Function exec

include/util/command.hpp:124–131

}

inline struct res exec(const std::string& cmd, const std::string& output_name) {
  int pid;
  auto fp = command::open(cmd, pid, output_name);
  if (!fp) return {-1, ""};
  auto output = command::read(fp);
  auto stat = command::close(fp, pid);
  return {WEXITSTATUS(stat), output};
}

inline struct res execNoRead(const std::string& cmd) {
  int pid;