 {
39  namespace posix
40  {
52  class Exec
53  {
54  std::vector<std::string> _args;
55 
56  public:
57  explicit Exec(const std::string& cmd)
58  {
59  _args.push_back(cmd);
60  }
61 
62  Exec& push_back(const std::string& arg)
63  {
64  _args.push_back(arg);
65  return *this;
66  }
67 
68  // nice alias of push_back
69  Exec& arg(const std::string& arg)
70  { return push_back(arg); }
71 
72  void exec()
73  {
74  std::vector<const char*> argv;
75  for (unsigned n = 0; n < _args.size(); ++n)
76  argv.push_back(_args[n].c_str());
77  argv.push_back(0);
78  ::execvp(argv[0], (char**)&argv[0]);
79  throw SystemError("execvp");
80  }
81 
82  };
83  }
84 }
85 
86 #endif