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// -*- c++ -*-
// Distributed under the BSD 2-Clause License.
// See accompanying file LICENSE for details.
#include "execute.h"
#include <cstring>
#if !defined(_WIN32)
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <spawn.h>
#else
#include <processthreadsapi.h>
#include <synchapi.h>
#include <processenv.h>
#endif
#include <iostream>
/*
https://blog.famzah.net/2009/11/20/a-much-faster-popen-and-system-implementation-for-linux/
https://github.com/famzah/popen-noshell/commit/1f9eaf4eeef348d1efe0f3c7fe8ab670653cfbb1
https://blog.famzah.net/2018/12/19/posix_spawn-performance-benchmarks-and-usage-examples/
https://stackoverflow.com/questions/4259629/what-is-the-difference-between-fork-and-vfork/5207945#5207945
*/
#if !defined(_WIN32)
namespace
{
int parent_waitpid(pid_t pid)
{
int status;
if(waitpid(pid, &status, 0) != pid)
{
return 1;
}
return WEXITSTATUS(status);
}
} // namespace ::
#endif
int execute(const std::string& command,
const std::vector<std::string>& args,
const std::map<std::string, std::string>& env,
bool verbose, bool terminate)
{
std::vector<const char*> argv;
argv.push_back(command.data());
for(const auto& arg : args)
{
argv.push_back(arg.data());
}
argv.push_back(nullptr);
std::string cmd;
for(const auto& arg : argv)
{
if(arg == nullptr)
{
break;
}
if(!cmd.empty())
{
cmd += " ";
}
cmd += arg;
}
if(verbose)
{
std::cout << cmd << "\n";
}
#if !defined(_WIN32)
#if 1
auto pid = vfork();
if(pid == 0)
{
for(const auto& [key, value] : env)
{
setenv(key, value);
}
// TODO: use execvpe to set LD_LIBRARY_PATH
execv(command.data(), (char**)argv.data());
std::cout << "Could not execute " << command << ": " <<
strerror(errno) << "\n";
_exit(1); // execv only returns if an error occurred
}
return parent_waitpid(pid);
#elif 0
pid_t pid;
const char * envp[] = {nullptr}; // TODO: use this to set LD_LIBRARY_PATH
if(posix_spawn(&pid, command.data(), nullptr, nullptr,
(char**)argv.data(), envp))
{
return 1;
}
return parent_waitpid(pid);
#else
return system(cmd.data());
#endif
#else
std::map<std::string, std::string> new_env;
auto env_strings = GetEnvironmentStrings();
const char* ptr = env_strings;
std::string key;
std::string value;
bool key_state{true};
while(true)
{
if(key_state) // searching for key
{
if(*ptr == '\0')
{
break;
}
if(*ptr != '=')
{
key += *ptr;
}
else
{
key_state = false;
}
}
else
{
if(*ptr != '\0')
{
value += *ptr;
}
else
{
new_env.insert({key, value});
key = {};
value = {};
key_state = true;
}
}
++ptr;
}
FreeEnvironmentStrings(env_strings);
// add new env vars (if any)
for(const auto& [key, value] : env)
{
//if(key == "CL" || key == "LINK" || key == "LIB")
{
new_env[key] = value;
}
}
std::string env_str;
for(const auto& [k,v] : new_env)
{
env_str += k + "=" + v;
env_str += '\0';
}
env_str += '\0';
STARTUPINFO si;
PROCESS_INFORMATION pi;
ZeroMemory(&si,sizeof(si));
si.cb=sizeof(si);
ZeroMemory(&pi,sizeof(pi));
// TODO: Use SetDllDirectory(...) to set DLL search directory
if(!CreateProcess(nullptr, //"C:/WINDOWS/notepad.exe",
//"notepad.exe c:/readme.txt",0,0,0,0,0,0,&si,&pi))
(char*)cmd.data(),0,0,0,0,env_str.data(),0,&si,&pi))
{
return 1; // Could not start process;
}
if(terminate)
{
ExitProcess(0);
}
// Now 'pi.hProcess' contains the process HANDLE, which you can use to
// wait for it like this:
const DWORD infinite = 0xFFFFFFFF;
WaitForSingleObject(pi.hProcess, infinite);
DWORD exitCode{0};
GetExitCodeProcess(pi.hProcess, &exitCode);
return exitCode;
#endif
}
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