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src
gz-utils
include
gz
utils
Subprocess.hh
Go to the documentation of this file.
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/*
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* Copyright (C) 2023 Open Source Robotics Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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#ifndef GZ_UTILS__SUBPROCESS_HH_
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#define GZ_UTILS__SUBPROCESS_HH_
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#include "detail/subprocess.h"
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#include "
gz/utils/Environment.hh
"
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#include <iostream>
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#include <string>
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#include <vector>
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#include <utility>
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#include <gz/utils/detail/subprocess.h>
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// This header contains a wrapper to the cross-platform subprocess library.
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// It can be used to spawn processes to interact with, primarily for testing.
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namespace
gz
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{
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namespace
utils
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{
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class
Subprocess
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{
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public
:
explicit
Subprocess
(
const
std::vector<std::string>
&_commandLine):
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commandLine
(_commandLine),
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environment
({}),
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inheritEnvironment
(
true
)
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{
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this->Create();
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}
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public
:
Subprocess
(
const
std::vector<std::string>
&_commandLine,
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gz::utils::EnvironmentMap
_environment):
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commandLine
(_commandLine),
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environment
(
std
::move(_environment)),
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inheritEnvironment
(false)
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{
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this->Create();
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}
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public
:
Subprocess
(
const
std::vector<std::string>
&_commandLine,
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const
gz::utils::EnvironmentStrings
&_environment):
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Subprocess
(_commandLine,
gz
::utils::
envStringsToMap
(_environment))
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{
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}
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private
:
void
Create()
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{
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if
(this->
process
!=
nullptr
)
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return
;
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this->
process
=
new
subprocess_s;
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auto
environmentStr =
gz::utils::envMapToStrings
(this->
environment
);
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std::vector<const char*>
environmentCstr;
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std::vector<const char*>
commandLineCstr;
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for
(
const
auto
&val : this->
commandLine
)
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{
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commandLineCstr.
push_back
(val.c_str());
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}
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commandLineCstr.
push_back
(
nullptr
);
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if
(!this->
inheritEnvironment
)
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{
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for
(
const
auto
&val : environmentStr)
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{
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environmentCstr.
push_back
(val.c_str());
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}
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environmentCstr.
push_back
(
nullptr
);
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}
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int
ret = -1;
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if
(!this->
inheritEnvironment
)
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{
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ret = subprocess_create_ex(commandLineCstr.
data
(),
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0, environmentCstr.
data
(), this->process);
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}
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else
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{
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ret = subprocess_create(commandLineCstr.
data
(),
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subprocess_option_inherit_environment,
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this->process);
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}
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if
(0 != ret)
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{
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std::cerr
<<
"failed to create subprocess"
<<
std::endl
;
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delete
this->
process
;
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this->
process
=
nullptr
;
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}
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}
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public
:
~Subprocess
()
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{
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if
(this->
process
!=
nullptr
)
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subprocess_destroy(this->
process
);
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delete
this->
process
;
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}
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public
:
std::string
Stdout
()
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{
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std::string
result;
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if
(this->
process
!=
nullptr
)
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{
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auto
*p_stdout = subprocess_stdout(this->
process
);
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char
buffer[128];
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while
(!feof(p_stdout))
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{
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if
(fgets(buffer, 128, p_stdout) !=
nullptr
)
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result += buffer;
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}
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}
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return
result;
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}
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public
:
std::string
Stderr
()
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{
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std::string
result;
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if
(this->
process
!=
nullptr
)
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{
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auto
*p_stdout = subprocess_stderr(this->
process
);
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char
buffer[128];
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while
(!feof(p_stdout))
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{
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if
(fgets(buffer, 128, p_stdout) !=
nullptr
)
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result += buffer;
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}
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}
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return
result;
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}
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public
:
bool
Alive
()
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{
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if
(this->
process
!=
nullptr
)
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return
subprocess_alive(this->
process
);
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else
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return
false
;
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}
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public
:
bool
Terminate
()
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{
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if
(this->
process
!=
nullptr
)
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return
subprocess_terminate(this->
process
) != 0;
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else
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return
false
;
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}
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public
:
int
Join
()
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{
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int
return_code = -1;
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if
(this->
process
!=
nullptr
)
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{
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auto
ret = subprocess_join(this->
process
, &return_code);
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if
(ret != 0)
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{
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std::cerr
<<
"Failed to join subprocess"
<<
std::endl
;
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}
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}
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return
return_code;
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}
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protected
:
std::vector<std::string>
commandLine
;
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protected
:
EnvironmentMap
environment
;
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protected
:
bool
inheritEnvironment
;
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protected
: subprocess_s *
process
{
nullptr
};
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};
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}
// namespace utils
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}
// namespace gz
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#endif
// GZ_UTILS__SUBPROCESS_HH_