commandoutput.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_COMMANDOUTPUT_H
30 #define CXXTOOLS_POSIX_COMMANDOUTPUT_H
31 
32 #include <cxxtools/posix/exec.h>
34 #include <cxxtools/posix/fork.h>
35 
36 namespace cxxtools
37 {
38  namespace posix
39  {
59  class CommandOutput : public std::istream
60  {
61  Fork _fork;
62  Exec _exec;
63  Pipestreambuf streambuf;
64 
65  public:
66  explicit CommandOutput(const std::string& cmd, unsigned bufsize = 8192)
67  : std::istream(&streambuf),
68  _fork(false),
69  _exec(cmd),
70  streambuf(bufsize)
71  {
72  }
73 
74  void push_back(const std::string& arg)
75  { _exec.push_back(arg); }
76 
77  void run(bool combineStderr = false);
78 
79  int wait(int options = 0)
80  { return _fork.wait(options); }
81 
83  { return streambuf.in(); }
84 
85  void close()
86  { streambuf.closeReadFd(); }
87 
88  };
89 
90  }
91 }
92 
93 #endif // CXXTOOLS_POSIX_COMMANDOUTPUT_H