Method dup

extlibs/fmt/src/os.cc:247–254

}

file file::dup(int fd) {
  // Don't retry as dup doesn't return EINTR.
  // http://pubs.opengroup.org/onlinepubs/009695399/functions/dup.html
  int new_fd = FMT_POSIX_CALL(dup(fd));
  if (new_fd == -1)
    FMT_THROW(system_error(errno, "cannot duplicate file descriptor {}", fd));
  return file(new_fd);
}

void file::dup2(int fd) {
  int result = 0;