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#include "process.hpp"
#include <cstdlib>
#include <unistd.h>
#include <signal.h>
#include <stdexcept>
namespace TinyProcessLib {
Process::Data::Data() noexcept : id(-1) {}
Process::Process(std::function<void()> function,
std::function<void (const char *, size_t)> read_stdout,
std::function<void (const char *, size_t)> read_stderr,
bool open_stdin, size_t buffer_size) noexcept :
closed(true), read_stdout(std::move(read_stdout)), read_stderr(std::move(read_stderr)), open_stdin(open_stdin), buffer_size(buffer_size) {
open(function);
async_read();
}
Process::id_type Process::open(std::function<void()> function) noexcept {
if(open_stdin)
stdin_fd=std::unique_ptr<fd_type>(new fd_type);
if(read_stdout)
stdout_fd=std::unique_ptr<fd_type>(new fd_type);
if(read_stderr)
stderr_fd=std::unique_ptr<fd_type>(new fd_type);
int stdin_p[2], stdout_p[2], stderr_p[2];
if(stdin_fd && pipe(stdin_p)!=0)
return -1;
if(stdout_fd && pipe(stdout_p)!=0) {
if(stdin_fd) {close(stdin_p[0]);close(stdin_p[1]);}
return -1;
}
if(stderr_fd && pipe(stderr_p)!=0) {
if(stdin_fd) {close(stdin_p[0]);close(stdin_p[1]);}
if(stdout_fd) {close(stdout_p[0]);close(stdout_p[1]);}
return -1;
}
id_type pid = fork();
if (pid < 0) {
if(stdin_fd) {close(stdin_p[0]);close(stdin_p[1]);}
if(stdout_fd) {close(stdout_p[0]);close(stdout_p[1]);}
if(stderr_fd) {close(stderr_p[0]);close(stderr_p[1]);}
return pid;
}
else if (pid == 0) {
if(stdin_fd) dup2(stdin_p[0], 0);
if(stdout_fd) dup2(stdout_p[1], 1);
if(stderr_fd) dup2(stderr_p[1], 2);
if(stdin_fd) {close(stdin_p[0]);close(stdin_p[1]);}
if(stdout_fd) {close(stdout_p[0]);close(stdout_p[1]);}
if(stderr_fd) {close(stderr_p[0]);close(stderr_p[1]);}
//Based on http://stackoverflow.com/a/899533/3808293
int fd_max=static_cast<int>(sysconf(_SC_OPEN_MAX)); // truncation is safe
for(int fd=3;fd<fd_max;fd++)
close(fd);
setpgid(0, 0);
//TODO: See here on how to emulate tty for colors: http://stackoverflow.com/questions/1401002/trick-an-application-into-thinking-its-stdin-is-interactive-not-a-pipe
//TODO: One solution is: echo "command;exit"|script -q /dev/null
if(function)
function();
_exit(EXIT_FAILURE);
}
if(stdin_fd) close(stdin_p[0]);
if(stdout_fd) close(stdout_p[1]);
if(stderr_fd) close(stderr_p[1]);
if(stdin_fd) *stdin_fd = stdin_p[1];
if(stdout_fd) *stdout_fd = stdout_p[0];
if(stderr_fd) *stderr_fd = stderr_p[0];
closed=false;
data.id=pid;
return pid;
}
Process::id_type Process::open(const std::string &command, const std::string &path) noexcept {
return open([&command, &path] {
if(!path.empty()) {
auto path_escaped=path;
size_t pos=0;
//Based on https://www.reddit.com/r/cpp/comments/3vpjqg/a_new_platform_independent_process_library_for_c11/cxsxyb7
while((pos=path_escaped.find('\'', pos))!=std::string::npos) {
path_escaped.replace(pos, 1, "'\\''");
pos+=4;
}
execl("/bin/sh", "sh", "-c", ("cd '"+path_escaped+"' && "+command).c_str(), NULL);
}
else
execl("/bin/sh", "sh", "-c", command.c_str(), NULL);
});
}
void Process::async_read() noexcept {
if(data.id<=0)
return;
if(stdout_fd) {
stdout_thread=std::thread([this](){
auto buffer = std::unique_ptr<char[]>( new char[buffer_size] );
ssize_t n;
while ((n=read(*stdout_fd, buffer.get(), buffer_size)) > 0)
read_stdout(buffer.get(), static_cast<size_t>(n));
});
}
if(stderr_fd) {
stderr_thread=std::thread([this](){
auto buffer = std::unique_ptr<char[]>( new char[buffer_size] );
ssize_t n;
while ((n=read(*stderr_fd, buffer.get(), buffer_size)) > 0)
read_stderr(buffer.get(), static_cast<size_t>(n));
});
}
}
int Process::get_exit_status() noexcept {
if(data.id<=0)
return -1;
int exit_status;
waitpid(data.id, &exit_status, 0);
{
std::lock_guard<std::mutex> lock(close_mutex);
closed=true;
}
close_fds();
if(exit_status>=256)
exit_status=exit_status>>8;
return exit_status;
}
bool Process::try_get_exit_status(int &exit_status) noexcept {
if(data.id<=0)
return false;
id_type p = waitpid(data.id, &exit_status, WNOHANG);
if (p == 0)
return false;
{
std::lock_guard<std::mutex> lock(close_mutex);
closed=true;
}
close_fds();
if(exit_status>=256)
exit_status=exit_status>>8;
return true;
}
void Process::close_fds() noexcept {
if(stdout_thread.joinable())
stdout_thread.join();
if(stderr_thread.joinable())
stderr_thread.join();
if(stdin_fd)
close_stdin();
if(stdout_fd) {
if(data.id>0)
close(*stdout_fd);
stdout_fd.reset();
}
if(stderr_fd) {
if(data.id>0)
close(*stderr_fd);
stderr_fd.reset();
}
}
bool Process::write(const char *bytes, size_t n) {
if(!open_stdin)
throw std::invalid_argument("Can't write to an unopened stdin pipe. Please set open_stdin=true when constructing the process.");
std::lock_guard<std::mutex> lock(stdin_mutex);
if(stdin_fd) {
if(::write(*stdin_fd, bytes, n)>=0) {
return true;
}
else {
return false;
}
}
return false;
}
void Process::close_stdin() noexcept {
std::lock_guard<std::mutex> lock(stdin_mutex);
if(stdin_fd) {
if(data.id>0)
close(*stdin_fd);
stdin_fd.reset();
}
}
void Process::kill(bool force) noexcept {
std::lock_guard<std::mutex> lock(close_mutex);
if(data.id>0 && !closed) {
if(force)
::kill(-data.id, SIGTERM);
else
::kill(-data.id, SIGINT);
}
}
void Process::kill(id_type id, bool force) noexcept {
if(id<=0)
return;
if(force)
::kill(-id, SIGTERM);
else
::kill(-id, SIGINT);
}
} // TinyProsessLib