Class output

cpp-subprocess/subprocess.hpp:946–966

! * Option to specify the output channel for the child * process. It can be: * 1. An already open file descriptor. * 2. A file name. * 3. IOTYPE. Usually a PIPE. * * Eg: output{PIPE} * OR output{"output.txt"} */

 * OR output{"output.txt"}
 */
struct output
{
  explicit output(int fd): wr_ch_(fd) {}

  explicit output (FILE* fp):output(subprocess_fileno(fp)) { assert(fp); }

  explicit output(const char* filename) {
    int fd = subprocess_open(filename, O_APPEND | O_CREAT | O_RDWR, 0640);
    if (fd == -1) throw OSError("File not found: ", errno);
    wr_ch_ = fd;
  }
  explicit output(IOTYPE typ) {
    assert (typ == PIPE && "STDOUT/STDERR not allowed");
#ifndef __USING_WINDOWS__
    std::tie(rd_ch_, wr_ch_) = util::pipe_cloexec();
#endif
  }

  int rd_ch_ = -1;
  int wr_ch_ = -1;
};


/*!