Function cloexec

src/posix/subprocess.hpp:186–210

This function will invoke `os::cloexec` on all specified file descriptors that are valid (i.e., not `None` and >= 0).

// This function will invoke `os::cloexec` on all specified file
// descriptors that are valid (i.e., not `None` and >= 0).
inline Try<Nothing> cloexec(
    const InputFileDescriptors& stdinfds,
    const OutputFileDescriptors& stdoutfds,
    const OutputFileDescriptors& stderrfds)
{
  hashset<int> fds = {
    stdinfds.read,
    stdinfds.write.getOrElse(-1),
    stdoutfds.read.getOrElse(-1),
    stdoutfds.write,
    stderrfds.read.getOrElse(-1),
    stderrfds.write
  };

  foreach (int fd, fds) {
    if (fd >= 0) {
      Try<Nothing> cloexec = os::cloexec(fd);
      if (cloexec.isError()) {
        return Error(cloexec.error());
      }
    }
  }

  return Nothing();
}


// The main entry of the child process.