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annotate libinterp/corefcn/oct-process.cc @ 27002:c04329ead503

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new class for executing commands and getting result * oct-process.h, oct-process.cc: New files. * libinterp/corefcn/module.mk: Update.
author Andrew Janke <andrew@apjanke.net>
date Fri, 11 Jan 2019 21:24:26 -0500
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children 84ff9953faa1
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27002
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1 /*
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2
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3 Copyright (C) 2019 Andrew Janke
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4
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5 This file is part of Octave.
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6
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7 Octave is free software: you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by
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9 the Free Software Foundation, either version 3 of the License, or
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10 (at your option) any later version.
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11
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12 Octave is distributed in the hope that it will be useful, but
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13 WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <https://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #include <iostream>
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24 #include <sstream>
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25
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26 #include "oct-process.h"
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27 #include "procstream.h"
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28 #include "sysdep.h"
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29 #include "oct-syscalls.h"
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30
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31 namespace octave
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32 {
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33 OCTINTERP_API
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34 process_execution_result
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35 process_execution_result::of_success (int exit_status,
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36 const std::string& stdout_output)
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37 {
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38 return process_execution_result (0, exit_status, stdout_output, "");
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39 }
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40
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41 OCTINTERP_API
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42 process_execution_result
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43 process_execution_result::of_error (int status, const std::string& err_msg)
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44 {
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45 return process_execution_result (status, -1, "", err_msg);
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46 }
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47
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48 // Execute a shell command, returning results as a C++ object
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49 OCTINTERP_API
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50 process_execution_result
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51 run_command_and_return_output (const std::string& cmd_str)
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52 {
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53 iprocstream cmd (cmd_str.c_str ());
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54
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55 if (! cmd)
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56 {
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57 std::string msg = "unable to start subprocess for '" + cmd_str + "'";
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58
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59 return process_execution_result::of_error (-1, msg);
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60 }
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61
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62 std::ostringstream output_buf;
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63
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64 char ch;
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65
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66 for (;;)
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67 {
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68 if (cmd.get (ch))
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69 output_buf.put (ch);
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70 else
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71 {
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72 if (! cmd.eof () && errno == EAGAIN)
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73 cmd.clear ();
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74 else
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75 break;
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76 }
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77 }
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78
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79 int cmd_status = cmd.close ();
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80
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81 if (octave::sys::wifexited (cmd_status))
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82 cmd_status = octave::sys::wexitstatus (cmd_status);
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83 else
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84 cmd_status = 127;
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85
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86 return process_execution_result::of_success (cmd_status, output_buf.str ());
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87 }
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88 }