exec.cpp
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/*
* Copyright © 2013 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authored by: Thomas Voß <thomas.voss@canonical.com>
*/
#include <core/posix/exec.h>
#include <core/posix/fork.h>
#include <core/posix/standard_stream.h>
#include <iostream>
#include <cstring>
#include <unistd.h>
namespace core
{
namespace posix
{
ChildProcess exec(const std::string& fn,
const std::vector<std::string>& argv,
const std::map<std::string, std::string>& env,
const StandardStream& flags)
{
std::function<void()> null_function = [](){};
return exec(fn, argv, env, flags, null_function);
}
ChildProcess exec(const std::string& fn,
const std::vector<std::string>& argv,
const std::map<std::string, std::string>& env,
const StandardStream& flags,
const std::function<void()>& child_setup)
{
return posix::fork([fn, argv, env, child_setup]()
{
char** it; char** pargv; char** penv;
it = pargv = new char*[argv.size()+2];
*it = ::strdup(fn.c_str());
it++;
for (auto element : argv)
{
*it = ::strdup(element.c_str());
it++;
}
*it = nullptr;
it = penv = new char*[env.size()+1];
for (auto pair : env)
{
*it = ::strdup((pair.first + "=" + pair.second).c_str());
it++;
}
*it = nullptr;
child_setup();
return static_cast<posix::exit::Status>(execve(fn.c_str(), pargv, penv));
}, flags);
}
}
}
core::posix::ChildProcess
The Process class models a child process of this process.
Definition child_process.h:44
exec.h
fork.h
core::posix::exit::Status
Status
The Status enum wrap's the posix exit status.
Definition exit.h:34
core::posix
Definition child_process.h:34
core::posix::fork
CORE_POSIX_DLL_PUBLIC ChildProcess fork(const std::function< posix::exit::Status()> &main, const StandardStream &flags)
fork forks a new process and executes the provided main function in the newly forked process.
Definition fork.cpp:57
core::posix::StandardStream
StandardStream
The StandardStream enum wraps the POSIX standard streams.
Definition standard_stream.h:39
core::posix::exec
CORE_POSIX_DLL_PUBLIC ChildProcess exec(const std::string &fn, const std::vector< std::string > &argv, const std::map< std::string, std::string > &env, const StandardStream &flags)
exec execve's the executable with the provided arguments and environment.
Definition exec.cpp:33
core
Definition child_process.h:32
standard_stream.h