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#include "ProcessLinux.hpp"
namespace uciadapter {
ProcessLinux::ProcessLinux() {
pipe(in_fd);
pipe(out_fd);
}
void ProcessLinux::Kill() { kill(pid, SIGTERM); }
void ProcessLinux::Start(std::string path) {
pid = fork();
if (pid == 0) {
// Connect output of child process
close(out_fd[0]);
dup2(out_fd[1], STDOUT_FILENO);
close(out_fd[1]);
// Connect input of child process
close(in_fd[1]);
dup2(in_fd[0], STDIN_FILENO);
close(in_fd[0]);
const char *args[] = {path.c_str(), NULL};
execvp(args[0], const_cast<char *const *>(args));
_exit(1);
} else if (pid < 0) {
throw FailedToStartEngine();
}
// Parent do not read the in of the child
close(in_fd[0]);
// The parent do not write on the out of the child
close(out_fd[1]);
// Set descriptor to non-blocking (for the read syscall)
int flags = fcntl(out_fd[0], F_GETFL, 0);
fcntl(out_fd[0], F_SETFL, flags | O_NONBLOCK);
}
std::string ProcessLinux::ReadLine() {
std::string line;
auto start = std::chrono::system_clock::now();
// Read char by char
while (true) {
char c;
int status = read(out_fd[0], &c, 1);
if (status > 0) {
line += c;
if (c == '\n')
break;
} else {
// Check for timeout
auto end = std::chrono::system_clock::now();
auto elapsed =
std::chrono::duration_cast<std::chrono::seconds>(end - start);
if (elapsed.count() > ENGINE_TIMEOUT) {
throw ReadTimeoutExpire();
}
}
}
return (std::string(line));
}
void ProcessLinux::Write(std::string data) {
for (unsigned int i = 0; i < data.size(); i++) {
buffer[i] = data[i];
}
write(in_fd[1], buffer, data.size());
}
} // namespace uciadapter
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